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Chia B, Ng W, Yap S, Chua K, Yip C, Thiagarajan A, Siow T, Fong K. P3.08-07 An Institution Review of Outcomes of Lung Stereotactic Body Radiotherapy in Various Oligometastatic Disease States. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Sharma SK, Yip C, Esposito EX, Sharma PV, Simon MP, Abel-Santos E, Firestine SM. The Design, Synthesis, and Characterizations of Spore Germination Inhibitors Effective against an Epidemic Strain of Clostridium difficile. J Med Chem 2018; 61:6759-6778. [PMID: 30004695 DOI: 10.1021/acs.jmedchem.8b00632] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Clostridium difficile infections (CDI), particularly those caused by the BI/NAP1/027 epidemic strains, are challenging to treat. One method to address this disease is to prevent the development of CDI by inhibiting the germination of C. difficile spores. Previous studies have identified cholic amide m-sulfonic acid, CamSA, as an inhibitor of spore germination. However, CamSA is inactive against the hypervirulent strain R20291. To circumvent this problem, a series of cholic acid amides were synthesized and tested against R20291. The best compound in the series was the simple phenyl amide analogue which possessed an IC50 value of 1.8 μM, more than 225 times as potent as the natural germination inhibitor, chenodeoxycholate. This is the most potent inhibitor of C. difficile spore germination described to date. QSAR and molecular modeling analysis demonstrated that increases in hydrophobicity and decreases in partial charge or polar surface area were correlated with increases in potency.
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Santoni N, Yip C, Chew B. Can we still deliver a safe day case plastic surgery service at a modern ambulatory care hospital (ACH) after seven years? A re-audit of a single surgeon’s series. Int J Surg 2018. [DOI: 10.1016/j.ijsu.2018.05.461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Khin N, Peh W, Tham W, Lam W, Wang M, Siow T, Lim F, Tan D, Chin F, Chua E, Wang F, Ho S, Yip C. Biochemical and radiological inflammatory markers in oesophageal squamous cell carcinoma treated with radical chemoradiation. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy151.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Foidart P, Yip C, Radermacher J, Collignon J, Coibion M, Blacher S, Marangoni E, Sounni N, Noël A, Jerusalem G. PO-524 MT4-MMP, EGFR and Rb expressions are predictive biomarkers of response to erlotinib-palbociclib combination in TNBC. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.1025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Lindsay M, Goia C, Yip C. Strategic Framework for Monitoring the Quality of Heart and Brain Care in Canada. Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.01.066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Le Dévédec F, Her S, Vogtt K, Won A, Li X, Beaucage G, Yip C, Allen C. Drug governs the morphology of polyalkylated block copolymer aggregates. NANOSCALE 2017; 9:2417-2423. [PMID: 27935620 DOI: 10.1039/c6nr08215g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Polyalkylated copolymers based on mPEG-b-(AGE-C6,12 or 18)25 have been used to formulate clinically relevant concentrations of doxorubicin (DOX) and the impact of drug incorporation on copolymer aggregation behaviour was examined. The copolymer aggregates were analyzed by various microscopy techniques (TEM, cryo-TEM and AFM) and scattering methods (SANS, DLS). In the absence of the drug, the copolymers formed largely non-spherical aggregates (i.e. cylinders, vesicles). Drug incorporation during copolymer aggregate formation directed the formation of only spherical aggregates. As well, the nature of the core-forming block was found to influence drug release and cytotoxicity of the formulations.
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Yeo W, Mo F, Suen J, Loong H, Pang E, Yip C, Liem G. Dyslipidaemias after adjuvant chemotherapy in young Chinese breast cancer patients. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw364.57] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yip C. Review Section: The Production of Knowledge: The Challenge of Social Science Research WILLIAM H. STARBUCK. New York: Oxford University Press Inc., 2006. 194 pp. ISBN 0199288534. MANAGEMENT LEARNING 2016. [DOI: 10.1177/13505076070380030804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Yip C, Weeks A, Cook G, Landau D, Goh V. PO-0989: Hypoxic and perfusion effects of Trastuzumab in a HER2+ oesophageal adenocarcinoma xenograft model. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32239-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Chang A, Cheung F, Wong T, Wong E, Cho F, Yip C, Soong I, Law A, Lee M, Yeung R. PO-0963: Effectiveness of week 5 MRI virtual preplanning for Image-Guided Brachytherapy for cervical cancers. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32213-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Yip C, Ignjatovic V, Attard C, Karlaftis V, Linden M, Monagle P, Jimenez-Fonseca P. Removal notice to “Characterisation of the Age-Specific Differences in Platelet Physiology and Function” [Thromb. Res. 133 (2014) S91]. Thromb Res 2015. [DOI: 10.1016/j.thromres.2015.09.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mahajan A, Cook G, Goh V, Yip C, Siddique MM. Effects of body composition as measured by CT on clinical outcomes in patients with oesophageal cancer. Cancer Imaging 2015. [PMCID: PMC4601823 DOI: 10.1186/1470-7330-15-s1-p25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Jennings W, Doshi S, Won A, Yip C, Epand R. Mammalian Diacylglycerol Kinase Epsilon: Expression in Sf21 Cells, Purification, and Characterization. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.895.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Yip C, Davnall F, Kozarski R, Landau DB, Cook GJR, Ross P, Mason R, Goh V. Assessment of changes in tumor heterogeneity following neoadjuvant chemotherapy in primary esophageal cancer. Dis Esophagus 2015; 28:172-9. [PMID: 24460831 DOI: 10.1111/dote.12170] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
To assess the changes in computed tomography (CT) tumor heterogeneity following neoadjuvant chemotherapy in esophageal cancer. Thirty-one consecutive patients who received neoadjuvant chemotherapy for esophageal cancer were identified. Analysis of primary tumor heterogeneity (texture) was performed on staging and post-chemotherapy CT scans. Image texture parameters (mean grey-level intensity, entropy, uniformity, kurtosis, skewness, standard deviation of histogram) were derived for different levels of image filtration (0-2.5). Proportional changes in each parameter following treatment were obtained. Comparison between pathological tumor response and texture parameters was analyzed using Mann-Whitney U-test. The relationship between CT texture and overall survival) was estimated using the Kaplan-Meier method. Tumor texture became more homogeneous after treatment with a significant decrease in entropy and increase in uniformity (filter 1.0 and 2.5). Pretreatment (filter 1.5, P = 0.006) and posttreatment standard deviation of histogram (filter 1.0, P = 0.009) showed a borderline association with pathological tumor response. A proportional change in skewness <0.39 (filter 1.0) was associated with improved survival (median overall survival 36.1 vs. 11.1 months; P < 0.001). CT tumor heterogeneity decreased following neoadjuvant chemotherapy and has the potential to provide additional information in primary esophageal cancer.
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Yip C, Cook GJR, Landau DB, Davies A, Goh V. Performance of different imaging modalities in assessment of response to neoadjuvant therapy in primary esophageal cancer. Dis Esophagus 2015; 29:116-30. [PMID: 25604614 DOI: 10.1111/dote.12315] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Yip C, Chew BK. A simple technique for reinflating a Becker expander when tube breakage occurs during port removal. J Plast Reconstr Aesthet Surg 2014; 67:1599-600. [PMID: 24934097 DOI: 10.1016/j.bjps.2014.05.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 05/20/2014] [Indexed: 11/30/2022]
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Yip C, Ignjatovic V, Attard C, Karlaftis V, Linden M, Monagle P, Jimenez-Fonseca P. REMOVED: Characterisation of the Age-Specific Differences in Platelet Physiology and Function. Thromb Res 2014. [DOI: 10.1016/s0049-3848(14)50293-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Heedy S, Lo M, Dillon E, Hu Q, Prater C, Shetty R, Kjoller K, Marcott C, Dazzi A, Yip C. Chemical Analysis Below the Diffraction Limit using Infrared-Coupled Atomic Force Microscopy (AFM-IR). Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.1203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Yip C, Thomas C, Michaelidou A, James D, Lynn R, Lei M, Guerrero Urbano T. Co-registration of cone beam CT and planning CT in head and neck IMRT dose estimation: a feasible adaptive radiotherapy strategy. Br J Radiol 2013; 87:20130532. [PMID: 24288402 DOI: 10.1259/bjr.20130532] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE To investigate if cone beam CT (CBCT) can be used to estimate the delivered dose in head and neck intensity-modulated radiotherapy (IMRT). METHODS 15 patients (10 without replan and 5 with replan) were identified retrospectively. Weekly CBCT was co-registered with original planning CT. Original high-dose clinical target volume (CTV1), low-dose CTV (CTV2), brainstem, spinal cord, parotids and external body contours were copied to each CBCT and modified to account for anatomical changes. Corresponding planning target volumes (PTVs) and planning organ-at-risk volumes were created. The original plan was applied and calculated using modified per-treatment volumes on the original CT. Percentage volumetric, cumulative (planned dose delivered prior to CBCT + adaptive dose delivered after CBCT) and actual delivered (summation of weekly adaptive doses) dosimetric differences between each per-treatment and original plan were calculated. RESULTS There was greater volumetric change in the parotids with an average weekly difference of between -4.1% and -27.0% compared with the CTVs/PTVs (-1.8% to -5.0%). The average weekly cumulative dosimetric differences were as follows: CTV/PTV (range, -3.0% to 2.2%), ipsilateral parotid volume receiving ≥26 Gy (V26) (range, 0.5-3.2%) and contralateral V26 (range, 1.9-6.3%). In patients who required replan, the average volumetric reductions were greater: CTV1 (-2.5%), CTV2 (-6.9%), PTV1 (-4.7%), PTV2 (-11.5%), ipsilateral (-10.4%) and contralateral parotids (-12.1%), but did not result in significant dosimetric changes. CONCLUSION The dosimetric changes during head and neck simultaneous integrated boost IMRT do not necessitate adaptive radiotherapy in most patients. ADVANCES IN KNOWLEDGE Our study shows that CBCT could be used for dose estimation during head and neck IMRT.
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Yip C, Landau D, Thomas C, Ahmad S. 171 Stereotactic ablative radiotherapy (SABR) in medically inoperable early stage non-small cell lung cancer (NSCLC): A single tertiary UK centre experience. Lung Cancer 2013. [DOI: 10.1016/s0169-5002(13)70171-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Yip C, Michaelidou A, Thomas R, Goh V, Landau D. CT Prognostication in Esophageal Cancer Treated With Definitive Chemoradiation Is Still Relevant. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yip C, Landau D, Ahmad S, Goh V, Siddique M, Chicklore S, Roy A, Cook G. Pretreatment FDG PET Tumor Heterogeneity in Non-small Cell Lung Cancer is Associated With Poor Response and Survival Following Chemoradiation Therapy. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.1474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Yip C, Liu D, Lobie PE, Perry JK. P4-02-05: The Regulation of Artemin Signalling by IGF-1 in Mammary Carcinoma Cells. Cancer Res 2011. [DOI: 10.1158/0008-5472.sabcs11-p4-02-05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Artemin is a neurotrophic signalling factor which belongs to the glial-derived neurotrophic factor (GDNF) family of ligands. Artemin acts as a survival, proliferation and migration factor for a number of neurological cell types, by signalling through the RET (rearranged during transfection) receptor and, in most cases, the GDNF receptor (GFR)-a3 co-receptor. Recently, a number of published studies have implicated Artemin as a potential oncogene in several cell types, including mammary carcinoma cells. Other studies further indicate that Artemin may influence cancer progression and tamoxifen resistance in some breast cancers. Available clinical data has demonstrated that increased Artemin expression is correlated with decreased overall patient survival in breast cancer patients and a poor outcome in tamoxifen treated breast cancer patients. Here we investigate interaction between the Artemin and the insulin-like growth factor-1 (IGF-1) signal transduction pathways. Using mammary carcinoma cell lines, we demonstrate that IGF-1 treatment increases the endogenous expression of both Artemin and its endogenous receptors, RET and GFRa3. Semi-quantitative RT-PCR assays demonstrated that IGF-1 stimulated mRNA expression of Artemin as well as RET and GFRa3 in wild-type MCF-7 and ZR-75-1 cells in a time-dependent and dose-dependent manner. The same effect was not observed in wild-type T47D cells where IGF-1 did not increase Artemin mRNA expression.
We also demonstrated that forced expression of Artemin in MCF-7 cells consistently enhanced the response of these cells to IGF-1 in a number of cell function assays. Forced expression of Artemin significantly enhanced IGF-1-mediated stimulation of total cell number in MCF-7 cells. Consistent with this, Artemin enhanced IGF-1-mediated stimulation of S-phase entry and cell survival. In a soft agar assay, forced expression of Artemin also enhanced IGF-1-mediated stimulation of colony formation. Conversely, depletion of Artemin expression using siRNA abrogated the response to IGF-1 stimulation in MCF-7 cells. Artemin depletion significantly decreased IGF-1-stimulated increase in total cell number by decreasing IGF-1-stimulated cell proliferation and protection from apoptotic cell death. In addition, forced expression of Artemin in MCF-7 cells reduced cell sensitivity to the IGF-1 receptor small molecule inhibitor, AG1024. In conclusion, we have demonstrated that IGF-1 increases Artemin mRNA and protein expression in the breast cancer cell lines MCF-7 and ZR-75-1 and have identified potential cross-talk between the Artemin and IGF-1 signalling pathways in MCF-7 cells.
Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P4-02-05.
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Yip C, Cheng H, Cheung F, Chan C. SU-E-T-89: Comparison of a Liquid Ionization Chamber with a Diamond Detector for Relatively Small Photon Field Measurements. Med Phys 2011. [DOI: 10.1118/1.3612040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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