1
|
Yu JW, Pang R, Liu B, Zhang L, Kong LY. Development and validation of a nomogram model for predicting distant metastasis of aged ≥50 patients with thyroid carcinoma: a SEER database analysis. Eur Rev Med Pharmacol Sci 2024; 28:2351-2362. [PMID: 38567598 DOI: 10.26355/eurrev_202403_35742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
OBJECTIVE This work aimed to construct and validate a model for predicting distant metastasis (DM) in thyroid carcinoma (TC) patients aged≥50. PATIENTS AND METHODS The research data were collected from the Surveillance, Epidemiology, and End Results (SEER) program databases via SEER*Stat software (https://seer.cancer.gov/). Logistics regression was used to screen the independent risk factors for TC patients. The nomogram was constructed and validated based on the logistics regression results for predicting DM occurrence in TC patients. Moreover, the characteristic curves (ROC) were used to assess the predictive performance. The decision analysis curve (DCA) and the calibration curve were used to test this nomogram's accuracy and discrimination. Additionally, we analyzed survival and risk scores in TC patients with metastasis using the Kaplan-Meier (KM) method. RESULTS A total of 11,166 TC patients were divided into a training set and a validation set. The results showed that topography (T), lymph node metastasis (N), and (grade) G were crucial risk factors for predicting DM. ROC analysis showed that the model had a good discriminative ability both in the training and validation set. The DCA curve showed greater net benefits across a range of DM risks for the nomogram in the training and validation set. Survival analyses showed that the metastasis cases with low-risk scores have shown a poorer prognosis in this study, both in the training and validation set. CONCLUSIONS The nomogram model had excellent predictive performance and net benefit for predicting DM of TC patients aged ≥50. The model can help doctors develop treatment plans for their patients.
Collapse
Affiliation(s)
- J-W Yu
- Department of Head and Neck Thyroid, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang, China.
| | | | | | | | | |
Collapse
|
2
|
Rodriguez-Sibaja MJ, Villar J, Ohuma EO, Napolitano R, Heyl S, Carvalho M, Jaffer YA, Noble JA, Oberto M, Purwar M, Pang R, Cheikh Ismail L, Lambert A, Gravett MG, Salomon LJ, Drukker L, Barros FC, Kennedy SH, Bhutta ZA, Papageorghiou AT. Fetal cerebellar growth and Sylvian fissure maturation: international standards from Fetal Growth Longitudinal Study of INTERGROWTH-21 st Project. Ultrasound Obstet Gynecol 2021; 57:614-623. [PMID: 32196791 DOI: 10.1002/uog.22017] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 02/26/2020] [Accepted: 03/07/2020] [Indexed: 06/10/2023]
Abstract
OBJECTIVE To construct international ultrasound-based standards for fetal cerebellar growth and Sylvian fissure maturation. METHODS Healthy, well nourished pregnant women, enrolled at < 14 weeks' gestation in the Fetal Growth Longitudinal Study (FGLS) of INTERGROWTH-21st , an international multicenter, population-based project, underwent serial three-dimensional (3D) fetal ultrasound scans every 5 ± 1 weeks until delivery in study sites located in Brazil, India, Italy, Kenya and the UK. In the present analysis, only those fetuses that underwent developmental assessment at 2 years of age were included. We measured the transcerebellar diameter and assessed Sylvian fissure maturation using two-dimensional ultrasound images extracted from available 3D fetal head volumes. The appropriateness of pooling data from the five sites was assessed using variance component analysis and standardized site differences. For each Sylvian fissure maturation score (left or right side), mean gestational age and 95% CI were calculated. Transcerebellar diameter was modeled using fractional polynomial regression, and goodness of fit was assessed. RESULTS Of those children in the original FGLS cohort who had developmental assessment at 2 years of age, 1130 also had an available 3D ultrasound fetal head volume. The sociodemographic characteristics and pregnancy/perinatal outcomes of the study sample confirmed the health and low-risk status of the population studied. In addition, the fetuses had low morbidity and adequate growth and development at 2 years of age. In total, 3016 and 2359 individual volumes were available for transcerebellar-diameter and Sylvian-fissure analysis, respectively. Variance component analysis and standardized site differences showed that the five study populations were sufficiently similar on the basis of predefined criteria for the data to be pooled to produce international standards. A second-degree fractional polynomial provided the best fit for modeling transcerebellar diameter; we then estimated gestational-age-specific 3rd , 50th and 97th smoothed centiles. Goodness-of-fit analysis comparing empirical centiles with smoothed centile curves showed good agreement. The Sylvian fissure increased in maturation with advancing gestation, with complete overlap of the mean gestational age and 95% CIs between the sexes for each development score. No differences in Sylvian fissure maturation between the right and left hemispheres were observed. CONCLUSION We present, for the first time, international standards for fetal cerebellar growth and Sylvian fissure maturation throughout pregnancy based on a healthy fetal population that exhibited adequate growth and development at 2 years of age. © 2020 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.
Collapse
Affiliation(s)
- M J Rodriguez-Sibaja
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
- Maternal-Fetal Medicine Department, National Institute of Perinatology, Mexico City, Mexico
| | - J Villar
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - E O Ohuma
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
- Centre for Statistics in Medicine, Botnar Research Centre, University of Oxford, Oxford, UK
| | - R Napolitano
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
| | - S Heyl
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
| | - M Carvalho
- Faculty of Health Sciences, Aga Khan University, Nairobi, Kenya
| | - Y A Jaffer
- Department of Family & Community Health, Ministry of Health, Muscat, Sultanate of Oman
| | - J A Noble
- Department of Engineering Science, Institute of Biomedical Engineering, University of Oxford, Oxford, UK
| | - M Oberto
- S.C. Ostetricia 2U, Città della Salute e della Scienza di Torino, Turin, Italy
| | - M Purwar
- Nagpur INTERGROWTH-21st Research Centre, Ketkar Hospital, Nagpur, India
| | - R Pang
- School of Public Health, Peking University, Beijing, China
| | - L Cheikh Ismail
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Clinical Nutrition and Dietetics Department, University of Sharjah, Sharjah, United Arab Emirates
| | - A Lambert
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - M G Gravett
- Departments of Obstetrics & Gynecology and of Public Health, University of Washington, Seattle, WA, USA
| | - L J Salomon
- Department of Obstetrics and Fetal Medicine, Hôpital Necker Enfants Malades, Université Paris Descartes, Paris, France
| | - L Drukker
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - F C Barros
- Programa de Pós-Graduação em Saúde e Comportamento, Universidade Católica de Pelotas, Pelotas, Brazil
| | - S H Kennedy
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - Z A Bhutta
- Center for Global Child Health, Hospital for Sick Children, Toronto, Canada
| | - A T Papageorghiou
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| |
Collapse
|
3
|
Napolitano R, Molloholli M, Donadono V, Ohuma EO, Wanyonyi SZ, Kemp B, Yaqub MK, Ash S, Barros FC, Carvalho M, Jaffer YA, Noble JA, Oberto M, Purwar M, Pang R, Cheikh Ismail L, Lambert A, Gravett MG, Salomon LJ, Bhutta ZA, Kennedy SH, Villar J, Papageorghiou AT. International standards for fetal brain structures based on serial ultrasound measurements from Fetal Growth Longitudinal Study of INTERGROWTH-21 st Project. Ultrasound Obstet Gynecol 2020; 56:359-370. [PMID: 32048426 DOI: 10.1002/uog.21990] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 01/27/2020] [Accepted: 01/27/2020] [Indexed: 06/10/2023]
Abstract
OBJECTIVE To create prescriptive growth standards for five fetal brain structures, measured using ultrasound, in healthy, well-nourished women at low risk of impaired fetal growth and poor perinatal outcome, taking part in the Fetal Growth Longitudinal Study (FGLS) of the INTERGROWTH-21st Project. METHODS This was a complementary analysis of a large, population-based, multicenter, longitudinal study. The sample analyzed was selected randomly from the overall FGLS population, ensuring an equal distribution among the eight diverse participating sites and of three-dimensional (3D) ultrasound volumes across pregnancy (range: 15-36 weeks' gestation). We measured, in planes reconstructed from 3D ultrasound volumes of the fetal head at different timepoints in pregnancy, the size of the parieto-occipital fissure (POF), Sylvian fissure (SF), anterior horn of the lateral ventricle, atrium of the posterior horn of the lateral ventricle (PV) and cisterna magna (CM). Fractional polynomials were used to construct the standards. Growth and development of the infants were assessed at 1 and 2 years of age to confirm their adequacy for constructing international standards. RESULTS From the entire FGLS cohort of 4321 women, 451 (10.4%) were selected at random. After exclusions, 3D ultrasound volumes from 442 fetuses born without a congenital malformation were used to create the charts. The fetal brain structures of interest were identified in 90% of cases. All structures, except the PV, showed increasing size with gestational age, and the size of the POF, SF, PV and CM showed increasing variability. The 3rd , 5th , 50th , 95th and 97th smoothed centiles are presented. The 5th centiles for the POF and SF were 3.1 mm and 4.7 mm at 22 weeks' gestation and 4.6 mm and 9.9 mm at 32 weeks, respectively. The 95th centiles for the PV and CM were 8.5 mm and 7.5 mm at 22 weeks and 8.6 mm and 9.5 mm at 32 weeks, respectively. CONCLUSIONS We have produced prescriptive size standards for fetal brain structures based on prospectively enrolled pregnancies at low risk of abnormal outcome. We recommend these as international standards for the assessment of measurements obtained using ultrasound from fetal brain structures. © 2020 Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.
Collapse
Affiliation(s)
- R Napolitano
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
| | - M Molloholli
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
| | - V Donadono
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
| | - E O Ohuma
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
- Centre for Statistics in Medicine, Botnar Research Centre, University of Oxford, Oxford, UK
| | - S Z Wanyonyi
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
| | - B Kemp
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
| | - M K Yaqub
- Department of Engineering Science, Institute of Biomedical Engineering, University of Oxford, Oxford, UK
| | - S Ash
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
| | - F C Barros
- Programa de Pós-Graduação em Saúde e Comportamento, Universidade Católica de Pelotas, Pelotas, Brazil
| | - M Carvalho
- Faculty of Health Sciences, Aga Khan University, Nairobi, Kenya
| | - Y A Jaffer
- Department of Family & Community Health, Ministry of Health, Muscat, Sultanate of Oman
| | - J A Noble
- Department of Engineering Science, Institute of Biomedical Engineering, University of Oxford, Oxford, UK
| | - M Oberto
- S.C. Ostetricia 2U, Città della Salute e della Scienza di Torino, Italy
| | - M Purwar
- Nagpur INTERGROWTH-21st Research Centre, Ketkar Hospital, Nagpur, India
| | - R Pang
- School of Public Health, Peking University, Beijing, China
| | - L Cheikh Ismail
- Clinical Nutrition and Dietetics Department, University of Sharjah, Sharjah, United Arab Emirates
| | - A Lambert
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
| | - M G Gravett
- Departments of Obstetrics and Gynecology, and of Public Health, University of Washington, Seattle, WA, USA
| | - L J Salomon
- Department of Obstetrics and Fetal Medicine, Hôpital Necker Enfants Malades, Université Paris Descartes, Paris, France
| | - Z A Bhutta
- Center for Global Child Health, Hospital for Sick Children, Toronto, Canada
| | - S H Kennedy
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - J Villar
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - A T Papageorghiou
- Nuffield Department of Women's & Reproductive Health, University of Oxford, Oxford, UK
- Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| |
Collapse
|
4
|
Chen J, Li T, Pang R. miR-2703 regulates the chitin biosynthesis pathway by targeting chitin synthase 1a in Nilaparvata lugens. Insect Mol Biol 2020; 29:38-47. [PMID: 31260146 DOI: 10.1111/imb.12606] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 06/25/2019] [Accepted: 06/26/2019] [Indexed: 06/09/2023]
Abstract
The chitin biosynthesis pathway is an important physiology process in arthropods. However, few microRNAs (miRNAs) involved in the regulation of the chitin biosynthesis pathway in insects have been reported until now. In this study, four groups of samples that either upregulated or downregulated the chitin biosynthesis pathway were collected for deep sequencing, and a total of 15 unique mature miRNAs with significantly different expression levels were found, including 11 known miRNAs and four novel miRNAs. Subsequently, we showed that miR-2703 and its new target gene chitin synthase 1a are important for ecdysone-induced chitin biosynthesis in Nilaparvata lugens, a serious insect pest of rice. The nymphs showed an obvious moulting defect phenotype, lower survival rate and significantly reduced chitin content after miR-2703 feeding or injection. Furthermore, we found that the transcription level of miR-2703 was not repressed by 20-hydroxyecdysone signalling after Broad-Complex (BR-C) double-stranded RNA (dsRNA) injection compared with the repressed levels after green fluorescent protein dsRNA injection, suggesting that the involvement of miR-2703 in the 20-hydroxyecdysone pathway contributes to BR-C activity. miR-2703 regulates the chitin biosynthesis pathway by targeting chitin synthase 1a in response to 20-hydroxyecdysone signalling.
Collapse
Affiliation(s)
- J Chen
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - T Li
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - R Pang
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China
| |
Collapse
|
5
|
Ng L, Kwan V, Chow A, Yau TCC, Poon RTP, Pang R, Law WL. Overexpression of Pin1 and rho signaling partners correlates with metastatic behavior and poor recurrence-free survival of hepatocellular carcinoma patients. BMC Cancer 2019; 19:713. [PMID: 31324164 PMCID: PMC6642482 DOI: 10.1186/s12885-019-5919-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Accepted: 07/10/2019] [Indexed: 02/07/2023] Open
Abstract
Background Identification of molecular markers for early detection or prediction of metastasis is crucial for both management of HCC patient postoperative treatment and identify new therapeutic targets to inhibit HCC progression and metastasis. In the current study, we investigated the clinical correlation between Pin1, RhoA and RhoC and their association with HCC metastasis. Methods Using a randomized study design of primary HCC samples from 139 patients, we determined messenger RNA expression of Pin1, RhoA and RhoC and their prognostic value. Results Our findings demonstrated for the first time the clinical correlation of Pin1 in HCC metastasis. Pin1, RhoA and RhoC transcript levels were significantly higher in HCC specimens when compared with the paired adjacent non-tumorous liver. Pin1 overexpression was closely correlated with that of RhoA (R = 0.562, p < 0.001) and RhoC (R = 0.529, p < 0.001), and their co-overexpressions correlated with metastatic HCC (p = 0.000012) and poor recurrence-free survival of HCC patients (p < 0.00001), which showed better prognostic significance than either Pin1, RhoA or RhoC overexpression alone. Co-overexpressions of Pin1 + RhoA/RhoC were also an independent factor for predicting development of metastasis after curative resection in our multivariate regression model (p < 0.001). Conclusion Pin1, RhoA and RhoC co-overexpressions are prognostic factor for metastatic HCC and predict poor recurrence-free survival. Electronic supplementary material The online version of this article (10.1186/s12885-019-5919-3) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Lui Ng
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong
| | - Virginia Kwan
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong
| | - Ariel Chow
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong.,Centre for Cancer Research, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong
| | - Thomas Chung-Cheung Yau
- Department of Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong
| | - Ronnie Tung-Ping Poon
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong.,Centre for Cancer Research, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong
| | - Roberta Pang
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong. .,Centre for Cancer Research, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong.
| | - Wai-Lun Law
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong
| |
Collapse
|
6
|
Cavallaro A, Ash ST, Napolitano R, Wanyonyi S, Ohuma EO, Molloholli M, Sande J, Sarris I, Ioannou C, Norris T, Donadono V, Carvalho M, Purwar M, Barros FC, Jaffer YA, Bertino E, Pang R, Gravett MG, Salomon LJ, Noble JA, Altman DG, Papageorghiou AT. Quality control of ultrasound for fetal biometry: results from the INTERGROWTH-21 st Project. Ultrasound Obstet Gynecol 2018; 52:332-339. [PMID: 28718938 DOI: 10.1002/uog.18811] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Revised: 07/01/2017] [Accepted: 07/05/2017] [Indexed: 06/07/2023]
Abstract
OBJECTIVE To assess a comprehensive package of ultrasound quality control in the Fetal Growth Longitudinal Study of the INTERGROWTH-21st Project, a large multicenter study of fetal growth. METHODS Quality control (QC) measures were performed for 20 313 ultrasound scan images obtained prospectively from 4321 fetuses at 14-41 weeks' gestation in eight geographical locations. At the time of each ultrasound examination, three fetal biometric variables (head circumference (HC), abdominal circumference (AC) and femur length (FL)) were measured in triplicate on separately generated images. All measurements were taken in a blinded fashion. QC had two elements: (1) qualitative QC: visual assessment by sonographers at each study site of their images based on specific criteria, with 10% of images being re-assessed at the Oxford-based Ultrasound Quality Unit (compared using an adjusted kappa statistic); and (2) quantitative QC: assessment of measurement data by comparing the first, second and third measurements (intraobserver variability), remeasurement of caliper replacement in 10% (interobserver variability), both by Bland-Altman plots and plotting frequency histograms of the SD of triplicate measurements and assessing how many were above or below 2 SD of the expected distribution. The system allowed the sonographers' performances to be monitored regularly. RESULTS A high level of agreement between self- and external scoring was demonstrated for all measurements (κ = 0.99 (95% CI, 0.98-0.99) for HC, 0.98 (95% CI, 0.97-0.99) for AC and 0.96 (95% CI, 0.95-0.98) for FL). Intraobserver 95% limits of agreement (LoA) of ultrasound measures for HC, AC and FL were ± 3.3%, ± 5.6% and ± 6.2%, respectively; the corresponding values for interobserver LoA were ± 4.4%, ± 6.0% and ± 5.6%. The SD distribution of triplicate measurements for all biometric variables showed excessive variability for three of 31 sonographers, allowing prompt identification and retraining. CONCLUSIONS Qualitative and quantitative QC monitoring was feasible and highly reproducible in a large multicenter research study, which facilitated the production of high-quality ultrasound images. We recommend that the QC system we developed is implemented in future research studies and clinical practice. Copyright © 2017 ISUOG. Published by John Wiley & Sons Ltd.
Collapse
Affiliation(s)
- A Cavallaro
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - S T Ash
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - R Napolitano
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - S Wanyonyi
- Faculty of Health Sciences, Aga Khan University, Nairobi, Kenya
| | - E O Ohuma
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
- Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - M Molloholli
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - J Sande
- Faculty of Health Sciences, Aga Khan University, Nairobi, Kenya
| | - I Sarris
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - C Ioannou
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - T Norris
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - V Donadono
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - M Carvalho
- Faculty of Health Sciences, Aga Khan University, Nairobi, Kenya
| | - M Purwar
- Nagpur INTERGROWTH-21st Research Centre, Ketkar Hospital, Nagpur, India
| | - F C Barros
- Programa de Pós-Graduação em Epidemiologia, Universidade Federal de Pelotas, Pelotas, RS, Brazil
- Programa de Pós-Graduação em Saúde e Comportamento, Universidade Católica de Pelotas, Pelotas, RS, Brazil
| | - Y A Jaffer
- Department of Family & Community Health, Ministry of Health, Muscat, Sultanate of Oman
| | - E Bertino
- Dipartimento di Scienze Pediatriche e dell'Adolescenza, Cattedra di Neonatologia, Università degli Studi di Torino, Torino, Italy
| | - R Pang
- School of Public Health, Peking University, Beijing, China
| | - M G Gravett
- Global Alliance to Prevent Prematurity and Stillbirth (GAPPS), Seattle, WA, USA
| | - L J Salomon
- Maternité Necker-Enfants Malades, AP-HP, Université Paris Descartes, Paris, France
| | - J A Noble
- Department of Engineering Science, University of Oxford, Oxford, UK
| | - D G Altman
- Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - A T Papageorghiou
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| |
Collapse
|
7
|
Pang R, Guo R, Wu X, Hu F, Liu M, Zhang L, Wang Z, Li K. Altered Regional Homogeneity in Chronic Insomnia Disorder with or without Cognitive Impairment. AJNR Am J Neuroradiol 2018; 39:742-747. [PMID: 29496724 DOI: 10.3174/ajnr.a5587] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 12/29/2017] [Indexed: 01/05/2023]
Abstract
BACKGROUND AND PURPOSE Many studies have shown that insomnia is an independent factor in cognitive impairment, but the involved neurobiological mechanisms remain unclear. We used regional homogeneity to explore the specific neurobiologic indicators of chronic insomnia disorder with mild cognitive impairment. MATERIALS AND METHODS Thirty-nine patients with insomnia were divided into a group with and without cognitive impairment; we also included a control group (n = 28). Abnormalities in brain functional activity were identified by comparing the regional homogeneity values for each brain region among the groups. RESULTS Subjective insomnia scores were negatively correlated with cognitive impairment after controlling for age, sex, and educational effects. Regions with significant differences in regional homogeneity values in the 3 groups were concentrated in the right medial prefrontal cortex, the right superior frontal gyrus, and the left superior occipital gyrus. Meanwhile, subjective insomnia scores were negatively correlated with the strength of the decreased regional homogeneity in the right medial prefrontal cortex. The increased regional homogeneity value in the right superior frontal gyrus was positively correlated with the Montreal Cognitive Assessment score in patients. CONCLUSIONS Our results indicate that decreased regional homogeneity values in the medial prefrontal cortex and increased regional homogeneity values in the cuneus may be important neurobiologic indicators of chronic insomnia disorder and accompanying cognitive impairment. Overall, our study described the regional homogeneity of the whole brain in chronic insomnia disorder with mild cognitive impairment and could be the basis for future studies.
Collapse
Affiliation(s)
- R Pang
- From the Departments of Radiology (R.P., M.L., Z.W., K.L.).,Department of Radiology (R.P., K.L.), Xuanwu Hospital, Capital Medical University, Beijing, China
| | | | - X Wu
- Acupuncture (X.W.), Dongfang Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - F Hu
- Institute of Automation (F.H.), Chinese Academy of Sciences. Beijing, China.,School of Automation (F.H.), Harbin University of Science and Technology, Harbin, China
| | - M Liu
- From the Departments of Radiology (R.P., M.L., Z.W., K.L.)
| | | | - Z Wang
- From the Departments of Radiology (R.P., M.L., Z.W., K.L.)
| | - K Li
- From the Departments of Radiology (R.P., M.L., Z.W., K.L.) .,Department of Radiology (R.P., K.L.), Xuanwu Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics (K.L.), Beijing, China
| |
Collapse
|
8
|
Kang K, Yang P, Pang R, Yue L, Zhang W. Cycle affects imidacloprid efficiency by mediating cytochrome P450 expression in the brown planthopper Nilaparvata lugens. Insect Mol Biol 2017; 26:522-529. [PMID: 28543984 DOI: 10.1111/imb.12313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Circadian clocks influence most behaviours and physiological activities in animals, including daily fluctuations in metabolism. However, how the clock gene cycle influences insects' responses to pesticides has rarely been reported. Here, we provide evidence that cycle affects imidacloprid efficacy by mediating the expression of cytochrome P450 genes in the brown planthopper (BPH) Nilaparvata lugens, a serious insect pest of rice. Survival bioassays showed that the susceptibility of BPH adults to imidacloprid differed significantly between the two time points tested [Zeitgeber Time 8 (ZT8) and ZT4]. After cloning the cycle gene in the BPH (Nlcycle), we found that Nlcycle was expressed at higher levels in the fat body and midgut, and its expression was rhythmic with two peaks. Knockdown of Nlcycle affected the expression levels and rhythms of cytochrome P450 genes as well as susceptibility to imidacloprid. The survival rates of BPH adults after treatment with imidacloprid did not significantly differ between ZT4 and ZT8 after double-stranded Nlcycle treatment. These findings can be used to improve pesticide use and increase pesticide efficiency in the field.
Collapse
Affiliation(s)
- K Kang
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - P Yang
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - R Pang
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - L Yue
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - W Zhang
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China
| |
Collapse
|
9
|
Pang R, Lee D. FINDING MEANING IN DEMENTIA FAMILY CAREGIVING: A PILOT STUDY. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- R. Pang
- The Nethersole School of Nursing, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - D. Lee
- The Nethersole School of Nursing, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| |
Collapse
|
10
|
Yao X, Zhang JJ, Han L, Pang R. [The expression of PIK3CA in nasopharyngeal carcinoma]. Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 31:687-690. [PMID: 29871347 DOI: 10.13201/j.issn.1001-1781.2017.09.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Indexed: 06/08/2023]
Abstract
Objective:Analysis of phosphatidyl inositol 3-kinase catalytic subunit of alpha(PIK3CA) expression in nasopharyngeal carcinoma and prognosis.Method:On normal nasopharyngeal mucosa and tissue adjacent to carcinoma and nasopharyngeal carcinoma tissues serine/threonine protein kinase (pAkt) and the expression of PIK3CA status detection,immunohistochemical method,in-depth analysis is made to the relationship between the development of tumor; The expression of tumour stage,prognosis and IK3CA comprehensive analysis of the relationship between.Result:Tissue adjacent to carcinoma,pAkt in nasopharyngeal carcinoma tissue,the expression of PIK3CA increased significantly(P<0.05). There was a significant correlation between the degree of overexpression of PIK3CA and clinical stage(T stage: r=0.437,P<0.01;N stage: r=0.318,P<0.05; clinical stage:r=0.496,P<0.01).Compared with PIK3CA-negative patients,PIK3CA-positive patients had a worse overall survival(P<0.01).Conclusion:PIK3CA is highly expressed in nasopharyngeal carcinoma,which is significantly associated with worse clinical stage and worse overall survival prognosis.
Collapse
Affiliation(s)
- X Yao
- Department of Oncology,Tumour Hospital,the Second People's Hospital of Yichang,China Three Gorges University,Yichang,443000,China
| | - J J Zhang
- Department of Oncology,Tumour Hospital,the Second People's Hospital of Yichang,China Three Gorges University,Yichang,443000,China
| | - L Han
- Department of Oncology,Tumour Hospital,the Second People's Hospital of Yichang,China Three Gorges University,Yichang,443000,China
| | - R Pang
- Department of Oncology,Tumour Hospital,the Second People's Hospital of Yichang,China Three Gorges University,Yichang,443000,China
| |
Collapse
|
11
|
Yao X, Zhang JJ, Han L, Pang R. [The ralationship between SUV values in PET/CT and clinical staging of nasopharyngeal carcinoma]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 31:464-466;474. [PMID: 29871287 DOI: 10.13201/j.issn.1001-1781.2017.06.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Indexed: 11/12/2022]
Abstract
Objective:The purpose of this study was to research the relationship between SUVmax-T, SUVmaxN and SUVmax value in the PET/CT and clinical stage in patients of nasopharyngeal carcinoma(NPC).Method:Collect the clinical data and SUX values of Fifty-four patients.The statistical analyses were performed by SPSS21.0 statistical software for Windows and the Pearson correlation analysis was used for data analysis. Result:SUVmaxT was significantly associated with T stage and clinical stage(P<0.05);SUVmaxN was significantly associated with N stage and clinical stage(P<0.01);SUVmax was significantly associated with T stage, N stage and clinical stage(P<0.01); there was no statistically significant difference betweeen SUVmax and pathology (P>0.05). Conclusion:The SUV values in PET/CT were associated with clinical stage of nasopharyngeal carcinioma(NPC).
Collapse
Affiliation(s)
- X Yao
- Department of Oncology,the Second People's Hospital of Yichang, Yichang,443000,China
| | - J J Zhang
- Department of Oncology,the Second People's Hospital of Yichang, Yichang,443000,China
| | - L Han
- Department of Oncology,the Second People's Hospital of Yichang, Yichang,443000,China
| | - R Pang
- Department of Oncology,the Second People's Hospital of Yichang, Yichang,443000,China
| |
Collapse
|
12
|
Hirst JE, Villar J, Victora CG, Papageorghiou AT, Finkton D, Barros FC, Gravett MG, Giuliani F, Purwar M, Frederick IO, Pang R, Cheikh Ismail L, Lambert A, Stones W, Jaffer YA, Altman DG, Noble JA, Ohuma EO, Kennedy SH, Bhutta ZA. The antepartum stillbirth syndrome: risk factors and pregnancy conditions identified from the INTERGROWTH-21 st Project. BJOG 2016; 125:1145-1153. [PMID: 28029221 PMCID: PMC6055673 DOI: 10.1111/1471-0528.14463] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/24/2016] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To identify risk factors for antepartum stillbirth, including fetal growth restriction, among women with well-dated pregnancies and access to antenatal care. DESIGN Population-based, prospective, observational study. SETTING Eight international urban populations. POPULATION Pregnant women and their babies enrolled in the Newborn Cross-Sectional Study of the INTERGROWTH-21st Project. METHODS Cox proportional hazard models were used to compare risks among antepartum stillborn and liveborn babies. MAIN OUTCOME MEASURES Antepartum stillbirth was defined as any fetal death after 16 weeks' gestation before the onset of labour. RESULTS Of 60 121 babies, 553 were stillborn (9.2 per 1000 births), of which 445 were antepartum deaths (7.4 per 1000 births). After adjustment for site, risk factors were low socio-economic status, hazard ratio (HR): 1.6 (95% CI, 1.2-2.1); single marital status, HR 2.0 (95% CI, 1.4-2.8); age ≥40 years, HR 2.2 (95% CI, 1.4-3.7); essential hypertension, HR 4.0 (95% CI, 2.7-5.9); HIV/AIDS, HR 4.3 (95% CI, 2.0-9.1); pre-eclampsia, HR 1.6 (95% CI, 1.1-3.8); multiple pregnancy, HR 3.3 (95% CI, 2.0-5.6); and antepartum haemorrhage, HR 3.3 (95% CI, 2.5-4.5). Birth weight <3rd centile was associated with antepartum stillbirth [HR, 4.6 (95% CI, 3.4-6.2)]. The greatest risk was seen in babies not suspected to have been growth restricted antenatally, with an HR of 5.0 (95% CI, 3.6-7.0). The population-attributable risk of antepartum death associated with small-for-gestational-age neonates diagnosed at birth was 11%. CONCLUSIONS Antepartum stillbirth is a complex syndrome associated with several risk factors. Although small babies are at higher risk, current growth restriction detection strategies only modestly reduced the rate of stillbirth. TWEETABLE ABSTRACT International stillbirth study finds individual risks poor predictors of death but combinations promising.
Collapse
Affiliation(s)
- J E Hirst
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - J Villar
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - C G Victora
- Programa de Pós-Graduação em Epidemiologia, Universidade Federal de Pelotas, Pelotas, Brazil
| | - A T Papageorghiou
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - D Finkton
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - F C Barros
- Programa de Pós-Graduação em Epidemiologia, Universidade Federal de Pelotas, Pelotas, Brazil.,Programa de Pós-Graduação em Saúde e Comportamento, Universidade Católica de Pelotas, Pelotas, RS, Brazil
| | - M G Gravett
- Global Alliance to Prevent Prematurity and Stillbirth (GAPPS), Seattle, WA, USA
| | - F Giuliani
- Dipartimento di Scienze della Sanità Pubblica e Pediatriche, Università degli Studi di Torino, Torino, Italy
| | - M Purwar
- Nagpur INTERGROWTH-21st Research Centre, Ketkar Hospital, Nagpur, India
| | - I O Frederick
- Center for Perinatal Studies, Swedish Medical Center, Seattle, WA, USA
| | - R Pang
- School of Public Health, Peking University, Beijing, China
| | - L Cheikh Ismail
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - A Lambert
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - W Stones
- Faculty of Health Sciences, Aga Khan University, Nairobi, Kenya
| | - Y A Jaffer
- Department of Family & Community Health, Ministry of Health, Muscat, Oman
| | - D G Altman
- Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - J A Noble
- Department of Engineering Science, University of Oxford, Oxford, UK
| | - E O Ohuma
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK.,Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - S H Kennedy
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | - Z A Bhutta
- Division of Women & Child Health, The Aga Khan University, Karachi, Pakistan.,Center for Global Health for Sick Children, Toronto, ON, Canada
| | | |
Collapse
|
13
|
Papageorghiou AT, Kemp B, Stones W, Ohuma EO, Kennedy SH, Purwar M, Salomon LJ, Altman DG, Noble JA, Bertino E, Gravett MG, Pang R, Cheikh Ismail L, Barros FC, Lambert A, Jaffer YA, Victora CG, Bhutta ZA, Villar J. Ultrasound-based gestational-age estimation in late pregnancy. Ultrasound Obstet Gynecol 2016; 48:719-726. [PMID: 26924421 PMCID: PMC6680349 DOI: 10.1002/uog.15894] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 02/12/2016] [Accepted: 02/18/2016] [Indexed: 05/04/2023]
Abstract
OBJECTIVE Accurate gestational-age (GA) estimation, preferably by ultrasound measurement of fetal crown-rump length before 14 weeks' gestation, is an important component of high-quality antenatal care. The objective of this study was to determine how GA can best be estimated by fetal ultrasound for women who present for the first time late in pregnancy with uncertain or unknown menstrual dates. METHODS INTERGROWTH-21st was a large, prospective, multicenter, population-based project performed in eight geographically defined urban populations. One of its principal components, the Fetal Growth Longitudinal Study, aimed to develop international fetal growth standards. Each participant had their certain menstrual dates confirmed by first-trimester ultrasound examination. Fetal head circumference (HC), biparietal diameter (BPD), occipitofrontal diameter (OFD), abdominal circumference (AC) and femur length (FL) were measured every 5 weeks from 14 weeks' gestation until delivery. For each participant, a single, randomly selected ultrasound examination was used to explore all candidate biometric variables and permutations to build models to predict GA. Regression equations were ranked based upon minimization of the mean prediction error, goodness of fit and model complexity. An automated machine learning algorithm, the Genetic Algorithm, was adapted to evaluate > 64 000 potential polynomial equations as predictors. RESULTS Of the 4607 eligible women, 4321 (94%) had a pregnancy without major complications and delivered a live singleton without congenital malformations. After other exclusions (missing measurements in GA window and outliers), the final sample comprised 4229 women. Two skeletal measures, HC and FL, produced the best GA prediction, given by the equation loge (GA) = 0.03243 × (loge (HC))2 + 0.001644 × FL × loge (HC) + 3.813. When FL was not available, the best equation based on HC alone was loge (GA) = 0.05970 × (loge (HC))2 + 0.000000006409 × (HC)3 + 3.3258. The estimated uncertainty of GA prediction (half width 95% interval) was 6-7 days at 14 weeks' gestation, 12-14 days at 26 weeks' gestation and > 14 days in the third trimester. The addition of FL to the HC model led to improved prediction intervals compared with using HC alone, but no further improvement in prediction was afforded by adding AC, BPD or OFD. Equations that included other measurements (BPD, OFD and AC) did not perform better. CONCLUSIONS Among women initiating antenatal care late in pregnancy, a single set of ultrasound measurements combining HC and FL in the second trimester can be used to estimate GA with reasonable accuracy. We recommend this tool for underserved populations but considerable efforts should be implemented to improve early initiation of antenatal care worldwide. © 2016 Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.
Collapse
Affiliation(s)
- A. T. Papageorghiou
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton CollegeUniversity of OxfordOxfordUK
| | - B. Kemp
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton CollegeUniversity of OxfordOxfordUK
| | - W. Stones
- Faculty of Health SciencesAga Khan UniversityNairobiKenya
- School of MedicineUniversity of St AndrewsSt AndrewsScotland
| | - E. O. Ohuma
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton CollegeUniversity of OxfordOxfordUK
- Centre for Statistics in Medicine, Botnar Research CentreUniversity of OxfordOxfordUK
| | - S. H. Kennedy
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton CollegeUniversity of OxfordOxfordUK
| | - M. Purwar
- Nagpur INTERGROWTH‐21 Research CentreKetkar HospitalNagpurIndia
| | - L. J. Salomon
- Maternité Necker‐Enfants Malades, AP‐HPUniversité Paris DescartesParisFrance
| | - D. G. Altman
- Center for Statistics in Medicine, Nuffield Department of OrthopaedicsRheumatology and Musculoskeletal Sciences, University of OxfordOxfordUK
| | - J. A. Noble
- Department of Engineering ScienceUniversity of OxfordOxfordUK
| | - E. Bertino
- Dipartimento di Scienze Pediatriche e dell'Adolescenza, Cattedra di NeonatologiaUniversità degli Studi di TorinoTurinItaly
| | - M. G. Gravett
- Global Alliance to Prevent Prematurity and Stillbirth (GAPPS)SeattleWAUSA
| | - R. Pang
- School of Public HealthPeking UniversityBeijingChina
| | - L. Cheikh Ismail
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton CollegeUniversity of OxfordOxfordUK
| | - F. C. Barros
- Programa de Pós‐Graduação em Saúde e ComportamentoUniversidade Católica de PelotasPelotasRSBrazil
- Programa de Pós‐Graduação em EpidemiologiaUniversidade Federal de PelotasPelotasRSBrazil
| | - A. Lambert
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton CollegeUniversity of OxfordOxfordUK
| | - Y. A. Jaffer
- Department of Family & Community HealthMinistry of HealthMuscatSultanate of Oman
| | - C. G. Victora
- Programa de Pós‐Graduação em EpidemiologiaUniversidade Federal de PelotasPelotasRSBrazil
| | - Z. A. Bhutta
- Division of Women & Child HealthThe Aga Khan UniversityKarachiPakistan
- Center for Global HealthHospital for Sick ChildrenTorontoONCanada
| | - J. Villar
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton CollegeUniversity of OxfordOxfordUK
| | | |
Collapse
|
14
|
Liu N, Xu X, Pang R, Raman PS, Khursheed A, van Kan JA. Brightness measurement of an electron impact gas ion source for proton beam writing applications. Rev Sci Instrum 2016; 87:02A903. [PMID: 26931964 DOI: 10.1063/1.4932005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We are developing a high brightness nano-aperture electron impact gas ion source, which can create ion beams from a miniature ionization chamber with relatively small virtual source sizes, typically around 100 nm. A prototype source of this kind was designed and successively micro-fabricated using integrated circuit technology. Experiments to measure source brightness were performed inside a field emission scanning electron microscope. The total output current was measured to be between 200 and 300 pA. The highest estimated reduced brightness was found to be comparable to the injecting focused electron beam reduced brightness. This translates into an ion reduced brightness that is significantly better than that of conventional radio frequency ion sources, currently used in single-ended MeV accelerators.
Collapse
Affiliation(s)
- N Liu
- Centre for Ion Beam Applications, Department of Physics, National University of Singapore, Singapore 117542
| | - X Xu
- Centre for Ion Beam Applications, Department of Physics, National University of Singapore, Singapore 117542
| | - R Pang
- Centre for Ion Beam Applications, Department of Physics, National University of Singapore, Singapore 117542
| | - P Santhana Raman
- Centre for Ion Beam Applications, Department of Physics, National University of Singapore, Singapore 117542
| | - A Khursheed
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583
| | - J A van Kan
- Centre for Ion Beam Applications, Department of Physics, National University of Singapore, Singapore 117542
| |
Collapse
|
15
|
Ng L, Wan T, Chow A, Man J, Iyer D, Leung WK, Yau T, Lo O, Foo D, Poon J, Law WL, Pang R. 37P Serum microRNAs as potential biomarker for screening colorectal cancer patients. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv518.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
16
|
Pang R, Li Y, Dong Y, Liang Z, Zhang Y, Zhang W. Identification of promoter polymorphisms in the cytochrome P450 CYP6AY1 linked with insecticide resistance in the brown planthopper, Nilaparvata lugens. Insect Mol Biol 2014; 23:768-778. [PMID: 25124988 DOI: 10.1111/imb.12121] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Imidacloprid resistance in the brown planthopper, Nilaparvata lugens, is primarily the result of the over-expression of cytochrome P450 monooxygenases. Here, a field-collected strain of N. lugens was shown to be highly resistant to both imidacloprid and buprofezin. Insecticide exposure and quantitative real-time PCR revealed that its resistance was mainly associated with a cytochrome P450 gene, CYP6AY1. CYP6AY1 is known to metabolize imidacloprid but its effect on buprofezin is unclear. In the 5'-untranslated region of CYP6AY1, a novel alternative splicing was detected. After a 1990-bp promoter region was cloned, its basal luciferase activity was assessed. Furthermore, genotyping studies identified 12 variations in the promoter region that discriminated between the field-collected and control strain. Finally, survival bioassays revealed a single nucleotide polymorphism and an insertion-deletion polymorphism linked to buprofezin and imidacloprid resistance. Mutagenesis of these sites enhanced the promoter activity of CYP6AY1. These results suggest that promoter polymorphisms may affect P450-mediated multiple insecticide resistance of pests.
Collapse
Affiliation(s)
- R Pang
- Key Laboratory of Biodiversity Dynamics and Conservation of Guangdong Higher Education Institutes, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China
| | | | | | | | | | | |
Collapse
|
17
|
Papageorghiou AT, Kennedy SH, Salomon LJ, Ohuma EO, Cheikh Ismail L, Barros FC, Lambert A, Carvalho M, Jaffer YA, Bertino E, Gravett MG, Altman DG, Purwar M, Noble JA, Pang R, Victora CG, Bhutta ZA, Villar J. International standards for early fetal size and pregnancy dating based on ultrasound measurement of crown-rump length in the first trimester of pregnancy. Ultrasound Obstet Gynecol 2014; 44:641-8. [PMID: 25044000 PMCID: PMC4286014 DOI: 10.1002/uog.13448] [Citation(s) in RCA: 152] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
OBJECTIVES There are no international standards for relating fetal crown-rump length (CRL) to gestational age (GA), and most existing charts have considerable methodological limitations. The INTERGROWTH-21(st) Project aimed to produce the first international standards for early fetal size and ultrasound dating of pregnancy based on CRL measurement. METHODS Urban areas in eight geographically diverse countries that met strict eligibility criteria were selected for the prospective, population-based recruitment, between 9 + 0 and 13 + 6 weeks' gestation, of healthy well-nourished women with singleton pregnancies at low risk of fetal growth impairment. GA was calculated on the basis of a certain last menstrual period, regular menstrual cycle and lack of hormonal medication or breastfeeding in the preceding 2 months. CRL was measured using strict protocols and quality-control measures. All women were followed up throughout pregnancy until delivery and hospital discharge. Cases of neonatal and fetal death, severe pregnancy complications and congenital abnormalities were excluded from the study. RESULTS A total of 4607 women were enrolled in the Fetal Growth Longitudinal Study, one of the three main components of the INTERGROWTH-21(st) Project, of whom 4321 had a live singleton birth in the absence of severe maternal conditions or congenital abnormalities detected by ultrasound or at birth. The CRL was measured in 56 women at < 9 + 0 weeks' gestation; these were excluded, resulting in 4265 women who contributed data to the final analysis. The mean CRL and SD increased with GA almost linearly, and their relationship to GA is given by the following two equations (in which GA is in days and CRL in mm): mean CRL = -50.6562 + (0.815118 × GA) + (0.00535302 × GA(2) ); and SD of CRL = -2.21626 + (0.0984894 × GA). GA estimation is carried out according to the two equations: GA = 40.9041 + (3.21585 × CRL(0.5) ) + (0.348956 × CRL); and SD of GA = 2.39102 + (0.0193474 × CRL). CONCLUSIONS We have produced international prescriptive standards for early fetal linear size and ultrasound dating of pregnancy in the first trimester that can be used throughout the world.
Collapse
Affiliation(s)
- A T Papageorghiou
- Nuffield Department of Obstetrics & Gynaecology and Oxford Maternal & Perinatal Health Institute, Green Templeton College, University of Oxford, Oxford, UK
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Chiu JW, Wong H, Leung R, Pang R, Cheung TT, Fan ST, Poon R, Yau T. Advanced pancreatic cancer: flourishing novel approaches in the era of biological therapy. Oncologist 2014; 19:937-50. [PMID: 25117068 PMCID: PMC4153449 DOI: 10.1634/theoncologist.2012-0131] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Accepted: 06/06/2014] [Indexed: 12/13/2022] Open
Abstract
The progress in the development of systemic treatment for advanced pancreatic cancer (APC) has been slow. The mainstream treatment remains using chemotherapy including gemcitabine, FOLFIRINOX, and nab-paclitaxel. Erlotinib is the only approved biological therapy with marginal benefit. Studies of agents targeting epidermal growth factor receptor, angiogenesis, and RAS signaling have not been satisfying, and the usefulness of targeted therapy in APC is uncertain. Understanding in molecular processes and tumor biology has opened the door for new treatment strategies such as targeting insulin-like growth factor 1 receptor, transforming growth factor β, phosphoinositide 3-kinase/AKT/mammalian target of rapamycin pathway, and Notch pathway. New directions also include the upcoming immunotherapy and many novel agents that act on the microenvironment. The practice of personalized medicine using predictive biomarkers and pharmacogenomics signatures may also enhance the effectiveness of existing treatment. Future treatment approaches may involve comprehensive genomic assessment of tumor and integrated combinations of multiple agents to overcome treatment resistance.
Collapse
Affiliation(s)
- Joanne W Chiu
- University Departments of Medicine and Surgery, Queen Mary Hospital, Hong Kong, People's Republic of China; Centre for Cancer Research, University of Hong Kong, Hong Kong, People's Republic of China
| | - Hilda Wong
- University Departments of Medicine and Surgery, Queen Mary Hospital, Hong Kong, People's Republic of China; Centre for Cancer Research, University of Hong Kong, Hong Kong, People's Republic of China
| | - Roland Leung
- University Departments of Medicine and Surgery, Queen Mary Hospital, Hong Kong, People's Republic of China; Centre for Cancer Research, University of Hong Kong, Hong Kong, People's Republic of China
| | - Roberta Pang
- University Departments of Medicine and Surgery, Queen Mary Hospital, Hong Kong, People's Republic of China; Centre for Cancer Research, University of Hong Kong, Hong Kong, People's Republic of China
| | - Tan-To Cheung
- University Departments of Medicine and Surgery, Queen Mary Hospital, Hong Kong, People's Republic of China; Centre for Cancer Research, University of Hong Kong, Hong Kong, People's Republic of China
| | - Sheung-Tat Fan
- University Departments of Medicine and Surgery, Queen Mary Hospital, Hong Kong, People's Republic of China; Centre for Cancer Research, University of Hong Kong, Hong Kong, People's Republic of China
| | - Ronnie Poon
- University Departments of Medicine and Surgery, Queen Mary Hospital, Hong Kong, People's Republic of China; Centre for Cancer Research, University of Hong Kong, Hong Kong, People's Republic of China
| | - Thomas Yau
- University Departments of Medicine and Surgery, Queen Mary Hospital, Hong Kong, People's Republic of China; Centre for Cancer Research, University of Hong Kong, Hong Kong, People's Republic of China
| |
Collapse
|
19
|
Pun JCS, Chan JYJ, Chun BKM, Ng KW, Tsui SYK, Wan TMH, Lo O, Poon JTC, Ng L, Pang R. Plasma Bmi1 mRNA as a potential prognostic biomarker for distant metastasis in colorectal cancer patients. Mol Clin Oncol 2014; 2:817-820. [PMID: 25054051 DOI: 10.3892/mco.2014.321] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Accepted: 04/01/2014] [Indexed: 01/21/2023] Open
Abstract
Bmi1 is overexpressed in gastrointestinal cancers, including colorectal cancer (CRC); however, its role as a non-invasive biomarker in CRC has not been established. The aim of this study was to compare the plasma Bmi1 mRNA levels prior to and following curative resection of the primary tumor in CRC patients and to determine their association with the clinicopathological parameters. The plasma Bmi1 mRNA level was measured by quantitative polymerase chain reaction and expressed as cycle threshold value. There was no significant difference between the overall pre- and postoperative plasma Bmi1 mRNA level (31.73±2.63 vs. 31.93±2.88, respectively; P=0.614) in 45 CRC patients. However, when grouped into non-metastatic and metastatic CRC patients, the postoperative Bmi1 transcript level was found to be significantly lower compared to the preoperative level in patients with non-metastatic CRC (32.13±2.677 31.44±2.764, respectively; P=0.041), whereas there was a trend towards a higher postoperative Bmi1 transcript level compared to the preoperative level in the metastatic counterpart (30.85±3.916 vs. 33.27±0.718, respectively; P=0.164). Furthermore, when the patients were categorized into two groups according to their plasma Bmi1 postoperative vs. preoperative level status, we observed that patients without a reduction in the postoperative plasma Bmi1 mRNA levels exhibited a significantly higher rate of distant metastasis following primary resection (P=0.017) and a significantly worse prognosis regarding disease-free survival (P=0.016) when compared to the reduced postoperative plasma Bmi1 level counterparts. In conclusion, plasma Bmi1 mRNA levels may serve as a non-invasive biomarker for monitoring occult metastasis and predicting the development of distant metastasis.
Collapse
Affiliation(s)
| | | | | | - Ka-Wai Ng
- The Chinese Foundation Secondary School, Hong Kong, SAR, P.R. China
| | | | - Timothy Ming-Hun Wan
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, SAR, P.R. China
| | - Oswens Lo
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, SAR, P.R. China
| | - Jensen Tung-Chung Poon
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, SAR, P.R. China
| | - Lui Ng
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, SAR, P.R. China
| | - Roberta Pang
- Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, SAR, P.R. China ; Centre for Cancer Research, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, SAR, P.R. China
| |
Collapse
|
20
|
Yau TC, Cheng PNM, Chan P, Pang R, Poon RTP. Preliminary efficacy, safety, pharmacokinetics, pharmacodynamics, and quality of life study of pegylated recombinant human arginase 1 in patients with advanced hepatocellular carcinoma. J Clin Oncol 2014. [DOI: 10.1200/jco.2014.32.15_suppl.e15137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | | | - Pierre Chan
- Department of Medicine, Ruttonjee Hospital, Hong Kong, Hong Kong
| | | | | |
Collapse
|
21
|
Jiang LH, Zhang YL, Gong XM, Pang R, Zhang S, Li CY, Su Q. LiSr4(BO3)3:Ce3+ phosphor as a new material for ESR dosimetry. Appl Radiat Isot 2013; 84:66-9. [PMID: 24321766 DOI: 10.1016/j.apradiso.2013.11.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Revised: 09/09/2013] [Accepted: 10/31/2013] [Indexed: 11/28/2022]
Abstract
LiSr4(BO3)3:0.01Ce(3+) phosphor was investigated to assess its potential as a material for measurements of radiotherapeutic doses with electron spin resonance (ESR). The ESR spectrum of the phosphor irradiated with (60)Co features five ESR signals. An isochronal annealing experiment has shown that the strongest of these signals is associated with the same trap center as the 473 K peak on the TL glow curve of this material. The dose-response is linear in the studied range from 0.89 to 90.30 Gy. Fading of the signal was also investigated.
Collapse
Affiliation(s)
- L H Jiang
- State Key Laboratory of Application of Rare Earth Resources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Y L Zhang
- Ionizing Radiation Division, National Institute of Metrology, Beijing 110000, China
| | - X M Gong
- Ionizing Radiation Division, National Institute of Metrology, Beijing 110000, China
| | - R Pang
- State Key Laboratory of Application of Rare Earth Resources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - S Zhang
- State Key Laboratory of Application of Rare Earth Resources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - C Y Li
- State Key Laboratory of Application of Rare Earth Resources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
| | - Q Su
- State Key Laboratory of Application of Rare Earth Resources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China; State Key Laboratory of Optoelectronic Materials and Technology, School of Chemistry and Chemical Engineering Department, Sun Yat-sen University, Guangzhou 510275, China
| |
Collapse
|
22
|
Eskenazi B, Bradman A, Finkton D, Purwar M, Noble JA, Pang R, Burnham O, Cheikh Ismail L, Farhi F, Barros FC, Lambert A, Papageorghiou AT, Carvalho M, Jaffer YA, Bertino E, Gravett MG, Altman DG, Ohuma EO, Kennedy SH, Bhutta ZA, Villar J. A rapid questionnaire assessment of environmental exposures to pregnant women in the INTERGROWTH-21st Project. BJOG 2013; 120 Suppl 2:129-38, v. [PMID: 24028080 DOI: 10.1111/1471-0528.12430] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/19/2013] [Indexed: 11/28/2022]
Abstract
Impaired fetal growth and preterm birth are the leading causes of neonatal and infant mortality worldwide and there is a growing scientific literature suggesting that environmental exposures during pregnancy may play a causal role in these outcomes. Our purpose was to assess the environmental exposure of the Fetal Growth Longitudinal Study (FGLS) participants in the multinational INTERGROWTH-21(st) Project. First, we developed a tool that could be used internationally to screen pregnant women for such exposures and administered it in eight countries on a subsample (n = 987) of the FGLS participants. The FGLS is a study of fetal growth among healthy pregnant women living in relatively affluent areas, at low risk of adverse pregnancy outcomes and environmental exposures. We confirmed that most women were not exposed to major environmental hazards that could affect pregnancy outcomes according to the protocol's entry criteria. However, the instrument was able to identify some women that reported various environmental concerns in their homes such as peeling paint, high residential density (>1 person per room), presence of rodents or cockroaches (hence the use of pesticides), noise pollution and safety concerns. This screening tool was therefore useful for the purposes of the project and can be used to ascertain environmental exposures in studies in which the primary aim is not focused on environmental exposures. The instrument can be used to identify subpopulations for more in-depth assessment, (e.g. environmental and biological laboratory markers) to pinpoint areas requiring education, intervention or policy change.
Collapse
Affiliation(s)
- B Eskenazi
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California, Berkeley, CA, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Niu Y, Pang R, Zhu C, Hayashi M, Fujimura Y, Lin S, Shen Y. Quantum chemical calculation of intramolecular vibrational redistribution and vibrational energy transfer of water clusters. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.09.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
24
|
Wang XQ, Ng RK, Ming X, Zhang W, Chen L, Chu ACY, Pang R, Lo CM, Tsao SW, Liu X, Poon RTP, Fan ST. Epigenetic regulation of pluripotent genes mediates stem cell features in human hepatocellular carcinoma and cancer cell lines. PLoS One 2013; 8:e72435. [PMID: 24023739 PMCID: PMC3762826 DOI: 10.1371/journal.pone.0072435] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 07/10/2013] [Indexed: 12/30/2022] Open
Abstract
Activation of the stem cell transcriptional circuitry is an important event in cancer development. Although cancer cells demonstrate a stem cell-like gene expression signature, the epigenetic regulation of pluripotency-associated genes in cancers remains poorly understood. In this study, we characterized the epigenetic regulation of the pluripotency-associated genes NANOG, OCT4, c-MYC, KLF4, and SOX2 in a variety of cancer cell lines and in primary tumor samples, and investigated the re-activation of pluripotency regulatory circuits in cancer progression. Differential patterns of DNA methylation, histone modifications, and gene expression of pluripotent genes were demonstrated in different types of cancers, which may reflect their tissue origins. NANOG promoter hypomethylation and gene upregulation were found in metastatic human liver cancer cells and human hepatocellular carcinoma (HCC) primary tumor tissues. The upregulation of NANOG, together with p53 depletion, was significantly associated with clinical late stage of HCC. A pro-metastatic role of NANOG in colon cancer cells was also demonstrated, using a NANOG-overexpressing orthotopic tumor implantation mouse model. Demethylation of NANOG promoter was observed in CD133+(high) cancer cells. In accordance, overexpression of NANOG resulted in an increase in the population of CD133+(high) cells. In addition, we demonstrated a cross-regulation between OCT4 and NANOG in cancer cells via reprogramming of promoter methylation. Taken together, epigenetic reprogramming of NANOG can lead to the acquisition of stem cell-like properties. These results underscore the restoration of pluripotency circuits in cancer cells as a potential mechanism for cancer progression.
Collapse
Affiliation(s)
- Xiao Qi Wang
- Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China
- State Key Laboratory for Liver Research, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Ray Kit Ng
- Department of Pathology, The University of Hong Kong, Pokfulam, Hong Kong, China
- Center for Reproduction, Development and Growth, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Xiaoyan Ming
- Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Wu Zhang
- Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Lin Chen
- Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Andrew C. Y. Chu
- Center for Cancer Research, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Roberta Pang
- Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Chung Mau Lo
- Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Sai Wah Tsao
- Department of Anatomy, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Xuqing Liu
- Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Ronnie T. P. Poon
- Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China
- State Key Laboratory for Liver Research, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Sheung Tat Fan
- Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China
- State Key Laboratory for Liver Research, The University of Hong Kong, Pokfulam, Hong Kong, China
| |
Collapse
|
25
|
Ng L, Tung-Ping Poon R, Yau S, Chow A, Lam C, Li HS, Chung-Cheung Yau T, Law WL, Pang R. Suppression of actopaxin impairs hepatocellular carcinoma metastasis through modulation of cell migration and invasion. Hepatology 2013; 58:667-79. [PMID: 23504997 DOI: 10.1002/hep.26396] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Accepted: 03/07/2013] [Indexed: 12/07/2022]
Abstract
UNLABELLED Early reports suggested that actopaxin, a member of the focal adhesion proteins, regulates cell migration. Here we investigated whether actopaxin is involved in hepatocellular carcinoma (HCC) progression and metastasis. We examined actopaxin expression in human HCC samples using immunohistochemistry and western blotting. The functional and molecular effect of actopaxin was studied in vitro by overexpression in a nonmetastatic HCC cell line, as well as repression in a metastatic cell line. The in vivo effect of actopaxin repression was studied in nonobese diabetic and severe combined immunodeficient mice. We found that actopaxin was frequently overexpressed in human HCC patients and its overexpression positively correlated with tumor size, stage, and metastasis. Actopaxin expression also correlated with the metastatic potential of HCC cell lines. Actopaxin overexpression induced the invasion and migration ability of nonmetastatic HCC cells, whereas down-regulation of actopaxin reverted the invasive phenotypes and metastatic potential of metastatic HCC cells through regulating the protein expression of certain focal adhesion proteins including ILK, PINCH, paxillin, and cdc42, as well as regulating the epithelial-mesenchymal transition pathway. Furthermore, there was a close association between actopaxin and CD29. HCC cells with stronger CD29 expression showed a higher actopaxin level, whereas actopaxin repression attenuated CD29 activity. Finally, actopaxin down-regulation enhanced the chemosensitivity of HCC cells towards oxaliplatin treatment by way of a collective result of suppression of survivin protein, β-catenin, and mammalian target of rapamycin pathways and up-regulation of p53. CONCLUSION This study provides concrete evidence of a significant role of actopaxin in HCC progression and metastasis, by way of regulation of cell invasiveness and motility, an epithelial-mesenchymal transition process, and chemosensitivity to cytotoxic drugs.
Collapse
Affiliation(s)
- Lui Ng
- Department of Surgery, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Chen W, Zhang X, Chu C, Cheung WL, Ng L, Lam S, Chow A, Lau T, Chen M, Li Y, Nie Y, Wong BC, Pang R. Identification of CD44+ cancer stem cells in human gastric cancer. Hepatogastroenterology 2013; 60:949-54. [PMID: 23478146 DOI: 10.5754/hge12881] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The cancer stem cell hypothesis suggests that tumors are initiated and maintained by cancer stem cells capable of self-renewal and differentiation into mature tumor cells. Recent studies have demonstrated the existence of cancer initiating cells in different solid tumors. In this study, we identified a subpopulation of CD44+ cells within the tumor of gastric cancer patients, which, upon treatment by chemotherapeutic agent 5-fluorouracil (5-FU), were markedly enriched. In vitro culture of isolated CD44+ subpopulation from gastric tumors by magnetic beads sorting led to formation of gastric spheroid colonies. These colonies retained CD44+ surface marker expression during culture, and were undifferentiated in nature. Subcutaneous injections of CD44+ gastric cancer cells conferred tumorigenicity in SCID mice. Moreover, implantation of CD44+ cells from these established tumors remained tumorigenic in successive passages. Using CD44+ cells isolated from the gastric cell lines AGS and SGC7901, similar results were obtained. Upon enrichment by 5-FU, CD44+ cells harbored increased ALDH expression as compared with CD44- cells. Our results demonstrated for the first time the existence of CD44+ cells within the tumors of gastric cancer patients that are endowed with stem cells properties, and also provide a plausible explanation for chemo-resistance frequently observed in gastric cancer patients. Such findings provide a basis for further studies on targeting this tumorigenic subpopulation for better treatment of gastric cancer patients.
Collapse
|
27
|
Cheng CW, Chow AKM, Pang R, Fok EWS, Kwong YL, Tse E. PIN1 inhibits apoptosis in hepatocellular carcinoma through modulation of the antiapoptotic function of survivin. Am J Pathol 2013; 182:765-75. [PMID: 23333752 DOI: 10.1016/j.ajpath.2012.11.034] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Revised: 10/29/2012] [Accepted: 11/16/2012] [Indexed: 12/18/2022]
Abstract
PIN1, a peptidyl-prolyl-isomerase, binds a specific motif comprising a phosphorylated serine or threonine preceding a proline (p-Ser/Thr-Pro) residue in proteins. Through cis-trans isomerization, it induces conformational changes and modulates functions of many proteins that are involved in cell cycle progression, cell proliferation, and oncogenesis. PIN1 is overexpressed in hepatocellular carcinomas (HCC) and contributes to hepatocarcinogenesis. We investigated the role of PIN1 and the significance of its interaction with the inhibitor of apoptosis protein survivin in evading apoptosis in HCC cells. Using cell line and xenograft models, we determined that PIN1 overexpression inhibits apoptosis through suppression of caspase-3 and caspase-9 activity. In addition, down-regulation of survivin in PIN1-overexpressing cells attenuated the antiapoptotic effect induced by PIN1, suggesting that the inhibition of apoptosis is mediated through PIN1-survivin interaction. Coimmunoprecipitation assays showed that PIN1 interacted with survivin via the phosphorylated Thr34-Pro35 motif and enhanced binding among survivin phosphorylated at Thr34, hepatitis B X-interacting protein (HBXIP), and pro-caspase-9. Taken together, these results suggest that the inhibition of apoptosis by PIN1 in HCC cells is mediated through modulation of the antiapoptotic function of survivin by increasing its binding to pro-caspase-9 via HBXIP. Such functional interaction between PIN1 and survivin may therefore play an important role in hepatocarcinogenesis and chemoresistance.
Collapse
Affiliation(s)
- Chi-Wai Cheng
- Division of Haematology and Medical Oncology, Department of Medicine, University of Hong Kong, Queen Mary Hospital, Hong Kong, China
| | | | | | | | | | | |
Collapse
|
28
|
Ng EKO, Li R, Shin VY, Jin HC, Leung CPH, Ma ESK, Pang R, Chua D, Chu KM, Law WL, Law SYK, Poon RTP, Kwong A. Circulating microRNAs as specific biomarkers for breast cancer detection. PLoS One 2013; 8:e53141. [PMID: 23301032 PMCID: PMC3536802 DOI: 10.1371/journal.pone.0053141] [Citation(s) in RCA: 195] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Accepted: 11/23/2012] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND We previously showed microRNAs (miRNAs) in plasma are potential biomarkers for colorectal cancer detection. Here, we aimed to develop specific blood-based miRNA assay for breast cancer detection. METHODOLOGY/PRINCIPAL FINDINGS TaqMan-based miRNA profiling was performed in tumor, adjacent non-tumor, corresponding plasma from breast cancer patients, and plasma from matched healthy controls. All putative markers identified were verified in a training set of breast cancer patients. Selected markers were validated in a case-control cohort of 170 breast cancer patients, 100 controls, and 95 other types of cancers and then blindly validated in an independent set of 70 breast cancer patients and 50 healthy controls. Profiling results showed 8 miRNAs were concordantly up-regulated and 1 miRNA was concordantly down-regulated in both plasma and tumor tissue of breast cancer patients. Of the 8 up-regulated miRNAs, only 3 were significantly elevated (p<0.0001) before surgery and reduced after surgery in the training set. Results from the validation cohort showed that a combination of miR-145 and miR-451 was the best biomarker (p<0.0001) in discriminating breast cancer from healthy controls and all other types of cancers. In the blind validation, these plasma markers yielded Receiver Operating Characteristic (ROC) curve area of 0.931. The positive predictive value was 88% and the negative predictive value was 92%. Altered levels of these miRNAs in plasma have been detected not only in advanced stages but also early stages of tumors. The positive predictive value for ductal carcinoma in situ (DCIS) cases was 96%. CONCLUSIONS These results suggested that these circulating miRNAs could be a potential specific biomarker for breast cancer screening.
Collapse
Affiliation(s)
- Enders K. O. Ng
- Department of Surgery, The University of Hong Kong, Hong Kong, China
- Department of Molecular Pathology, Hong Kong Sanatorium and Hospital, Hong Kong, China
| | - Rufina Li
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - Vivian Y. Shin
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - Hong Chuan Jin
- Biomedical Research Center, Sir Runrun Shaw Hospital, Medical School of Zhejiang University, Hangzhou, China
| | - Candy P. H. Leung
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - Edmond S. K. Ma
- Department of Molecular Pathology, Hong Kong Sanatorium and Hospital, Hong Kong, China
| | - Roberta Pang
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - Daniel Chua
- Department of Clinical Oncology, The University of Hong Kong, Hong Kong, China
| | - Kent-Man Chu
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - W. L. Law
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - Simon Y. K. Law
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - Ronnie T. P. Poon
- Department of Surgery, The University of Hong Kong, Hong Kong, China
| | - Ava Kwong
- Department of Surgery, The University of Hong Kong, Hong Kong, China
- Department of Molecular Pathology, Hong Kong Sanatorium and Hospital, Hong Kong, China
| |
Collapse
|
29
|
Tan VPY, Cheung TK, Wong WM, Pang R, Wong BCY. Treatment of functional dyspepsia with sertraline: A double-blind randomized placebo-controlled pilot study. World J Gastroenterol 2012; 18:6127-33. [PMID: 23155342 PMCID: PMC3496890 DOI: 10.3748/wjg.v18.i42.6127] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Revised: 07/16/2012] [Accepted: 07/28/2012] [Indexed: 02/06/2023] Open
Abstract
AIM: To evaluate sertraline, a selective serotonin reuptake inhibitor in the treatment of patients with functional dyspepsia.
METHODS: Consecutive tertiary hospital patients with a clinical diagnosis of functional dyspepsia (FD) according to the Rome II criteria with a Hong Kong dyspepsia index (HKDI) of greater than 16 were recruited. Patients commenced enrolment prior to the inception of the Rome III criteria for functional dyspepsia. All patients were ethnic Chinese, had a normal upper endoscopy and were Helicobacter pylori negative prior to enrolment. Study patients were randomized to receive sertraline 50 mg or placebo daily for 8 wk. HKDI symptom scores, quality of life, hospital anxiety and depression (HAD) scale and global symptom relief were evaluated before, during and after treatment. Adverse effects were monitored during and after treatment.
RESULTS: A total of 193 patients were randomized in the intention to treat (ITT), and 150 patients were included in the per protocol (PP) analysis. In both the ITT and PP, there was no difference in the primary outcome of global dyspepsia symptoms between the sertraline and placebo groups at week 8. In the ITT analysis, 98 and 95 patients were randomized to the sertraline and placebo groups respectively. A total of 43 patients withdrew from the study (22.3%) by week 8, with 23 of the 24 drop-outs in the sertraline group occurring prior to week 4 (95.8%). In contrast, in the placebo arm, 11 of 19 patients dropped out by week 4 (57.9%). Utilizing the last response carried forward to account for the drop-outs, there were no differences between the sertraline and placebo groups at baseline in terms of the HKDI, HKDI 26.08 ± 6.19 vs 26.70 ± 5.89, P = 0.433; and at week 8, HKDI 22.41 ± 6.36 vs 23.25 ± 7.30, P = 0.352 respectively. In the PP analysis, 74 and 76 patients were randomized to the sertraline and placebo groups respectively. At baseline, there were no statistically significant differences between the sertraline and placebo groups, HKDI 25.83 ± 6.313 vs 27.19 ± 5.929 respectively, P = 0.233; however by week 8, patients in the sertraline group demonstrated a statistically significant difference in their Hong Kong Dyspepsia Index compared to placebo, HKDI 20.53 ± 6.917 vs 23.34 ± 7.199, P = 0.02, respectively). There was also no statistically significant difference in overall quality of life measures or the HAD scale related to treatment in either the ITT or PP analysis at week 8.
CONCLUSION: This pilot study, the first to examine sertraline, a selective serotonin reuptake inhibitor, for the management of FD, did not find that it was superior to placebo.
Collapse
|
30
|
Xu FX, Zhou X, Shen F, Pang R, Liu SM. Decreased peripheral blood mitochondrial DNA content is related to HbA1c, fasting plasma glucose level and age of onset in type 2 diabetes mellitus. Diabet Med 2012; 29:e47-54. [PMID: 22211946 DOI: 10.1111/j.1464-5491.2011.03565.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS Mitochondrial DNA (mtDNA) content is essential for maintaining normal mitochondrial function, and the mitochondrial function is critical for the production and the release of insulin in Type 2 diabetes mellitus. We investigated whether peripheral blood mtDNA content was reduced in Type 2 diabetes, and what were the major factors? METHODS The mtDNA content of peripheral blood in a sample of 147 Type 2 diabetes and 170 normal Chinese subjects was determined by amplification of the mitochondrial gene CYT-B and normalized by a nuclear DNA β-globin gene. Fasting plasma glucose, HbA(1c) , fasting plasma insulin and lipid profile (HDL-cholesterol, LDL-cholesterol, total cholesterol, triglyceride) were analysed with commercial kits on an automatic analyser. RESULTS In Type 2 diabetes group, the mean HbA(1c) was 62 mmol/mol (7.8%). Moreover, BMI, systolic blood pressure, diastolic blood pressure, fasting plasma glucose, LDL-cholesterol, triglyceride, fasting plasma insulin and homeostasis model assessment for insulin resistance were significantly higher in Type 2 diabetes group than that in control group. Peripheral blood mtDNA content was 24% lower than that in the controls (1.4 ± 0.5 vs. 1.8 ± 0.7, P < 0.001). The mtDNA content was negatively correlated with BMI, fasting plasma glucose, fasting plasma insulin, homeostasis model assessment for insulin resistance (P < 0.01), and age, triglyceride and LDL-cholesterol levels (P < 0.05); while positively correlated with HDL-cholesterol level (P < 0.05) in both groups. Stepwise regression analysis indicated that HbA(1c), fasting plasma glucose and age of onset were the major factors affecting the mtDNA content in the Type 2 diabetes group; however, BMI was the only variable associated with lower mtDNA content in control group. CONCLUSION Our results demonstrate that lower peripheral blood mtDNA content is associated with Type 2 diabetes in Chinese individuals, and HbA(1c), fasting plasma glucose and age of onset are the major factors affecting the mtDNA content.
Collapse
Affiliation(s)
- F X Xu
- Center for Gene Diagnosis, Zhongnan Hospital, Wuhan University, Wuhan, China
| | | | | | | | | |
Collapse
|
31
|
Chiu J, Tang YF, Yao TJ, Wong A, Wong H, Leung R, Chan P, Cheung TT, Chan AC, Pang R, Fan ST, Poon R, Yau T. The use of single-agent sorafenib in the treatment of advanced hepatocellular carcinoma patients with underlying Child-Pugh B liver cirrhosis: a retrospective analysis of efficacy, safety, and survival benefits. Cancer 2012; 118:5293-301. [PMID: 22517493 DOI: 10.1002/cncr.27543] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Revised: 02/07/2012] [Accepted: 02/14/2012] [Indexed: 12/22/2022]
Abstract
BACKGROUND This study explored the efficacy, tolerability, and survival benefits of using sorafenib in patients with Child-Pugh class B (CPB) cirrhosis. METHODS Patients with advanced hepatocellular carcinoma who were treated with sorafenib at Queen Mary Hospital, Hong Kong, China, were analyzed retrospectively. Treatment outcomes were analyzed according to their respective Child-Pugh status. Patients with CPB disease were further divided into CPB7 (those with a score of 7) and CPB8-9 (a score of 8 or 9) subgroups. RESULTS The baseline demographic parameters were comparable between 108 patients with Child-Pugh class A (CPA) disease and 64 CPB patients. Both clinical benefit rate (21.3% vs 32.4% vs 14.8%; P = .23) and progression-free survival (median: 3.2 months vs 3.2 months vs 2.3 months; P = .26) were similar among CPA, CPB7, and CPB8-9 groups, respectively. The overall survival was different among these groups (P = .002) and showed a trend toward worse outcome in CPB patients: the median was 6.1, 5.4, and 2.7 months among CPA, CPB7, and CPB8-9 patients, respectively. The commonest grade 3/4 adverse events were hand-foot syndrome (13.5%), diarrhea (9.9%), and rash (7.0%). Grade 3/4 leukopenia, thrombocytopenia, and anemia occurred in 2.9%, 5.3%, and 8.8% of the patients, respectively. Overall, the 3 groups of patients experienced similar incidence of most of these adverse events. Nonetheless, CPB patients experienced more anemia (P = .01), gastrointestinal bleeding (P = .02), and hepatic encephalopathy (P = .02). CONCLUSIONS CPA and CPB patients tolerated sorafenib similarly and derived similar clinical and progression-free survival benefit. Among CPB patients, most benefits were observed in patients with a score of 7. Nevertheless, CPB patients were more susceptible to developing cirrhotic complications, and thus more vigilant surveillance is needed.
Collapse
Affiliation(s)
- Joanne Chiu
- Department of Medicine, Queen Mary Hospital, Hong Kong, China
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Yau T, Wong H, Chan P, Yao TJ, Pang R, Cheung TT, Fan ST, Poon RT. Phase II study of bevacizumab and erlotinib in the treatment of advanced hepatocellular carcinoma patients with sorafenib-refractory disease. Invest New Drugs 2012; 30:2384-90. [PMID: 22402942 PMCID: PMC3484314 DOI: 10.1007/s10637-012-9808-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2012] [Accepted: 02/26/2012] [Indexed: 12/14/2022]
Abstract
Background The combination of bevacizumab (B) and erlotinib (E) has shown promising clinical outcomes as the first-line treatment of advanced HCC patients. We aimed to evaluate the efficacy and safety of using combination of B + E in treating advanced HCC patients who had failed prior sorafenib treatment. Methods Eligible advanced HCC patients with documented radiological evidence of disease progression with sorafenib treatment were recruited. All patients received bevacizumab(B) at 10 mg/kg every 2 weeks with erlotinib(E) at 150 mg daily for a maximum of 6 cycles. Response assessments using both RECIST and modified RECIST criteria were performed after every 6 weeks. The primary endpoint was clinical benefit (CB) rate and a Simon two-stage design was employed. Results The trial was halted in the first stage according to the pre-set statistical criteria with 10 patients recruited. The median age was 47 years (range, 28–61) and all patients were in ECOG performance status 1. Eighty percent of patients were chronic hepatitis B carriers and all patients had Child A cirrhosis. Among these 10 patients, none of the enrolled patients achieved response or stable disease. The median time-to-progression was 1.81 months (95 % confidence interval [C.I.], 1.08–1.74 months) and overall survival was 4.37 months (95 % C.I., 1.08–11.66 months). Rash (70 %), diarrhea (50 %) and malaise (40 %) were the most commonly encountered toxicities. Conclusion The combination of B + E was well tolerated but had no activity in an unselected sorafenib-refractory advanced HCC population. Condensed abstract The combination of bevacizumab and erlotinib had no clinical activity in sorafenib-refractory HCC population.
Collapse
Affiliation(s)
- Thomas Yau
- Department of Surgery, The University of Hong Kong, Queen Mary Hospital, Room 211B, 2/F New Clinical Building, 102 Pokfulam Road, Hong Kong, China.
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Yau T, Yao TJ, Chan P, Wong H, Pang R, Fan ST, Poon RTP. The significance of early alpha-fetoprotein level changes in predicting clinical and survival benefits in advanced hepatocellular carcinoma patients receiving sorafenib. Oncologist 2011; 16:1270-9. [PMID: 21885876 DOI: 10.1634/theoncologist.2011-0105] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND he role of serum alpha-fetoprotein (AFP) changes in predicting the treatment outcomes of advanced hepatocellular carcinoma (HCC) patients to sorafenib remains unknown. METHODS Serum AFP was collected prospectively at baseline and subsequent follow-up visits in parallel with clinical and survival outcomes. AFP response was defined as a relative drop of AFP >20% of the baseline level after 6 weeks of sorafenib. The relationship between AFP response and the treatment outcomes was first explored in patients who received sorafenib in a phase II study. Subsequently, an independent validation set of patients were obtained to validate the association of AFP response to clinical outcomes. RESULTS Included in the exploration and validation sets for analysis were 41 and 53 patients, respectively, with baseline AFP level >20 μg/L. In the exploration cohort, AFP response was significantly associated with clinical benefit (CB) rate (relative chance 3.4, 95% confidence interval [CI], 1.1-11.1), and multivariate analysis indicated that AFP response was associated with significantly better progression-free survival (PFS) (hazard ratio [HR], 0.31; 95% CI, 0.13-0.76) and marginally better overall survival (OS) (HR, 0.30; 95% CI, 0.09-1.02). When applying AFP changes in the validation set, significant associations were again found between AFP response with CB rate (relative chance, 5.5; 95% CI, 2.3-13.6) and PFS (HR, 0.12; 95% CI, 0.04-0.30) but not OS (HR, 0.61; 95% CI, 0.27-1.26). CONCLUSION Drop in AFP level at 6 weeks is an exploratory early surrogate for both CB and PFS in advanced HCC patients receiving sorafenib.
Collapse
Affiliation(s)
- Thomas Yau
- Department of Surgery, Queen Mary Hospital, Hong Kong, China
| | | | | | | | | | | | | |
Collapse
|
34
|
Tan VPY, Wong WM, Cheung TK, Lai KC, Hung IFN, Chan P, Pang R, Wong BCY. Treatment of non-erosive reflux disease with a proton pump inhibitor in Chinese patients: a randomized controlled trial. J Gastroenterol 2011; 46:906-12. [PMID: 21538030 DOI: 10.1007/s00535-011-0402-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Accepted: 03/17/2011] [Indexed: 02/07/2023]
Abstract
BACKGROUND Evidence suggests that rates of gastroesophageal reflux disease are increasing in the Asia-Pacific region, where patients tend to have predominantly non-erosive reflux disease as opposed to erosive (reflux) esophagitis. At present, data for the responsiveness of non-erosive reflux disease to proton pump inhibition are scant. We aimed to study esomeprazole for the treatment of non-erosive reflux disease in Chinese patients. METHODS Patients with a clinical diagnosis of gastroesophageal reflux, and a locally validated reflux index, the Chinese GerdQ, of equal to or greater than 12 were recruited and randomized to receive esomeprazole 20 mg daily or placebo for 8 weeks. Reflux index scores, quality of life (SF-36), and the hospital anxiety and depression (HAD) scale and symptom relief were evaluated before, during, and after treatment. RESULTS A total of 175 patients were randomized. Patients in the esomeprazole group (n = 85) demonstrated statistically significant reductions in their GerdQ index, from 19.45 to 15.37 and to 14.32 (p = 0.013, p = 0.005) at weeks 4 and 8, respectively. Compared to placebo at week 8, 57.1% of patients on esomeprazole found that their symptoms had resolved or were acceptable compared with 37.2% in the placebo group (p = 0.001). There were no statistically significant differences in overall quality-of-life measures or the HAD scale related to treatment. CONCLUSIONS This study suggests that esomeprazole is efficacious in treating Chinese patients with non-erosive reflux disease.
Collapse
Affiliation(s)
- Victoria P Y Tan
- Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong, China
| | | | | | | | | | | | | | | |
Collapse
|
35
|
Zou B, Chim CS, Pang R, Zeng H, Dai Y, Zhang R, Lam CS, Tan VP, Hung IF, Lan HY, Wong BC. XIAP-associated factor 1 (XAF1), a novel target of p53, enhances p53-mediated apoptosis via post-translational modification. Mol Carcinog 2011; 51:422-32. [DOI: 10.1002/mc.20807] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Revised: 04/11/2011] [Accepted: 05/03/2011] [Indexed: 01/08/2023]
|
36
|
Yau T, Leung RC, Wong H, Chiu J, Chan P, Pang R, Fan ST, Poon RTP. Efficacy and safety of single-agent sunitinib in treating patients with advanced hepatocelluar carcinoma after sorafenib failure: A prospective, open-label, phase II study. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.4082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
37
|
Ng L, Poon R, Wong BCY, Pang R. Abstract 2365: Actopaxin: A novel regulator of cell migration and invasion in human hepatocellular carcinoma. Cancer Res 2011. [DOI: 10.1158/1538-7445.am2011-2365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: The mortality rate of hepatocellular carcinoma (HCC) is high due to tumor recurrence and development of metastasis, involving cell spreading, lamellipodia formation and cell migration. Formation of focal adhesions is a key regulator of cell motility and cell invasion. Actopaxin, a focal adhesion and cytoskeleton-associated protein, is required for such processes. The aim of this study was to examine the role of Actopaxin in HCC cell migration, invasion and development of metastasis.
Methods: The expression of Actopaxin in primary and metastatic liver cancer cell-lines was examined by western blot and RT-PCR. The functional and molecular effects of Actopaxin expression were studied by transient as well as stable enforced expression or down-regulation in HCC cell-lines. Immunofluorescence staining for actin cytoskeleton and focal adhesion was performed to examine the effect of Actopaxin expression on cell shape, stress fiber organization, and focal adhesion. The clinicopathological significance of Actopaxin expression in tumorous tissues of 119 HCC patients was also investigated.
Results: High protein level of Actopaxin was found in the metastatic HCC cell-lines compared with other non-metastatic HCC cell-lines. Expression of a shorter form of Actopaxin was also detected in some of these cell-lines. Comparing to Actopaxin (LF-Actopaxin), the unreported short form (SF-Actopaxin) lacks a fragment in the C-terminal and hence results in an incomplete 2nd CH domain which consists binding sites for its downstream activation targets. Expression of LF-Actopaxin but not SF-Actopaxin in HCC cell-lines was positively correlated with their migration and invasion potential in vitro, accompanied by altered expressions of several focal adhesion proteins as well as EMT proteins. Study in clinical samples showed that LF-Actopaxin expression was positively correlated with tumor size (p<0.05) while SF-Actopaxin expression was lower in HCC tumor compared with corresponding nontumorous liver (p<0.001) and lower in HCC with metastasis compared with HCC without metastasis (p<0.05).
Conclusion: This study demonstrated for the first time the pro-migratory effects of Actopaxin in human HCC, and the existence of SF-Actopaxin which displays different expression pattern as well as functional and molecular effects.
.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 2365. doi:10.1158/1538-7445.AM2011-2365
Collapse
Affiliation(s)
- Lui Ng
- 1The University of Hong Kong, Pokfulam, Hong Kong
| | - Ronnie Poon
- 1The University of Hong Kong, Pokfulam, Hong Kong
| | - BCY Wong
- 1The University of Hong Kong, Pokfulam, Hong Kong
| | - Roberta Pang
- 1The University of Hong Kong, Pokfulam, Hong Kong
| |
Collapse
|
38
|
Lau CK, Yang ZF, Ho DW, Lam CT, Pang R, Fan ST, Poon RT. Abstract 2554: Synergistic antitumor effect of AUY922 in combination with sorafenib in hepatocellular carcinoma cells. Cancer Res 2011. [DOI: 10.1158/1538-7445.am2011-2554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
PURPOSE: Molecularly targeted therapy is of particular importance for HCC due to a lack of efficacy with currently approved chemo-toxic therapies. It is of interest to investigate the combined effect of two molecular targeted drugs, sorafenib (a multi-kinase inhibitor with anti-angiogenic, pro-apoptotic and Raf kinase inhibitory activity) and a highly potent non-geldamycin HSP90 inhibitor, NVP-AUY922 on HCC treatment. EXPERIMENTAL DESIGNS: Cell viability after different treatments was measured by both 3,[4,5-dimethylthiazol-2-yl] -2,5-diphenyl-tetrazolium bromide (MTT) assay and cytofluorometric annexin-V apoptotic assay to compare the apoptotic cells induced by single versus combined treatment. Cell cycle analysis was also performed, and Western blotting was employed to determine the effects on MEK signaling, and in vivo efficacy was determined in nude mice with PLC/PRF/5 xenografts. RESULTS: Combined drugs treatment produced a synergistic effect on decreased HCC cell viability shown by MTT assay. An increase in the number of apoptotic cells were observed by apoptotic assay in combined drugs group when compared with single agents sorafenib or NVP-AUY922. Also, sorafenib combined with NVP-AUY922 induced S-phase arrest which was demonstrated by cell cycle analysis. Sorafenib alone decreases phospho-Erk1/2 expression, and this effect was further enhanced in combination treatment with NVP-AUY922. Finally, sorafenib plus NVP-AUY922 significantly suppressed PLC/PRF/5 xenograft tumor growth when compared with single (NVP-AUY922 or Sorafenib) treatment alone. CONCLUSION: The combination therapy of sorafenib and NVP-AUY922 can be a new and promising therapeutic approach to the treatment of HCC.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 2554. doi:10.1158/1538-7445.AM2011-2554
Collapse
Affiliation(s)
- Chi-Keung Lau
- 1Department of Surgery, University of Hong Kong, Hong Kong SAR, China
| | - Z F. Yang
- 1Department of Surgery, University of Hong Kong, Hong Kong SAR, China
| | - D W. Ho
- 1Department of Surgery, University of Hong Kong, Hong Kong SAR, China
| | - C T. Lam
- 1Department of Surgery, University of Hong Kong, Hong Kong SAR, China
| | - R Pang
- 1Department of Surgery, University of Hong Kong, Hong Kong SAR, China
| | - S T. Fan
- 1Department of Surgery, University of Hong Kong, Hong Kong SAR, China
| | - R T. Poon
- 1Department of Surgery, University of Hong Kong, Hong Kong SAR, China
| |
Collapse
|
39
|
Yau T, Chan P, Pang R, Ng K, Fan ST, Poon RT. Phase 1-2 trial of PTK787/ZK222584 combined with intravenous doxorubicin for treatment of patients with advanced hepatocellular carcinoma: implication for antiangiogenic approach to hepatocellular carcinoma. Cancer 2010; 116:5022-9. [PMID: 20629034 DOI: 10.1002/cncr.25372] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND This phase 1-2 trial assessed the efficacy and tolerability of an oral angiogenesis inhibitor-PTK787/ZK222584 (PTK)-in combination with intravenous doxorubicin for the treatment of advanced hepatocellular carcinoma (HCC) patients. METHODS In phase 1, advanced HCC patients received PTK at escalating doses together with doxorubicin 60 mg/m2 given as an intravenous bolus every 3 weeks to establish the maximum tolerated dose (MTD). Subsequently, in phase 2, all patients received the same regimen with oral PTK at the MTD dose every 3 weeks for a maximum of 6 cycles. RESULTS Nine patients were recruited in phase 1, with the MTD established as 750 mg daily. Overall, 27 patients received the regimen with PTK at 750 mg daily. The median age was 52 years (range, 23-73 years), and 63 percent of patients were chronic hepatitis B carriers. Notably, the majority of patients had Child-Pugh B cirrhosis. The overall response rate was 26.0%, with all the responding patients having partial response. Another 20% of patients achieved stable disease for at least 12 weeks. The median progression-free survival was 5.4 months (range, 0.27-23.6 months), and overall survival was 7.3 months (range, 0.8-23.6 months). The commonest grade 3 or 4 nonhematological toxicities were mucositis (11%) and alopecia (7%), respectively. Grade 3 or 4 neutropenia was observed in 7 (26%) patients; 2 had neutropenic sepsis. CONCLUSIONS The combination of PTK with intravenous doxorubicin shows encouraging activity in treating advanced HCC patients.
Collapse
Affiliation(s)
- Thomas Yau
- Department of Medicine, University of Hong Kong, Queen Mary Hospital, Hong Kong, China
| | | | | | | | | | | |
Collapse
|
40
|
Pang R, Law WL, Chu ACY, Poon JT, Lam CSC, Chow AKM, Ng L, Cheung LWH, Lan XR, Lan HY, Tan VPY, Yau TC, Poon RT, Wong BCY. A subpopulation of CD26+ cancer stem cells with metastatic capacity in human colorectal cancer. Cell Stem Cell 2010; 6:603-15. [PMID: 20569697 DOI: 10.1016/j.stem.2010.04.001] [Citation(s) in RCA: 402] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Revised: 02/18/2010] [Accepted: 04/09/2010] [Indexed: 12/15/2022]
Abstract
Recent evidence suggests that a subpopulation of cancer cells, cancer stem cells (CSCs), is responsible for tumor growth in colorectal cancer. However, the role of CSCs in colorectal cancer metastasis is unclear. Here, we identified a subpopulation of CD26(+) cells uniformly present in both the primary and metastatic tumors in colorectal cancer patients with liver metastasis. Furthermore, in patients without distant metastasis at the time of presentation, the presence of CD26(+) cells in their primary tumors predicted distant metastasis on follow-up. Isolated CD26(+) cells, but not CD26(-) cells, led to development of distant metastasis when injected into the mouse cecal wall. CD26(+) cells were also associated with enhanced invasiveness and chemoresistance. Our findings have uncovered a critical role of CSCs in metastatic progression of cancer. Furthermore, the ability to predict metastasis based on analysis of CSC subsets in the primary tumor may have important clinical implication as a selection criterion for adjuvant therapy.
Collapse
Affiliation(s)
- Roberta Pang
- Department of Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Zhang W, Yang Y, Jiang B, Peng J, Tu S, Sardet C, Zhang Y, Pang R, Hung IF, Tan VPY, Lam CSC, Wang J, Wong BC. XIAP-associated factor 1 interacts with and attenuates the trans-activity of four and a Half LIM protein 2. Mol Carcinog 2010; 50:199-207. [DOI: 10.1002/mc.20705] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2010] [Revised: 09/14/2010] [Accepted: 10/18/2010] [Indexed: 11/11/2022]
|
42
|
Affiliation(s)
- Thomas Yau
- The University of Hong Kong, Queen Mary Hospital, Department of Medicine, Hong Kong
| | - Roberta Pang
- The University of Hong Kong, Queen Mary Hospital, Department of Medicine, Hong Kong
| | - Pierre Chan
- The University of Hong Kong, Queen Mary Hospital, Department of Medicine, Hong Kong
| | - Ronnie T Poon
- The University of Hong Kong, Queen Mary Hospital, Department of Surgery, 102 Pokfulam Road, Hong Kong ;
| |
Collapse
|
43
|
Ma J, Wang JD, Zhang WJ, Zou B, Chen WJ, Lam CSC, Chen MH, Pang R, Tan VPY, Hung IF, Lan HY, Wang QY, Wong BCY. Promoter hypermethylation and histone hypoacetylation contribute to pancreatic-duodenal homeobox 1 silencing in gastric cancer. Carcinogenesis 2010; 31:1552-60. [PMID: 20622005 DOI: 10.1093/carcin/bgq140] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND AND AIMS The expression of pancreatic-duodenal homeobox 1 (PDX1) in gastric cancer is aberrantly reduced. The aim of this study was to elucidate the regulation of DNA methylation and histone acetylation at the promoter for PDX1 silencing in gastric cancer. METHODS PDX1 expression in response to demethylation and acetylation was detected in human gastric cancer cell lines by reverse transcription-polymerase chain reaction (PCR) and western blot. Four CpG islands within the 5'-flanking region of PDX1 gene were analyzed with their transcription activities being detected by dual luciferase assay. Promoter hypermethylation was identified in gastric cancer cell lines and cancer tissues by methylation-specific PCR or bisulfite DNA sequencing PCR analysis. Histone acetylation was determined by chromatin immunoprecipitation (ChIP) assay. RESULTS Demethylation by 5'-aza-2'-deoxycytidine (5'-aza-dC) and/or acetylation by trichostatin A (TSA) restored PDX1 expression in gastric cancer cells. Hypermethylation was found in four CpG islands in six of seven cancer cell lines. However, only the distal CpG island located in the promoter fragment of PDX1, F383 (c.-2063 to -1681 nt upstream of the ATG start codon) displayed significant transcriptional activity that could be suppressed by SssI methylase and increased by 5'-aza-dC and TSA. More than 70% of the single CpG sites in F383 were methylated with hypermethylation of F383 fragment more common in gastric cancerous tissues compared with the paired normal tissues (P < 0.05). ChIP assay showed F383 was also associated with low hypoacetylation level of the histones. CONCLUSION Promoter hypermethylation and histone hypoacetylation contribute to PDX1 silencing in gastric cancer.
Collapse
Affiliation(s)
- Juan Ma
- Department of Gastroenterology and Hepatology, Guangdong General Hospital, Guangzhou 510080, China
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Yau CC, Chan P, Pang R, Chan W, Cheng PN, Poon R. A phase I study of recombinant human arginase I (rhArgI) for patients with advanced hepatocellular carcinoma. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e13503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
45
|
Zhang W, Jiang B, Guo Z, Sardet C, Zou B, Lam CSC, Li J, He M, Lan HY, Pang R, Hung IFN, Tan VPY, Wang J, Wong BCY. Four-and-a-half LIM protein 2 promotes invasive potential and epithelial-mesenchymal transition in colon cancer. Carcinogenesis 2010; 31:1220-9. [DOI: 10.1093/carcin/bgq094] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
|
46
|
Abstract
BACKGROUND AND AIM The incidence of colorectal cancer (CC) is increasing in many Asian countries, but decreasing in western countries. The present study examined the local incidence of CC in the past few decades. METHODS A population based study, using data from Hong Kong (HK) Cancer Registry, was carried out to examine the trends of CC in different age groups in HK. Comparison with other countries was made. RESULTS The crude rate of CC in HK increased from 29.6/100,000 in 1983 to 57.1/100,000 in 2006. Age standardized rate (ASR) increased by less than 20%. It was markedly smaller than the 190% increase in crude rate. ASR progressively increased in males. In females, ASR peaked in 1994 and declined in the last decade. In most countries, the risk of CC was higher and increasing in males, but stable or decreasing in females. With respect to age, increasing risk was noted in males above 60 years old and females above 70 years old. However, a declining rate was noted in those below 50 years old. The decrease was over 40% in the 30-34 years group over the past two decades. CONCLUSIONS Increasing incidence of CC in HK was mostly in the older and male population, but not in the younger age group.
Collapse
Affiliation(s)
- Yuk Kei Yee
- HK Health Enhancement Research Centre, The University of Hong Kong, Hong Kong
| | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Ng EK, Leung C, Au S, Chan A, Wong C, Ma E, Pang R, Chua D, Chu KM, Law WL, Poon RTP, Kwong A. Abstract 3027: Plasma microRNA as a potential marker for breast cancer detection. Cancer Res 2010. [DOI: 10.1158/1538-7445.am10-3027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Recently, the emergence of small non-protein-coding RNAs, so-called microRNAs (miRNAs), playing important roles in oncogenesis has opened new opportunities for early cancer diagnosis. We have previously shown that microRNAs (miRNAs) in plasma are promising biomarkers for colorectal cancer detection. Here, we investigated whether plasma miRNAs could discriminate patients with and without breast cancer (BC).
Methods: Using TaqMan-based low density miRNA array, miRNAs were profiled from cancerous and adjacent non-cancerous breast tissues, corresponding plasma of 5 BC patients, along with plasma from 5 healthy controls. Marker selection and validation were performed by real-time quantitative RT-PCR on a small set of plasma. Independent set of plasma from 80 BC patients, 20 gastric cancer, 20 lung cancer, 20 colorectal cancer, 20 hepatocellular carcinoma and 50 healthy controls were further validated.
Results: Of the panel of 377 miRNAs analyzed, 8 miRNAs (miR-16, miR-21, miR-27a, miR-141, miR-191, miR-200c, miR-210, miR-451) were up-regulated both in plasma and tissue samples of 5 BC patients. All 8 putative miRNA markers were validated on the plasma of 15 BC patients and 15 healthy controls. Only three miRNAs were significantly elevated in this cohort of BC patients (p<0.0005). The plasma levels of the three markers in those 15 BC patients were significantly reduced after surgery (p<0.05). Further validation with an independent set of plasma samples (n=210) indicated that two markers differentiate BC from normal subjects, colorectal cancer, gastric cancer, hepatocellular carcinoma and lung cancer. These two markers yielded a combined receiver operating characteristic curve area of 88.5%, the sensitivity was 92% and the specificity was 72% in discriminating BC from control subjects.
Conclusions: Plasma miRNAs significantly elevated in BC patients are identified. This can be a novel noninvasive molecular marker for BC screening.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 101st Annual Meeting of the American Association for Cancer Research; 2010 Apr 17-21; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2010;70(8 Suppl):Abstract nr 3027.
Collapse
Affiliation(s)
| | - Candy Leung
- 1The University of Hong Kong, Pokfulam, Hong Kong
| | - Stephanie Au
- 1The University of Hong Kong, Pokfulam, Hong Kong
| | - Aaron Chan
- 1The University of Hong Kong, Pokfulam, Hong Kong
| | - Chris Wong
- 2Hong Kong Sanatorium & Hospital, Hong Kong Island, Hong Kong
| | - Edmond Ma
- 2Hong Kong Sanatorium & Hospital, Hong Kong Island, Hong Kong
| | - Roberta Pang
- 1The University of Hong Kong, Pokfulam, Hong Kong
| | - Daniel Chua
- 1The University of Hong Kong, Pokfulam, Hong Kong
| | - KM Chu
- 1The University of Hong Kong, Pokfulam, Hong Kong
| | - WL Law
- 1The University of Hong Kong, Pokfulam, Hong Kong
| | | | - Ava Kwong
- 1The University of Hong Kong, Pokfulam, Hong Kong
| |
Collapse
|
48
|
Cheng CW, Pang R, Fok E, Kwong YL, Tse E. Abstract 1212: PIN1 enhances the anti-apoptotic function of survivin in cancer cells. Cancer Res 2010. [DOI: 10.1158/1538-7445.am10-1212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Introduction: The peptidyl prolyl cis/trans isomerase 1 (PIN1) binds the specific motif comprising a phosphorylated serine or threonine residue preceding a proline (pSer/Thr-Pro) in proteins. PIN1 catalyses isomerisation of the prolyl peptide bond, and subsequently induces conformational changes in the substrates and modulates their functions. Through this mechanism, PIN1 is involved in many cellular events, including cell cycle progression, cell proliferation and cell transformation. Our previous work has revealed that PIN1 is over-expressed in hepatocellular carcinomas (HCC) and enhances hepatocarinogenesis. In this study, we investigated the role of the interaction between PIN1 and Survivin, an inhibitor of apoptosis protein (IAP), in tumorigenesis.
Methods and Results: By co-immunoprecipitation experiments, we found that PIN1 interacted with Survivin via the phosphorylated Thr34-pro motif in Survivin. We then further investigated the effects of PIN1 on the anti-apoptotic function of Survivin using flow cytometry by staining the cells with Annexin V and 7-AAD. Both caspase-9 and caspase-3 activities were also detected by flow cytometry. Through these experiments, over-expression of PIN1 in cervical carcinoma HeLa and human nontumorigenic liver MIHA cells were found to suppress the apoptotic response induced by staurosporine through inactivation of caspase-9 and caspase-3. However, the expression of the PIN1 mutants that are catalytically inactive or defective for protein-binding activity did not result in an inhibition of apoptosis. Likewise, the targeted inhibition of PIN1 by small interfering RNA in HeLa and human hepatoma PLC/PRF/5 cells enhanced the apoptotic response induced by staurosporine through caspase-9 and caspase-3 activation. In addition, down-regulation of Survivin by small interfering RNA in PIN1 over-expressing cells abolished the anti-apoptotic effect induced by PIN1, suggesting that the inhibition of apoptosis is mediated through the PIN1-Survivin interaction.
Conclusion: Since phosphorylation of Thr34 in Survivin suppresses pro-caspase-9 activation by increasing the binding between Survivin and pro-caspase-9, our results suggest that PIN1 may further regulate the anti-apoptotic role of Survivin through modulation of its binding to pro-caspase-9.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 101st Annual Meeting of the American Association for Cancer Research; 2010 Apr 17-21; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2010;70(8 Suppl):Abstract nr 1212.
Collapse
Affiliation(s)
| | | | - Elaine Fok
- 1University of Hong Kong, HKSAR, Hong Kong
| | | | - Eric Tse
- 1University of Hong Kong, HKSAR, Hong Kong
| |
Collapse
|
49
|
Pang R, Zhang Y, Pan X, Gu R, Hou X, Xiang P, Liu Z, Zhu X, Hu J, Zhao J, Zhang C. Embryonic-like stem cell derived from adult bone marrow: immature morphology, cell surface markers, ultramicrostructure and differentiation into multinucleated fibers in vitro. Cell Mol Biol (Noisy-le-grand) 2010; 56 Suppl:OL1276-OL1285. [PMID: 20385079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2009] [Accepted: 02/15/2010] [Indexed: 05/29/2023]
Abstract
Embryonic-like stem cell (ELSC), expressing part of surface markers of human embryonic stem cells, may be a better candidate for cell therapy of degenerative muscular disease than mesenchymal stem cell (MSC). We isolated ELSC and MSC from bone marrow, respectively, and compared their differences in the characteristics and the capacity of myogenic differentiation. Results showed that ELSC could be isolated successfully from 3 adult bone marrow samples by using serum-free medium with 10ng/ml basic fibroblast growth factor (bFGF). At the same cell density, MSC could also be isolated from the same samples by using DMEM/F12 medium containing 10% new cattle serum. However, ELSC appeared as small, morphologically slenderer, upregulated expression of SSEA-4 and ultramicroscopically more immature than MSC derived from the same samples. Immunofluorescent staining and RT-PCR analysis showed ELSC weakly expressed Oct-4, Nanog-3 and Sox-2. Moreover, ELSC and MSC could be induced into long, multinucleated fibers expressing myogenin and myosin heavy chain (MHC) in myogenic differentiation medium, but by day 10, proportion of multinucleated fibers positive for MHC was respectively 25.0%+/-6.9% and 13.8%+/-7.6% in ELSC and MSC culture. These data suggest that bone marrow derived ELSC represent an ideal candidate for cell therapy of degenerative muscular disease.
Collapse
Affiliation(s)
- R Pang
- Department of Neurology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, P.R. China.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Tan VPY, Chan P, Hung IFN, Pang R, Wong BCY. Chemoprophylaxis in colorectal cancer: current concepts and a practical algorithm for use. Expert Opin Investig Drugs 2010; 19 Suppl 1:S57-66. [DOI: 10.1517/13543781003714923] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|