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Silver A, Ho C, Ye Q, Zhang J, Janzen I, Li J, Martin M, Wu L, Wang Y, Lam S, MacAulay C, Melosky B, Yuan R. Prediction of Disease Progression to Upfront Pembrolizumab Monotherapy in Advanced Non-Small-Cell Lung Cancer with High PD-L1 Expression Using Baseline CT Disease Quantification and Smoking Pack Years. Curr Oncol 2023; 30:5546-5559. [PMID: 37366902 DOI: 10.3390/curroncol30060419] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 06/03/2023] [Accepted: 06/06/2023] [Indexed: 06/28/2023] Open
Abstract
Health Canada approved pembrolizumab in the first-line setting for advanced non-small-cell lung cancer with PD-L1 ≥ 50% and no EGFR/ALK aberration. The keynote 024 trial showed 55% of such patients progress with pembrolizumab monotherapy. We propose that the combination of baseline CT and clinical factors can help identify those patients who may progress. In 138 eligible patients from our institution, we retrospectively collected their baseline variables, including baseline CT findings (primary lung tumor size and metastatic site), smoking pack years, performance status, tumor pathology, and demographics. The treatment response was assessed via RECIST 1.1 using the baseline and first follow-up CT. Associations between the baseline variables and progressive disease (PD) were tested by logistic regression analyses. The results showed 46/138 patients had PD. The baseline CT "number of involved organs" by metastasis and smoking pack years were independently associated with PD (p < 0.05), and the ROC analysis showed a good performance of the model that integrated these variables in predicting PD (AUC: 0.79). This pilot study suggests that the combination of baseline CT disease and smoking PY can identify who may progress on pembrolizumab monotherapy and can potentially facilitate decision-making for the optimal first-line treatment in the high PD-L1 cohort.
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Affiliation(s)
- Ali Silver
- Department of Radiology, Faculty of Medicine, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
| | - Cheryl Ho
- BC Cancer, Vancouver Center, 600 West 10th Avenue, Vancouver, BC V5Z 4E6, Canada
- Department of Medical Oncology, Faculty of Medicine, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
| | - Qian Ye
- Department of Statistics, Faculty of Science, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
| | - Jianjun Zhang
- Department of Thoracic/Head and Neck Medical Oncology, MD Anderson Cancer Center, The University of Texas, Houston, TX 77030, USA
| | - Ian Janzen
- Integrative Oncology, BC Cancer Research Centre, 675 West 10th Avenue Vancouver, BC V5Z 1L3, Canada
| | - Jessica Li
- Department of Radiology, Faculty of Medicine, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
| | - Montgomery Martin
- Department of Radiology, Faculty of Medicine, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
- BC Cancer, Vancouver Center, 600 West 10th Avenue, Vancouver, BC V5Z 4E6, Canada
| | - Lang Wu
- Department of Statistics, Faculty of Science, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
| | - Ying Wang
- BC Cancer, Vancouver Center, 600 West 10th Avenue, Vancouver, BC V5Z 4E6, Canada
- Department of Medical Oncology, Faculty of Medicine, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
| | - Stephen Lam
- BC Cancer, Vancouver Center, 600 West 10th Avenue, Vancouver, BC V5Z 4E6, Canada
- Integrative Oncology, BC Cancer Research Centre, 675 West 10th Avenue Vancouver, BC V5Z 1L3, Canada
- Department of Respirology, Faculty of Medicine, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
| | - Calum MacAulay
- Integrative Oncology, BC Cancer Research Centre, 675 West 10th Avenue Vancouver, BC V5Z 1L3, Canada
| | - Barbara Melosky
- BC Cancer, Vancouver Center, 600 West 10th Avenue, Vancouver, BC V5Z 4E6, Canada
- Department of Medical Oncology, Faculty of Medicine, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
| | - Ren Yuan
- Department of Radiology, Faculty of Medicine, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
- BC Cancer, Vancouver Center, 600 West 10th Avenue, Vancouver, BC V5Z 4E6, Canada
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Yuan R, Silver A, Ye M, Ho C, Zhang J, Wang Y, Wu L, Martin M, Lam S, MacAulay C, Melosky B. EP08.01-075 Combination of Baseline Disease and Smoking Pack-Years Can Guide The 1st-line Treatment Decision in Advanced NSCLC with High PD-L1 Expression. J Thorac Oncol 2022. [DOI: 10.1016/j.jtho.2022.07.647] [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: 10/14/2022]
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3
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McLaren AAD, Newton EJ, Silver A, Allan MR, Middel KR, Pond BA, Patterson BR. Too many to count: Using orthophotography to census an unharvested beaver (
Castor canadensis
) population in Ontario. Ecosphere 2022. [DOI: 10.1002/ecs2.4185] [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: 11/07/2022] Open
Affiliation(s)
- A. A. D. McLaren
- Ontario Ministry of Natural Resources and Forestry (OMNRF), Wildlife Research and Monitoring Section Trent University Peterborough Ontario Canada
| | - E. J. Newton
- Ontario Ministry of Natural Resources and Forestry (OMNRF), Wildlife Research and Monitoring Section Trent University Peterborough Ontario Canada
| | - A. Silver
- Ontario Ministry of Natural Resources and Forestry (OMNRF), Wildlife Research and Monitoring Section Trent University Peterborough Ontario Canada
| | - M. R. Allan
- Ontario Ministry of Natural Resources and Forestry (OMNRF), Wildlife Research and Monitoring Section Trent University Peterborough Ontario Canada
| | - K. R. Middel
- Ontario Ministry of Natural Resources and Forestry (OMNRF), Wildlife Research and Monitoring Section Trent University Peterborough Ontario Canada
| | - B. A. Pond
- Ontario Ministry of Natural Resources and Forestry (OMNRF), Wildlife Research and Monitoring Section Trent University Peterborough Ontario Canada
| | - B. R. Patterson
- Ontario Ministry of Natural Resources and Forestry (OMNRF), Wildlife Research and Monitoring Section Trent University Peterborough Ontario Canada
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Silver A, Walsleben M, ReziKato T, Dierick K. Health care economic evaluation of fill and finish system in cell and gene therapy manufacturing. Cytotherapy 2021. [DOI: 10.1016/s1465324921005995] [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: 11/17/2022]
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5
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Silver A, Murray M. The Kinetics of Inhibition of the Action of Thrombin by the Fibrinopeptides Formed during the Clotting of Fibrinogen. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1655562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
SummaryVarious investigators have separated the coagulation products formed when fibrinogen is clotted with thrombin and identified fibrinopeptides A and B. Two other peaks are observed in the chromatogram of the products of coagulation, but these have mostly been dismissed by other workers. They have been identified by us as amino acids, smaller peptides and amorphous material (37). We have re-chromatographed these peaks and identified several amino acids. In a closed system of fibrinogen and thrombin, the only reaction products should be fibrin and peptide A and peptide B. This reasoning has come about because thrombin has been reported to be specific for the glycyl-arginyl peptide bond. It is suggested that thrombin also breaks other peptide linkages and the Peptide A and Peptide B are attacked by thrombin to yield proteolytic products. Thrombin is therefore probably not specific for the glycyl-arginyl bond but will react on other linkages as well.If the aforementioned is correct then the fibrinopeptides A and B would cause an inhibition with the coagulation mechanism itself. We have shown that an inhibition does occur. We suggest that there is an autoinhibition to the clotting mechanism that might be a control mechanism in the human body.The experiment was designed for coagulation to occur under controlled conditions of temperature and time. Purified reactants were used. We assembled an apparatus to record visually the speed of the initial reaction, the rate of the reaction, and the density of the final clot formed after a specific time.The figures we derived made available to us data whereby we could calculate and plot the information to show the mechanism and suggest that such an inhibition does exist and also further suggest that it might be competitive.In order to prove true competitive inhibition it is necessary to fulfill the criteria of the Lineweaver-Burk plot. This has been done. We have also satisfied other criteria of Dixon (29) and Bergman (31) that suggest true competitive inhibition.
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Kataria V, Yamani N, Alimohamed M, Silver A, Saha N, Mohamedali B. Marital Status Predicts Hospital Length of Stay in Patients with Congestive Heart Failure Exacerbation. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.556] [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: 10/19/2022] Open
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Felice C, Lewis A, Armuzzi A, Lindsay JO, Silver A. Review article: selective histone deacetylase isoforms as potential therapeutic targets in inflammatory bowel diseases. Aliment Pharmacol Ther 2015; 41:26-38. [PMID: 25367825 DOI: 10.1111/apt.13008] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [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: 06/30/2014] [Revised: 07/22/2014] [Accepted: 10/10/2014] [Indexed: 02/06/2023]
Abstract
BACKGROUND A link between histone deacetylases (HDACs) and intestinal inflammation has been established. HDAC inhibitors that target gut-selective inflammatory pathways represent a potential new therapeutic strategy in patients with refractory inflammatory bowel diseases (IBD). AIMS To review the use of selective HDAC inhibitors to treat gut inflammation and to highlight potential improvements in selectivity/sensitivity by additional targeting of HDAC-regulating microRNAs (miRNAs). METHODS Original articles and reviews have been identified using PubMed search terms: 'histone deacetylase', 'HDAC inhibitor', 'inflammatory bowel disease', 'gut inflammation,' and 'microRNA and HDAC'. RESULTS The use of butyrate in distal colitis provided the first evidence that inhibition of HDACs decreases intestinal inflammation in IBD. HDAC inhibitors, such as valproic acid, vorinostat and givinostat, reduce inflammation and tissue damage in experimental murine colitis. Potential mechanisms of action for HDAC inhibitors include increased apoptosis, reduction of pro-inflammatory cytokine release, regulation of transcription factors and modulation of HDAC-regulatory miRNAs. HDAC2, HDAC3, HDAC6, HDAC9 and HDAC10 isoforms seem to be specifically involved in chronic intestinal inflammation, justifying the use of selective inhibitors as new therapeutic strategies in IBD. Controlling miRNAs for these isoforms can be identified. CONCLUSIONS The pro-inflammatory influence of HDACs in the gut has been confirmed, but mostly in murine studies. Considerably more human data are required to permit development of selective HDAC inhibitors for IBD treatment. Inhibition of key HDAC isoforms in combination with modulation of HDAC-regulatory miRNAs has potential as a novel therapeutic approach.
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Affiliation(s)
- C Felice
- Centre for Digestive Diseases, Blizard Institute, Barts and the London School of Medicine and Dentistry, London, UK; IBD Unit, Internal Medicine and Gastroenterology, Complesso Integrato Columbus, Catholic University, Rome, Italy
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Stolz U, Vadeboncoeur T, Venturi M, Tobin J, Smith G, Nunez M, Silver A, Panchal A, Spaite D, Bobrow B. Increased Chest Compression Depth is Associated With Improved Survival from Out-of-Hospital Cardiac Arrest. Ann Emerg Med 2013. [DOI: 10.1016/j.annemergmed.2013.07.219] [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: 11/28/2022]
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9
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Cohen RI, Eichorn A, Silver A. Admission decisions to a medical intensive care unit are based on functional status rather than severity of illness. A single center experience. Minerva Anestesiol 2012; 78:1226-1233. [PMID: 22699698] [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] [Indexed: 06/01/2023]
Abstract
BACKGROUND Few data exist on Medical Intensive Care Unit (MICU) triage practices. We assessed MICU triage practices in our medical center. METHODS We collected data on all MICU consultations for one year, including each patient's APACHE II score at time of consultation. We assessed functional impairment at baseline and at time of MICU consultation. RESULTS A total of 54% out of 572 consultations resulted in admission. Patients were less likely to be admitted if baseline functional status was poor (OR, 0.29; 95% CI 0.17-0.50), if a do-not-resuscitate order was present (OR, 0.44; 95% CI, 0.21-0.89), and if the MICU attending spent more than 25% of professional time in MICU (OR, 2.44; 95% CI, 1.37-4.32). Patients were more likely to be admitted if functional status at time of MICU consultation was poor (OR, 2.30; 95% CI 1.46-3.48). Patients' age, insurance, ethnicity, severity of illness, presence of malignancy, or whether patient's primary physician was on staff were not independently associated with MICU admission decisions. MICU attendings rarely cited functional status as reason for MICU refusal on the consult forms. CONCLUSION MICU admission decisions are implicitly based on patients' baseline functional status rather than severity of illness.
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Affiliation(s)
- R I Cohen
- Division of Pulmonary, Critical Care and Sleep Medicine, New Hyde Park, NY, USA.
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10
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Dunne D, Silver A, Fieber J, Zeiss C, Fikrig E. O4-S2.05 Myd-88 deficient mice show evidence of productive T pallidum infection". Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050109.149] [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: 11/04/2022]
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11
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Eads JR, Albrecht TL, Egleston B, Buzaglo JS, Cohen RB, Fleisher L, Foster T, Katz M, Kinzy T, Manne S, Miller DM, Miller SM, Raivitch S, Roach N, Silver A, Meropol NJ. Identification of barriers to clinical trials: The impact of education level. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.6003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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12
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Abstract
Cerebellar involvement in systemic lupus erythematosus has rarely been described as one of the neurologic manifestations. There has been only one previous pediatric case of cerebellar edema reported in the literature. The differential diagnosis, magnetic resonance imaging findings and treatment modalities are described in the case of a 15-year-old girl who presented with headache, vomiting, unsteady gait, and sudden change in mental status.
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Affiliation(s)
- P. Krief
- Schneider Children's Hospital, New Hyde Park, New York, USA,
| | - A. Silver
- Virtua Hospital, Voorhees, New Jersey, USA
| | - A. Eberhard
- Schneider Children's Hospital, New Hyde Park, New York, USA
| | - J. Maytal
- Schneider Children's Hospital, New Hyde Park, New York, USA
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13
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Curtis JR, Arora T, Xi J, Silver A, Allison JJ, Chen L, Saag KG, Schenck A, Westfall AO, Colón-Emeric C. Do physicians within the same practice setting manage osteoporosis patients similarly? Implications for implementation research. Osteoporos Int 2009; 20:1921-7. [PMID: 19319619 PMCID: PMC2766011 DOI: 10.1007/s00198-009-0900-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2008] [Accepted: 02/03/2009] [Indexed: 10/21/2022]
Abstract
UNLABELLED Using data from long-term glucocorticoid users and long-term care residents, we evaluated osteoporosis prescribing patterns related to physician behavior and common practice settings. We found no significant clustering effect for common practice setting, suggesting that osteoporosis quality improvement (QI) efforts may be able to ignore this factor in designing QI interventions. INTRODUCTION Patients' receipt of prescription therapies are significantly influenced by their physician's prescribing patterns. If physicians in the same practice setting influence one another's prescribing, evidence implementation interventions must consider targeting the practice as well as individual physicians to achieve maximal success. METHODS We examined receipt of osteoporosis treatment (OP Rx) from two prior evidence implementation studies: long-term glucocorticoid (GC) users and nursing home (NH) residents with prior fracture or osteoporosis. Common practice setting was defined as doctors practicing at the same address or in the same nursing home. Alternating logistic regression evaluated the relationship between OP Rx, common practice setting, and individual physician treatment patterns. RESULTS Among 6,281 GC users in 1,296 practices, the proportion receiving OP Rx in each practice was 6-100%. Among 779 NH residents in 66 nursing homes, the proportion in each NH receiving OP Rx was 0-100%. In both, there was no significant relationship between receipt of OP Rx and common practice setting after accounting for treatment pattern of individual physicians. CONCLUSION Physicians practicing together were not more alike in prescribing osteoporosis medications than those in different practices. Osteoporosis quality improvement may be able to ignore common practice settings and maximize statistical power by targeting individual physicians.
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Affiliation(s)
- J R Curtis
- Center for Education and Research on Therapeutics, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
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Rasheed S, Harris AL, Tekkis PP, Turley H, Silver A, McDonald PJ, Talbot IC, Glynne-Jones R, Northover JMA, Guenther T. Erratum: Hypoxia-inducible factor-1α and -2α are expressed in most rectal cancers but only hypoxia-inducible factor-1α is associated with prognosis. Br J Cancer 2009. [PMCID: PMC2736827 DOI: 10.1038/sj.bjc.6605242] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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15
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Armstrong P, Silver A, Dawnay A, Grudzinskas JG, Chard T. Microalbuminuria in normal pregnancy: Relation to obstetric factors. J OBSTET GYNAECOL 2009. [DOI: 10.3109/01443618809151363] [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: 11/13/2022]
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16
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Rasheed S, Harris AL, Tekkis PP, Turley H, Silver A, McDonald PJ, Talbot IC, Glynne-Jones R, Northover JMA, Guenther T. Hypoxia-inducible factor-1alpha and -2alpha are expressed in most rectal cancers but only hypoxia-inducible factor-1alpha is associated with prognosis. Br J Cancer 2009; 100:1666-73. [PMID: 19436307 PMCID: PMC2696753 DOI: 10.1038/sj.bjc.6605026] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The hypoxia-mediated response of tumours is a major determining factor in growth and metastasis. Understanding tumour biology under hypoxic conditions is crucial for the development of antiangiogenic therapy. Using one of the largest cohorts of rectal adenocarcinomas to date, this study investigated hypoxia-inducible factor-1α (HIF-1α) and HIF-2α protein expression in relation to rectal cancer recurrence and cancer-specific survival. Patients (n=90) who had undergone surgery for rectal adenocarcinoma, with no prior neoadjuvant therapy or metastatic disease, and for whom adequate follow-up data were available were selected. Microvessel density (MVD), HIF-1α and HIF-2α expressions were assessed immunohistologically with the CD34 antibody for vessel identification and the NB100-131B and NB100-132D3 antibodies for HIF-1α and HIF-2α, respectively. In a multifactorial analysis, results were correlated with tumour stage, recurrence rate and long-term survival. Microvessel density was higher across T and N stages (P<0.001) and associated with poor survival (hazard ratio (HR)=8.7, P<0.005) and decreased disease-free survival (HR=4.7, P<0.005). hypoxia-inducible factor-1α and -2α were expressed in >50% of rectal cancers (HIF-1α, 54%, 48/90; HIF-2α, 64%, 58/90). HIF-1α positivity was associated with both TNM stage (P<0.05) and vascular invasion (P<0.005). In contrast, no associations were shown between HIF-2α expression and any pathological features, and HIF-1α positivity had no effect on outcome. The study showed an independent association between HIF-1α expression and advanced TNM stage with poor outcome. Our results indicate that HIF-1α, but not HIF-2α, might be used as a marker of prognosis, in addition to methods currently used, to enhance patient management.
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Affiliation(s)
- S Rasheed
- Department of Surgery, St Mark's Hospital, Harrow, Middlesex, UK
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Portnoy A, Pitsianis N, Sun X, Brady D, Gibbons R, Silver A, Te Kolste R, Chen C, Dillon T, Prather D. Design and characterization of thin multiple aperture infrared cameras. Appl Opt 2009; 48:2115-2126. [PMID: 19363550 DOI: 10.1364/ao.48.002115] [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: 05/27/2023]
Abstract
We describe a multiple-aperture long-wave infrared camera built on an uncooled microbolometer array with the objective of decreasing camera thickness. The 5 mm thick optical system is an f/1.2 design with a 6.15 mm effective focal length. An integrated image is formed from the subapertures using correlation-based registration and a least gradient reconstruction algorithm. We measure a 131 mK NETD. The system's spatial frequency is analyzed with 4 bar targets. With proper calibration, our multichannel interpolation results recover contrast for targets at frequencies beyond the aliasing limit of the individual subimages.
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Affiliation(s)
- A Portnoy
- Duke University, Durham, North Carolina 27708, USA
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18
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Rasheed S, Harris AL, Tekkis PP, Turley H, Silver A, McDonald PJ, Talbot IC, Glynne-Jones R, Northover JMA, Guenther T. Assessment of microvessel density and carbonic anhydrase-9 (CA-9) expression in rectal cancer. Pathol Res Pract 2008; 205:1-9. [PMID: 19008051 DOI: 10.1016/j.prp.2008.08.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2008] [Accepted: 08/29/2008] [Indexed: 11/30/2022]
Abstract
AIM The mechanism by which neoplasias respond to hypoxia determines their biological behavior and prognosis. Understanding the biology of tumors under hypoxic conditions is crucial for the development of anti-angiogenic therapy. Using the largest cohort of rectal adenocarcinomas to date, this study aimed to assess microvessel density (MVD) and carbonic anhydrase-9 (CA-9) expression and to correlate the results with recurrence and cancer-specific survival. MATERIALS AND METHODS Patients (n=101) who underwent surgery for rectal adenocarcinoma without previous neoadjuvant therapy or metastatic disease were selected. MVD and CA-9 expression were assessed immunohistologically by using the CD34 antibody and the MN/CA9 M75 antibody, respectively. In a multifactorial analysis, the results were correlated with tumor stage, recurrence rate, and long-term survival. RESULTS MVD was higher with increased T- and N-stages (p<0.01) and associated positively with poor survival (hazard ratio (HR) 1.3 per 10 vessel increase, p<0.01). CA-9 was expressed in 73% of cancers. Negative lymph node status correlated with CA-9 positivity (p<0.05), reflected in a higher rate of CA-9 positivity in earlier Dukes' stages (p<0.05). CA-9 positivity across tumor node metastasis (TNM) stages approached significance (Stage I/II: 80% CA-9 positive vs. 20% CA-9 negative; Stage III: 63% CA-9 positive vs. 37% negative, p=0.051). A trend was seen towards better cancer-specific survival in patients with CA-9 positive carcinomas (HR 0.51, p=0.07) on univariate analysis. DISCUSSION MVD was higher in more advanced T- and N-stages and may be used as a determinant of survival in patients with rectal adenocarcinomas. CA-9 expression was seen more often in earlier Dukes' stages, possibly representing an early tumor hypoxic response. CA-9 expression by adenocarcinoma cells may confer long-term survival advantage in surgically treated rectal cancer.
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Affiliation(s)
- S Rasheed
- Department of Surgery, St Mark's Hospital, Harrow, Middlesex, UK
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McCart A, Haines J, Suraweera N, Tomlinson I, Silver A. Characterisation of an intestinal neoplasm modifier locus in Apc Min mice. EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)71321-1] [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: 11/24/2022] Open
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20
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Carvajal-Carmona LG, Howarth KM, Lockett M, Polanco-Echeverry GM, Volikos E, Gorman M, Barclay E, Martin L, Jones AM, Saunders B, Guenther T, Donaldson A, Paterson J, Frayling I, Novelli MR, Phillips R, Thomas HJW, Silver A, Atkin W, Tomlinson IPM. Molecular classification and genetic pathways in hyperplastic polyposis syndrome. J Pathol 2007; 212:378-85. [PMID: 17503413 DOI: 10.1002/path.2187] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [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: 12/25/2022]
Abstract
Hyperplastic Polyposis (HPPS) is a poorly characterized syndrome that increases colorectal cancer (CRC) risk. We aimed to provide a molecular classification of HPPS. We obtained 282 tumours from 32 putative HPPS patients with >or= 10 hyperplastic polyps (HPs); some patients also had adenomas and CRCs. We found no good evidence of microsatellite instability (MSI) in our samples. The epithelium of HPs was monoclonal. Somatic BRAF mutations occurred in two-thirds of our patients' HPs, and KRAS2 mutations in 10%; both mutations were more common in younger cases. The respective mutation frequencies in a set of 'sporadic' HPs were 18% and 10%. Importantly, the putative HPPS patients generally fell into two readily defined groups, one set whose polyps had BRAF mutations, and another set whose polyps had KRAS2 mutations. The most plausible explanation for this observation is that there exist different forms of inherited predisposition to HPPS, and that these determine whether polyps follow a BRAF or KRAS2 pathway. Most adenomas and CRCs from our putative HPPS patients had 'classical' morphology and few of these lesions had BRAF or KRAS2 mutations. These findings suggest that tumourigenesis in HPPS does not necessarily follow the 'serrated' pathway. Although current definitions of HPPS are sub-optimal, we suggest that diagnosis could benefit from molecular analysis. Specifically, testing BRAF and KRAS2 mutations, and perhaps MSI, in multiple polyps could help to distinguish HPPS from sporadic HPs. We propose a specific model which would have diagnosed five more of our cases as HPPS compared with the WHO clinical criteria.
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Affiliation(s)
- L G Carvajal-Carmona
- Molecular and Population Genetics Laboratory, London Research Institute, Cancer Research UK, London WC2A 3PX, UK.
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Sha J, Wang SF, Suarez G, Sierra JC, Fadl AA, Erova TE, Foltz SM, Khajanchi BK, Silver A, Graf J, Schein CH, Chopra AK. Further characterization of a type III secretion system (T3SS) and of a new effector protein from a clinical isolate of Aeromonas hydrophila--part I. Microb Pathog 2007; 43:127-46. [PMID: 17644303 DOI: 10.1016/j.micpath.2007.05.002] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A type III secretion system (T3SS)-associated cytotoxin, AexT, with ADP-ribosyltransferase activity and homology to Pseudomonas aeruginosa bifuncational toxins ExoT/S, was recently identified from a fish pathogen Aeromonas salmonicida. In this study, we reported the molecular characterization of an aexT-like toxin gene (designated as aexU) from a diarrheal isolate SSU of A. hydrophila. The aexU gene was 1539bp in length and encoded a protein of 512 amino acid (aa) residues. The NH(2)-terminus of AexU (aa residues 1-231) exhibited a 67% homology with the NH(2)-terminus of AexT from A. salmonicida. Importantly, its COOH-terminus (aa residues 232-512) had no homology with any known functional proteins in the database; however, the full-length AexU retained ADP-ribosyltransferase activity. The expression and subsequent secretion of AexU was T3SS dependent, as inactivation of the ascV gene that codes for an inner-membrane component of the T3SS channel from the wild-type (WT) bacterium, blocked translocation of AexU in HT-29 human colonic epithelial cells. We provided evidence that inactivation of acrV and axsE genes (homologs of lcrV and exsE in Yersinia species and P. aeruginosa, respectively) from A. hydrophila SSU, altered expression and/or secretion of AexU. We deleted an aexU gene from the WT, as well as from the DeltaaopB mutant, of A. hydrophila, generating a single knockout (DeltaaexU) and a double knockout mutant, DeltaaopB/DeltaaexU. Increased phagocytosis was observed in RAW264.7 murine macrophages infected with the DeltaaopB/DeltaaexU mutant, as compared to macrophages when infected with the parental DeltaaopB strain. Further, mice infected with the DeltaaexU mutant had a 60% survival rate, compared to animals infected with the WT or the DeltaaexU-complemented strain that caused 90-100% of the animals to die at a 2-3 LD(50s) dose. Immunization of mice with the recombinant AexU protected them from subsequent lethal challenge dose by the WT bacterium. Finally, we detected specific anti-AexU antibodies in the sera of mice that survived challenge by the WT bacterium, which may indicate that AexU plays an important role in the pathogenesis of Aeromonas infections.
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Affiliation(s)
- Jian Sha
- Department of Microbiology , The University of Texas Medical Branch, 301 University Blvd., UTMB Galveston, TX 77555-1070, USA
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23
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Suraweera N, Haines J, McCart A, Rogers P, Latchford A, Coster M, Polanco-Echeverry G, Guenther T, Wang J, Sieber O, Tomlinson I, Silver A. Genetic determinants modulate susceptibility to pregnancy-associated tumourigenesis in a recombinant line of Min mice. Hum Mol Genet 2006; 15:3429-35. [PMID: 17062636 DOI: 10.1093/hmg/ddl419] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [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: 11/14/2022] Open
Abstract
Min mice provide a good model of human familial adenomatous polyposis. Recently, we have reported on two recombinant inbred lines (I and V) and the location of a modifier (Mom3) close to Apc, which altered polyp numbers in our mice possibly by modifying the frequency of wild-type (WT) allele loss at Apc; mice with severe disease (line V) showed elevated rates of loss. We now show that in line I only, a single pregnancy caused a significant increase in adenoma multiplicity compared with virgin controls (P<0.001) and that an additional pregnancy conferred a similar risk. Pregnancy was linked to both adenoma initiation and enhanced tumour growth in line I mice, and interline crosses indicated that susceptibility to pregnancy-associated adenomas was under genetic control. We found no evidence for the involvement of oestrodial metabolizing genes or the oestrogen receptors (Esr1 and 2) in tumour multiplicity. Importantly, a significantly elevated frequency of WT allele loss at Apc was observed in adenomas from parous mice (line and backcrossed) carrying the line I Min allele relative to equivalent virgin controls (P=0.015). Our results provide the first experimental evidence for genetic determinants controlling pregnancy-associated tumourigenesis; analogous genetic factors may exist in humans.
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Affiliation(s)
- N Suraweera
- ICMS, Barts and The London Queen Mary's School of Medicine and Dentistry, and Cancer Research UK Colorectal Cancer Unit and Academic Department of Pathology, St Mark's Hospital, Harrow, Middx, UK
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Sieber OM, Segditsas S, Knudsen AL, Zhang J, Luz J, Rowan AJ, Spain SL, Thirlwell C, Howarth KM, Jaeger EEM, Robinson J, Volikos E, Silver A, Kelly G, Aretz S, Frayling I, Hutter P, Dunlop M, Guenther T, Neale K, Phillips R, Heinimann K, Tomlinson IPM. Disease severity and genetic pathways in attenuated familial adenomatous polyposis vary greatly but depend on the site of the germline mutation. Gut 2006; 55:1440-8. [PMID: 16461775 PMCID: PMC1856441 DOI: 10.1136/gut.2005.087106] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Attenuated familial adenomatous polyposis (AFAP) is associated with germline mutations in the 5', 3', and exon 9 of the adenomatous polyposis coli (APC) gene. These mutations probably encode a limited amount of functional APC protein. METHODS AND RESULTS We found that colonic polyp number varied greatly among AFAP patients but members of the same family tended to have more similar disease severity. 5' Mutants generally had more polyps than other patients. We analysed somatic APC mutations/loss of heterozygosity (LOH) in 235 tumours from 35 patients (16 families) with a variety of AFAP associated germline mutations. In common with two previous studies of individual kindreds, we found biallelic changes ("third hits") in some polyps. We found that the "third hit" probably initiated tumorigenesis. Somatic mutation spectra were similar in 5' and 3' mutant patients, often resembling classical FAP. In exon 9 mutants, in contrast, "third hits" were more common. Most "third hits" left three 20 amino acid repeats (20AARs) on the germline mutant APC allele, with LOH (or proximal somatic mutation) of the wild-type allele; but some polyps had loss of the germline mutant with mutation leaving one 20AAR on the wild-type allele. CONCLUSIONS We propose that mutations, such as nt4661insA, that leave three 20AARs are preferentially selected in cis with some AFAP mutations because the residual protein function is near optimal for tumorigenesis. Not all AFAP polyps appear to need "three hits" however. AFAP is phenotypically and genetically heterogeneous. In addition to effects of different germline mutations, modifier genes may be acting on the AFAP phenotype, perhaps influencing the quantity of functional protein produced by the germline mutant allele.
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Affiliation(s)
- O M Sieber
- Molecular and Population Genetics Laboratory, Cancer Research UK, London Research Institute, London, UK
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Silver A, Helmy M, Yedavalli RV, Cohen AJ. 266 INFLAMMATORY PSEUDOTUMOR OF THE LIVER. J Investig Med 2005. [DOI: 10.2310/6650.2005.00005.265] [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: 11/18/2022]
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Abstract
OBJECTIVE To examine beliefs in relation to avoidance of activity in chronic fatigue syndrome (CFS) patients. METHODS The first phase consisted of modifying an existing chronic pain measure of kinesiophobia-fear of physical movement and activity-and validating it on the CFS population [Tampa Scale of Kinesiophobia-Fatigue (TSK-F); n=129; test-retest: r=.89, P<.001; alpha=.68]. Subscales of Illness Beliefs (alpha=.78) and Beliefs about Activity (alpha=.70) were identified. The second phase consisted of evaluating whether behavioural persistence was predicted by the TSK-F (n=33). Participants were asked to ride an exercise bike for as long as they felt able. RESULTS Analyses indicated that behavioural persistence did not correlate with maximal heart rate or resting heart rate, level of tiredness, symptom severity, illness identity or emotional distress. However, the TSK-F did correlate highly with distance travelled and added a significant 15% of the variance in distance after adjustments for gender and physical functioning (PF). The TSK-F Beliefs about Activity subscale appears to be the predictive factor, explaining 12% of the variance in excise performance or rather 12% of the avoidance of exercise. CONCLUSION Beliefs about Activity appear to be an important variable in predicting behaviour and avoidance of exercise. As avoidance has been suggested as a key to the maintenance of symptoms, disability and distress in CFS patients, this research has important theoretical, clinical and research implications.
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Affiliation(s)
- A Silver
- Department of Psychological Medicine, John Radcliffe Hospital, Headington, Oxford, UK.
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Schecter A, Piskac AL, Grosheva EI, Matorova NI, Ryan JJ, Fürst P, Adibi J, Pavuk M, Silver A, Ghaffar S. Levels of dioxins and dibenzofurans in breast milk of women residing in two cities in the Irkutsk Region of Russian Siberia compared with American levels. Chemosphere 2002; 47:157-164. [PMID: 11993631 DOI: 10.1016/s0045-6535(01)00196-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The presence of dioxins, dibenzofurans, and polychlorinated biphenyls (PCBs) in human tissue, food, and environmental samples from Russia has been monitored since 1988 as part of a research collaboration between a number of countries including Finland, the United States, Germany, the former Soviet Union, and Canada. Although elevated TCDD and PnCDD levels have previously been found in blood of male and female Russian chemical manufacturing workers and in their children, dioxin levels in the general population have usually been found to be lower than in Americans and Europeans. This study continues earlier work in the Irkutsk region of Russian Siberia, where we report levels of dioxin, dibenzofurans, and PCBs in human milk samples taken from general population women living in the industrialized cities of Angarsk and Usolye-Sibirskoye, near Lake Baikal. Total polychlorinated dibenzo-p-dioxin (PCDD) toxic equivalents (TEQs) compared in this paper for the industrialized regions of Siberia, Ukraine, and the US are similar, ranging from 6.1 to 7 parts per trillion (ppt). Recent 1998 milk samples from Angarsk and Usolye-Sibirskoye have total mean polychlorinated dibenzofuran (PCDF) TEQs of 10 and 21.7 ppt, respectively, with the other industrialized countries ranging from 2.3 to 6.7 ppt. Although dioxin-like PCBs were not measured for the city of Usolye-Sibirskoye (1998), total mean PCDD/F TEQ from Angarsk and Usolye-Sibirskoye (1998) were the two highest levels in this study, with 26.9 and 28.5 ppt, respectively, followed by 1993-1994 Ukraine samples with 24 ppt, 1989 Siberian samples with 13.6 ppt, and 1996 USA with 11.4 ppt total TEQ. In this study, higher levels of dioxins are noted in milk from Angarsk and Usolye-Sibirskoye than found in earlier Russian studies, with mean levels also exceeding 1996 and 1999 US breast milk dioxin levels.
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Affiliation(s)
- A Schecter
- University of Texas School of Public Health, Dallas 75390, USA.
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Meijne E, Huiskamp R, Haines J, Moody J, Finnon R, Wilding J, Spanjer S, Bouffler S, Edwards A, Cox R, Silver A. Analysis of loss of heterozygosity in lymphoma and leukaemia arising in F1 hybrid mice locates a common region of chromosome 4 loss. Genes Chromosomes Cancer 2001; 31:373-81. [PMID: 11433528 DOI: 10.1002/gcc.1156] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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: 11/07/2022] Open
Abstract
Previous studies have identified five lymphoma-related tumour suppressor gene regions on murine chromosome 4. Using detailed allelotype analysis on a range of lympho-haematopoietic tumour types arising in F1 hybrid mice, we now show a consistent pattern of loss of heterozygosity (LOH) which identifies a common region of loss delineated by microsatellites D4Mit21 and D4Mit53 on proximal chromosome 4. This critical segment corresponds to the thymic lymphoma tumour suppressor region 5 (TLSR5) identified in an earlier study. Tumours of this type have also been reported as showing allelic loss from the Trp53 and Ikaros regions on chromosome 11. In the present study, only a small fraction of tumours showed LOH in the Ikaros region, while a minority of lymphomas, but not acute myeloid leukaemias, showed allelic loss of the chromosome 11 segment encoding Trp53. These and other data indicate strongly that the genomic regions identified as showing recurrent LOH depend on the genetic background of the mice. Overall, the results indicate a key role for a tumour suppressor gene(s) encoded in an approximately 3 cM segment on proximal chromosome 4 and provide an experimental basis for the further investigation of the functional role of candidate genes which include Pax5 and Tgfbr1.
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Affiliation(s)
- E Meijne
- Nuclear Research and Consultancy Group (NRG), Petten, The Netherlands
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29
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Schecter A, Cramer P, Boggess K, Stanley J, Päpke O, Olson J, Silver A, Schmitz M. Intake of dioxins and related compounds from food in the U.S. population. J Toxicol Environ Health A 2001; 63:1-18. [PMID: 11346131 DOI: 10.1080/152873901750128326] [Citation(s) in RCA: 112] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The first U.S. nationwide food sampling with measurement of dioxins, dibenzofurans, and coplanar, mono-ortho and di-ortho polychlorinated biphenyls (PCBs) is reported in this study. Twelve separate analyses were conducted on 110 food samples divided into pooled lots by category. The samples were purchased in 1995 in supermarkets in Atlanta, GA, Binghamton, NY, Chicago, IL, Louisville, KY, and San Diego, CA. Human milk also was collected to estimate nursing infants' consumption. The food category with highest World Health Organization (WHO) dioxin toxic equivalent (TEQ) concentration was farm-grown freshwater fish fillet with 1.7 pg/g, or parts per trillion (ppt), wet, or whole, weight. The category with the lowest TEQ level was a simulated vegandiet, with 0.09 ppt. TEQ concentrations in ocean fish, beef, chicken, pork, sandwich meat, eggs, cheese, and ice cream, as well as human milk, were in the range O.33 to 0.51 ppt, wet weight. In whole dairy milk TEQ was 0.16 ppt, and in butter 1.1 ppt. Mean daily intake of TEQ for U.S. breast-fed infants during the first year of life was estimated at 42 pg/kg body weight. For children aged 1-11 yr the estimated daily TEQ intake was 6.2 pg/kg body weight. For males and females aged 12-19 yr, the estimated TEQ intake was 3.5 and 2.7 pg/kg body weight, respectively. For adult men and women aged 20-79 yr, estimated mean daily TEQ intakes were 2.4 and 2.2 pg/kg body weight, respectively. Estimated mean daily intake of TEQ declined with age to a low of 1.9 pg/kg body weight at age 80 yr and older. For all ages except 80 yr and over, estimates were higher for males than females. For adults, dioxins, dibenzofurans, and PCBs contributed 42%, 30%, and 28% of dietary TEQ intake, respectively. DDE was also analyzed in the pooled food samples.
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Affiliation(s)
- A Schecter
- University of Texas-Houston School of Public Health, Satellite Program at UT Southwestern Medical Center-Dallas 75390, USA.
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30
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Rosatte R, Donovan D, Allan M, Howes LA, Silver A, Bennett K, MacInnes C, Davies C, Wandeler A, Radford B. Emergency response to raccoon rabies introduction into Ontario. J Wildl Dis 2001; 37:265-79. [PMID: 11310877 DOI: 10.7589/0090-3558-37.2.265] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.1] [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: 11/20/2022]
Abstract
During 15 July to 4 October, 1999, rabies control programs were implemented with the objective being to contain the first three confirmed cases of raccoon rabies in Canada. The strategy, called point infection control (PIC) involved the use of three tactics: population reduction (PR), trap-vaccinate-release (TVR) and oral rabies vaccination with baits (ORV), to control the spread of raccoon rabies. A total of 1,202 raccoons (Procyon lotor) and 337 skunks (Mephitis mephitis) were captured and euthanized using 24,719 trap-nights in the three PR zones around the location of the three rabies cases, near Brockville, Ontario. That represented an 83% to 91% reduction in the raccoon populations in an approximate 225 km2 area around the three rabies cases. Raccoon density in the PR zones declined from 5.1-7.1/km2 to 0.6-1.1/km2 following control. All tested specimens were negative for rabies by the fluorescent antibody test (FAT). In addition, 1,759 raccoons and 377 skunks were intramuscularly vaccinated against rabies and released using 27,956 trap-nights in an approximate 485 km2 TVR zone implemented outside of the PR zones. A total of 856 cats from both PR and TVR areas were also captured, vaccinated and released. Cost for the three PIC operations was $363,000.00 Cdn or about $500.00 Cdn/km2. To further contain the outbreak, about 81,300 baits containing Raboral V-RG oral rabies vaccine were aerially distributed on 8 and 27 September 1999, to create an 8 to 15 km wide buffer zone (1,200 km2 area) of vaccinated raccoons immediately beyond the PR and TVR zones. This was the first time that V-RG was used in Canada to orally vaccinate free ranging raccoons against rabies. Baiting costs were $241,000.00 Cdn or about $200.00 Cdn/km2 including post baiting assessment costs. As of 31 August, 2000, thirty-five additional cases (38 in total) of raccoon rabies have occurred in the control and vaccination zones. This number is far below the level of rabies prevalence in USA jurisdictions where raccoon rabies was epizootic. In the future, PIC methodologies will continue to be used in Ontario to contain isolated cases of raccoon rabies.
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Affiliation(s)
- R Rosatte
- Ontario Ministry of Natural Resources, Rabies Research Unit, Trent University, Peterborough, Canada.
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31
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Yu Y, Okayasu R, Weil MM, Silver A, McCarthy M, Zabriskie R, Long S, Cox R, Ullrich RL. Elevated breast cancer risk in irradiated BALB/c mice associates with unique functional polymorphism of the Prkdc (DNA-dependent protein kinase catalytic subunit) gene. Cancer Res 2001; 61:1820-4. [PMID: 11280730] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Female BALB/c mice are unusually radiosensitive and more susceptible than C57BL/6 and other tested inbred mice to ionizing radiation (IR)-induced mammary tumors. This breast cancer susceptibility is correlated with elevated susceptibility for mammary cell transformation and genomic instability following irradiation. In this study, we report the identification of two BALB/c strain-specific polymorphisms in the coding region of Prkdc, the gene encoding the DNA-dependent protein kinase catalytic subunit, which is known to be involved in DNA double-stranded break repair and post-IR signal transduction. First, we identified an A --> G transition at base 11530 resulting in a Met --> Val conversion at codon 3844 (M3844V) in the phosphatidylinositol 3-kinase domain upstream of the scid mutation (Y4046X). Second, we identified a C --> T transition at base 6418 resulting in an Arg --> Cys conversion at codon 2140 (R2140C) downstream of the putative leucine zipper domain. This unique PrkdcBALB variant gene is shown to be associated with decreased DNA-dependent protein kinase catalytic subunit activity and with increased susceptibility to IR-induced genomic instability in primary mammary epithelial cells. The data provide the first evidence that naturally arising allelic variation in a mouse DNA damage response gene may associate with IR response and breast cancer risk.
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MESH Headings
- Amino Acid Sequence
- Animals
- Catalytic Domain/genetics
- Cricetinae
- Crosses, Genetic
- DNA-Activated Protein Kinase
- DNA-Binding Proteins
- Female
- Genetic Predisposition to Disease/genetics
- Humans
- Male
- Mammary Glands, Animal/enzymology
- Mammary Glands, Animal/physiology
- Mammary Glands, Animal/radiation effects
- Mammary Neoplasms, Experimental/enzymology
- Mammary Neoplasms, Experimental/etiology
- Mammary Neoplasms, Experimental/genetics
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Molecular Sequence Data
- Neoplasms, Radiation-Induced/enzymology
- Neoplasms, Radiation-Induced/genetics
- Nuclear Proteins
- Polymorphism, Genetic/physiology
- Protein Serine-Threonine Kinases/genetics
- Radiation Tolerance/genetics
- Sequence Homology, Amino Acid
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Affiliation(s)
- Y Yu
- Department of Radiation Oncology, The University of Texas Medical Branch, Galveston 77555, USA
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32
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Okayasu R, Suetomi K, Yu Y, Silver A, Bedford JS, Cox R, Ullrich RL. A deficiency in DNA repair and DNA-PKcs expression in the radiosensitive BALB/c mouse. Cancer Res 2000; 60:4342-5. [PMID: 10969773] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
We have studied the efficiency of DNA double strand break (DSB) rejoining in primary cells from mouse strains that show large differences in in vivo radiosensitivity and tumor susceptibility. Cells from radiosensitive, cancer-prone BALB/c mice showed inefficient end joining of gamma ray-induced DSBs as compared with cells from all of the other commonly used strains and F1 hybrids of C57BL/6 and BALB/c mice. The BALB/c repair phenotype was accompanied by a significantly reduced expression level of DNA-PKcs protein as well as a lowered DNA-PK activity level as compared with the other strains. In conjunction with published reports, these data suggest that natural genetic variation in nonhomologous end joining processes may have a significant impact on the in vivo radiation response of mice.
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Affiliation(s)
- R Okayasu
- Department of Radiological Health Sciences, Colorado State University, Fort Collins 80523-1673, USA.
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33
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Haines J, Dunford R, Moody J, Ellender M, Cox R, Silver A. Loss of heterozygosity in spontaneous and X-ray-induced intestinal tumors arising in F1 hybrid min mice: evidence for sequential loss of APC(+) and Dpc4 in tumor development. Genes Chromosomes Cancer 2000; 28:387-94. [PMID: 10862047 DOI: 10.1002/1098-2264(200008)28:4<387::aid-gcc4>3.0.co;2-h] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [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: 01/25/2023] Open
Abstract
Min (multiple intestinal neoplasia) mice carry a mutant allele of the murine Apc (adenomatous polyposis coli) locus and are predisposed to intestinal adenoma formation in the intestinal tract. Early studies have shown complete loss of function of Apc by whole chromosome loss on the tumor-sensitive C57BL/6J genetic background and in AKR x B6 F1 hybrids. Gamma-radiation-induced chromosomal losses focus the critical region on wt Apc, but because of the limited number of polymorphic markers used, no other critical regions of loss on chromosome 18 were identified. Using intestinal tumors arising spontaneously and induced by X-rays in CBA/H x C57BL/6J F1 hybrid mice and high-resolution microsatellite loss of heterozygosity (LOH) techniques, we provide mapping data for wt Apc loss, which confirms and extends earlier observations. In addition, high-frequency loss events at the Dpc4 locus were found in both spontaneous and radiation-induced tumors. These data identified LOH of Dpc4 as a critical secondary event following complete functional loss of Apc. LOH across the Trp53 genomic region of chromosome 11 was not observed. No LOH was recorded for the Mom1 candidate gene Pla2g2a or for 9 out of 10 polymorphic markers from the Mom1 genomic region on murine chromosome 4. One marker mapping distal to Pla2g2a showed LOH in a small minority of spontaneous tumors. These data support the contention that Mom1 does not act as a classical tumor suppressor. Overall, our data indicates a significant role for Dpc4 mutation in intestinal tumor progression in the mouse and provides further evidence for the importance of interstitial chromosome losses in radiation tumorigenesis.
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MESH Headings
- Animals
- Crosses, Genetic
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/radiation effects
- Gamma Rays
- Genes, APC/genetics
- Genes, APC/radiation effects
- Genes, p53/genetics
- Genes, p53/radiation effects
- Intestinal Neoplasms/genetics
- Life Expectancy
- Loss of Heterozygosity/genetics
- Loss of Heterozygosity/radiation effects
- Mice
- Mice, Inbred AKR
- Mice, Inbred C57BL
- Mice, Inbred CBA
- Mice, Mutant Strains
- Microsatellite Repeats
- Neoplasms, Radiation-Induced/genetics
- Signal Transduction/genetics
- Signal Transduction/radiation effects
- Smad4 Protein
- Trans-Activators/genetics
- Trans-Activators/radiation effects
- X-Rays
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Affiliation(s)
- J Haines
- Radiation Effects Department, National Radiological Protection Board, Chilton, Oxfordshire, England
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34
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Pazzaglia S, Pariset L, Rebessi S, Saran A, Coppola M, Covelli V, Moody J, Bouffler S, Cox R, Silver A. Somatic cell hybrids for high-density mapping of chromosome 2 breakpoints in radiation-induced myeloid leukemia cell lines from inbred mice. Mol Carcinog 2000; 27:219-28. [PMID: 10708484] [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] [Indexed: 02/15/2023]
Abstract
Chromosome 2 (chr 2) deletions are recurrent abnormalities in acute myeloid leukemia (AML) induced by ionizing radiation in the mouse. The localization of deletion sites has proven extremely useful in providing information on the molecular mechanisms of leukemogenesis. The models available for the study of AML are mostly represented by inbred mouse strains, in which the molecular resolution of breakpoints is problematic. In this study, we have examined five leukemic cell lines exhibiting hemizygous chr 2 loss, derived from CBA, C3H, or (C57BLxCBA/H) F1 mice in which AML had been induced by a whole-body dose of radiation. By application of a somatic cell hybridization technique, we have generated interspecific cell hybrids retaining the deleted murine chr 2 homologue. This strategy permitted a very detailed genetic analysis allowing the utilization of any genetic marker on chr 2 without a requirement for polymorphism. Somatic cell hybrid clones were subjected to a high-density polymerase chain reaction-based microsatellite screening using 62-106 informative markers for each cell line. Detailed maps accurately defining chr 2 breakpoints were obtained. The identification of critical breakpoint markers allowed the construction of partial yeast artificial chromosome contigs across chr 2 breakpoints. These maps represent an essential resource for cloning of the breakpoint regions.
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Affiliation(s)
- S Pazzaglia
- Division of Protection of Man and the Ecosystems, ENEA CR-Casaccia, Rome, Italy
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Farias-Eisner R, Vician L, Silver A, Reddy S, Rabbani SA, Herschman HR. The urokinase plasminogen activator receptor (UPAR) is preferentially induced by nerve growth factor in PC12 pheochromocytoma cells and is required for NGF-driven differentiation. J Neurosci 2000; 20:230-9. [PMID: 10627600 PMCID: PMC6774117] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
Nerve growth factor (NGF)-driven differentiation of PC12 pheochromocytoma cells is a well studied model used both to identify molecular, biochemical, and physiological correlates of neurotrophin-driven neuronal differentiation and to determine the causal nature of specific events in this differentiation process. Although epidermal growth factor (EGF) elicits many of the same early biochemical and molecular changes in PC12 cells observed in response to NGF, EGF does not induce molecular or morphological differentiation of PC12 cells. The identification of genes whose expression is differentially regulated by NGF versus EGF in PC12 cells has, therefore, been considered a source of potential insight into the molecular specificity of neurotrophin-driven neuronal differentiation. A "second generation" representational difference analysis procedure now identifies the urokinase plasminogen activator receptor (UPAR) as a gene that is much more extensively induced by NGF than by EGF in PC12 cells. Both an antisense oligonucleotide for the UPAR mRNA and an antibody directed against UPAR protein block NGF-induced morphological and biochemical differentiation of PC12 cells; NGF-induced UPAR expression is required for subsequent NGF-driven differentiation.
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Affiliation(s)
- R Farias-Eisner
- Department of Obstetrics and Gynecology, University of California, Los Angeles, Center for the Health Sciences, Los Angeles, California, USA
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Abstract
U.S. tuberculosis incidence rates increased steadily from 1985 through the end of 1992. Many factors have been implicated as contributors to the reversal in the historic decline of tuberculosis: the HIV epidemic, poverty and homelessness, immigration from less developed countries, and a deteriorating public health infrastructure. The purposes of this study were to demonstrate the extent of geographic variation in tuberculosis incidence rate trends in North and South Carolina and to quantify the association between aggregate-level characteristics of state economic areas and incidence rate trends. Data were obtained from the U.S. 1980 and 1990 decennial census and from the North and South Carolina health departments. In North Carolina, tuberculosis trends declined rapidly in the early 1980s, but declined much less rapidly from 1986 to 1992. In South Carolina, tuberculosis trends were nearly static during the early 1980s, but declined rapidly from 1986 to 1992. Rural and high-poverty state economic areas in South Carolina experienced especially favorable changes in tuberculosis incidence trends. South Carolina has a unique tuberculosis control program that makes widespread use of enablers, incentives, and directly observed therapy. This study demonstrates the distinct tuberculosis incidence trends that existed in two contiguous states and suggests that approaches to tuberculosis control that improve access to care may be effective in improving tuberculosis incidence trends, particularly in poor and rural areas. Strengthening tuberculosis programs may be an important strategy for controlling the current resurgence of tuberculosis in the United States.
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Affiliation(s)
- P S Millard
- Cecil G. Sheps Center for Health Services Research, University of NorthCarolina-Chapel Hill
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37
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Abstract
Severe combined immunodeficiency (scid) mice are deficient in the enzyme DNA-PK (DNA-dependent protein kinase) as a result of the mutation in the gene encoding the catalytic subunit (DNA-PKcs) of this enzyme. DNA-PKcs is a member of the phosphatidylinositol 3-kinase superfamily, which includes the human protein ATM (ataxia telangiectasia mutated) and the yeast protein Tel1. Using Q-FISH (quantitative fluorescence in situ hybridization), we show here that scid mice from four different genetic backgrounds have, on average, 1.5-2 times longer telomeres than those of corresponding wild-type mice. Our results point to the possibility that DNA-PKcs may, directly or indirectly, be involved in telomere length regulation in mammalian cells.
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Affiliation(s)
- P Hande
- The Terry Fox Laboratory, British Columbia Cancer Research Center, 601 West 10th Avenue, Vancouver, British Columbia, V5Z 1L3, Canada
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Silver A, Moody J, Dunford R, Clark D, Ganz S, Bulman R, Bouffler S, Finnon P, Meijne E, Huiskamp R, Cox R. Molecular mapping of chromosome 2 deletions in murine radiation-induced AML localizes a putative tumor suppressor gene to a 1.0 cM region homologous to human chromosome segment 11p11-12. Genes Chromosomes Cancer 1999; 24:95-104. [PMID: 9885975] [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] [Indexed: 02/09/2023] Open
Abstract
Radiation-induced acute myeloid leukemias (AMLs) in the mouse are characterized by chromosome 2 deletions. Previous studies showed that a minimal deleted region (mdr) of approximately 6.5 cM is lost from one homologue in chromosome 2-deleted AMLs. An AML tumor suppressor gene is proposed to map within this mdr. In this study, we refine the mdr to a I cM interval between markers D2Mit126 and D2Mit185 by microsatellite analysis of 21 primary radiation-induced F I AMLs. The construction of a partial yeast artificial chromosome (YAC) contig spanning the mdr and the location of six known genes indicated that the 1 cM mdr is homologous to human 11p11-12, a region implicated in some human AMLs. Screening of five cell lines derived from primary radiation-induced AMLs for homozygous loss of microsatellites and genes mapping within the mdr revealed loss of both copies of the hemopoietic tissue-specific transcription factor Sfpi1(PU.1/Spi1) in one cell line. Studies of primary and F1 AMLs failed to implicate Sfpi1 as the AML tumor suppressor gene. YAC contig construction, together with data suggesting that the critical gene flanks Sfpi1, represents significant progress toward identifying an AML tumor suppressor gene.
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MESH Headings
- Animals
- Chromosome Deletion
- Chromosome Mapping/methods
- Chromosomes, Artificial, Yeast
- Chromosomes, Human, Pair 11/genetics
- Contig Mapping
- Crosses, Genetic
- Genes, Tumor Suppressor/genetics
- Humans
- Leukemia, Myeloid, Acute
- Mice
- Mice, Inbred C57BL
- Mice, Inbred CBA
- Microsatellite Repeats/genetics
- Sequence Homology, Nucleic Acid
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Affiliation(s)
- A Silver
- Radiation Effects Department, National Radiological Protection Board, Chilton, Oxfordshire, England.
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39
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Abstract
Telomeres are specialized structures consisting of repeat arrays of TTAGGGn located at the ends of chromosomes. They are essential for chromosome stability and, in the majority of normal somatic cells, telomeres shorten with each cell division. Most immortalized cell lines and tumours reactivate telomerase to stabilize the shortening chromosomes. Telomerase activation is regarded as a central step in carcinogenesis and, here, we demonstrate telomerase activation in premalignant skin lesions and also in all forms of skin cancer. Telomerase activation in normal skin was a rare event, and among 16 samples of normal skin (one with a history of chronic sun exposure) 12.5% (2 out of 16) exhibited telomerase activity. One out of 16 (6.25%) benign proliferative lesions, including viral and seborrhoeic wart samples, had telomerase activity. In premalignant actinic keratoses and Bowen's disease, 42% (11 out of 26) of samples exhibited telomerase activity. In the basal cell carcinoma and cutaneous malignant melanoma (CMM) lesions, telomerase was activated in 77% (10 out of 13) and 69% (22 out of 32) respectively. However, only 25% (3 out of 12) of squamous cell carcinomas (SCC) had telomerase activity. With the exception of one SCC sample, telomerase activity in a positive control cell line derived from a fibrosarcoma (HT1080) was not inhibited when mixed with the telomerase-negative SCC or CMM extracts, indicating that, overall, Taq polymerase and telomerase inhibitors were not responsible for the negative results. Mean telomere hybridizing restriction fragment (TRF) analysis was performed in a number of telomerase-positive and -negative samples and, although a broad range of TRF sizes ranging from 3.6 to 17 kb was observed, a relationship between telomerase status and TRF size was not found.
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Affiliation(s)
- C N Parris
- Department of Biology and Biochemistry, Brunel University, Uxbridge, Middlesex, UK
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Rasio D, Murakumo Y, Robbins D, Roth T, Silver A, Negrini M, Schmidt C, Burczak J, Fishel R, Croce CM. Characterization of the human homologue of RAD54: a gene located on chromosome 1p32 at a region of high loss of heterozygosity in breast tumors. Cancer Res 1997; 57:2378-83. [PMID: 9192813] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A search of the Human Genome Sciences database of expressed sequence-tagged DNA fragments, for sequences containing homology to known yeast DNA recombination and repair genes, yielded a cDNA fragment with high homology to RAD54. Here we describe the complete cDNA sequence and the characterization of the genomic locus coding for the human homologue of the yeast RAD54 gene (hRAD54). The yeast RAD54 belongs to the RAD52 epistasis group and appears to be involved in both DNA recombination and repair. The hRAD54 gene maps to chromosome 1p32 in a region of frequent loss of heterozygosity in breast tumors and encodes a protein of M(r) 93,000 that displays 52% identity to the yeast RAD54 protein. The hRAD54 protein sequence additionally contains all seven of the consensus segments of a superfamily of proteins with presumed or proven DNA helicase activity. Mutations in genes with consensus helicase homology have been found in cancer-prone syndromes such as xeroderma pigmentosum and Bloom syndrome as well as Werner's syndrome, in which patients age prematurely, and the X-linked mental retardation with alpha-thalassemia syndrome, ATR-X. We have examined the hRAD54 gene in several breast tumors and breast tumor cell lines and, although the gene region appears to be deleted in several tumors, at present we have found no coding sequence mutations.
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Affiliation(s)
- D Rasio
- Kimmel Cancer Institute and Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA
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Wurzelmann JI, Silver A, Schreinemachers DM, Sandler RS, Everson RB. Iron intake and the risk of colorectal cancer. Cancer Epidemiol Biomarkers Prev 1996; 5:503-7. [PMID: 8827353] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Prospectively gathered data from the National Health and Nutrition Examination Survey I and the National Health Evaluation Follow-Up Study were analyzed to evaluate the risk of colorectal cancer due to consumption of iron. Morbidity and mortality data due to colorectal cancer were available on 14,407 persons first interviewed in 1971 and followed through 1986. A total of 194 possible colorectal cancers occurred in this group over the 15-year period. Subsite analysis showed that the risk of colon cancer due to iron intake was elevated throughout the colon for both men and women, with the highest adjusted risks for the interquartile range seen in the proximal colon for females (relative risk, 1.51; 95% confidence interval, 1.41-1.60). The risk of rectal cancer was not significantly elevated for men or women. Elevated serum iron was also associated with increased risk; however, this effect was strongest in the distal (rather than proximal) colon and was significant only among females (adjusted relative risk, 1.73; 95% confidence interval, 1.03-2.92). The mean transferrin saturation was higher among cases than controls (30.7 versus 28.7%), but total iron-binding capacity did not seem to predict the occurrence of colorectal cancer. Proportional hazards models confirmed that the effects of iron and serum iron were not confounded by age, gender, energy consumption, fat intake, or other known risk factors for colorectal cancer. These data suggest that iron may confer an increased risk for colorectal cancer, and that the localization of risk may be attributable to the mode of epithelial exposure. It seems that luminal exposure to iron increases risk proximally, whereas humoral exposure increases risk distally. These differences may be due to such factors as oxidation state, binding proteins and the presence of other cofactors such as bile acids, products of bacterial metabolism.
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Affiliation(s)
- J I Wurzelmann
- Division of Digestive Diseases, University of North Carolina, Chapel Hill 27599-7038, USA
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Silver A, Eichorn A, Kral J, Pickett G, Barie P, Pryor V, Dearie MB. Timeliness and use of antibiotic prophylaxis in selected inpatient surgical procedures. The Antibiotic Prophylaxis Study Group. Am J Surg 1996; 171:548-52. [PMID: 8678197 DOI: 10.1016/s0002-9610(96)00036-0] [Citation(s) in RCA: 83] [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] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Twenty-five percent of all nosocomial infections are wound infections. Professional guidelines support the timely use of preoperative prophylaxis for prevention of postoperative wound infections. Barriers exist in implementing this practice. IPRO, the New York State peer review organization, as part of the Health Care Financing Administration's Health Care Quality Improvement Program, sought to determine the proportion of patients receiving timely antibiotic prophylaxis for aortic grafts, hip replacements and colon resections in 44 hospitals in New York State. METHODS IPRO conducted a retrospective medical record review of 44 hospitals through out New York State stratified for teaching, nonteaching status. A sample was drawn of 2651 patients, 2256 from Medicare and 395 from Medicaid, undergoing either abdominal aortic aneurysm repair, partial or total hip replacement or large bowel resection. The study determined the proportion of patients who had documentation of receiving antibiotics and those who received antibiotics timely, that is less than or equal to 2 hours preoperatively. RESULTS Eighty-six percent of patients had documentation of receiving an antibiotic. Forty-six percent of aneurysm repairs and 60% of hip replacements had evidence of receiving timely antibiotic prophylaxis, that is within 2 hours prior to surgery. For colon resections, 73% of cases had either oral prophylaxis or timely parenteral therapy. An increased proportion of patients had received parenteral antibiotics prematurely as the surgical start time occurred later in the day. A total of 44 different antibiotics were recorded for prophylaxis. CONCLUSIONS Antibiotic prophylaxis was performed in 81% to 94% of cases, however, anywhere from 27% to 54% of all cases did not receive antibiotics in a timely fashion. By delegating implementation of ordered antibiotic prophylaxis to the anesthesia team, timing may be improved and the incidence of postoperative wound infections may decrease.
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Affiliation(s)
- A Silver
- Department of Medical Affairs, IPRO, Lake Success, New York 11042, USA
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Devico A, Silver A, Thronton AM, Sarngadharan MG, Pal R. Covalently crosslinked complexes of human immunodeficiency virus type 1 (HIV-1) gp120 and CD4 receptor elicit a neutralizing immune response that includes antibodies selective for primary virus isolates. Virology 1996; 218:258-63. [PMID: 8615032 DOI: 10.1006/viro.1996.0188] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [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: 01/31/2023]
Abstract
Specific conformational changes in the envelope glycoprotein gp120 of the human immunodeficiency virus type-1 (HIV-1) may be critical for eliciting a broadly neutralizing immune response against primary virus isolates. Since the interaction of gp120 with its receptor, CD4, induces conformational perturbations in both molecules, gp120-CD4 complexes should present unique immunogenic features that may include novel epitopes for broadly neutralizing antibodies. To test this hypothesis, we raised polyclonal antiserum against covalently crosslinked gp120-CD4 complexes in a goat and examined the ability of the anti-complex antibodies to neutralize primary and laboratory-adapted HIV-1 isolates. In cell-free neutralization assays with HIV-1MN, the antiserum demonstrated the ability to neutralize primary virus more effectively than the laboratory-adapted isolate. The neutralizing capacity of the anti-complex serum extended to primary isolates from distant genetic clades A, D, and E, although the degree of neutralization was found to vary among the clades. The neutralizing activity of the serum was composed of two components. The first component included anti-CD4 antibodies that recognized epitopes outside the gp120 binding site; the second was independent of CD4 reactivity and was retained after removal of cell surface anti-CD4 reactivity by repeated absorption with CD4-positive cells. These results demonstrate that gp120-CD4 complexes can elicit a unique polyclonal antibody response that is relevant to the neutralization of primary isolates of HIV-1.
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Affiliation(s)
- A Devico
- Advanced BioScience Laboratories, Inc., 5510 Nicholson Lane, Kensington, Maryland, 20895, USA
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Levine AJ, Wu MC, Chang A, Silver A, Attiyeh EF, Lin J, Epstein CB. The spectrum of mutations at the p53 locus. Evidence for tissue-specific mutagenesis, selection of mutant alleles, and a "gain of function" phenotype. Ann N Y Acad Sci 1995; 768:111-28. [PMID: 8526340 DOI: 10.1111/j.1749-6632.1995.tb12115.x] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- A J Levine
- Department of Molecular Biology, Lewis Thomas Laboratory, Princeton University, New Jersey 08544-1014, USA
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45
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Levine AJ, Chang A, Dittmer D, Notterman DA, Silver A, Thorn K, Welsh D, Wu M. The p53 tumor suppressor gene. J Lab Clin Med 1994; 123:817-23. [PMID: 8201258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- A J Levine
- Department of Molecular Biology, Princeton University, NJ 98544-1014
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Levine AJ, Perry ME, Chang A, Silver A, Dittmer D, Wu M, Welsh D. The 1993 Walter Hubert Lecture: the role of the p53 tumour-suppressor gene in tumorigenesis. Br J Cancer 1994; 69:409-16. [PMID: 8123467 PMCID: PMC1968876 DOI: 10.1038/bjc.1994.76] [Citation(s) in RCA: 330] [Impact Index Per Article: 11.0] [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] [Indexed: 01/28/2023] Open
Abstract
The p53 tumour-suppressor gene is mutated in 60% of human tumours, and the product of the gene acts as a suppressor of cell division. It is thought that the growth-suppressive effects of p53 are mediated through the transcriptional transactivation activity of the protein. Overexpression of the p53 protein results either in arrest in the G1 phase of the cell cycle or in the induction of apoptosis. Both the level of the protein and its transcriptional transactivation activity increase following treatment of cells with agents that damage DNA, and it is thought that p53 acts to protect cells against the accumulation of mutations and subsequent conversion to a cancerous state. The induction of p53 levels in cells exposed to gamma-irradiation results in cell cycle arrest in some cells (fibroblasts) and apoptosis in others (thymocytes). Cells lacking p53 have lost this cell cycle control and presumably accumulate damage-induced mutations that result in tumorigenesis. Thus, the role of p53 in suppressing tumorigenesis may be to rescue the cell or organism from the mutagenic effects of DNA damage. Loss of p53 function accelerates the process of tumorigenesis and alters the response of cells to agents that damage DNA, indicating that successful strategies for radiation therapy may well need to take into account the tissue of origin and the status of p53 in the tumour.
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Affiliation(s)
- A J Levine
- Department of Molecular Biology, Princeton University, New Jersey 08544-1014
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Abstract
OBJECTIVE To determine the acceptability and feasibility of screening for carriers of cystic fibrosis in a primary care setting. DESIGN Follow up study over 15 months of patients offered carrier testing by mouthwash. SETTING A general practice in inner London. SUBJECTS 5529 patients aged 18-45 invited by various methods and combinations of methods (letter, booklet, personal approach) for testing. MAIN OUTCOME MEASURES Uptake of screening, anxiety, and knowledge of test. RESULTS 957 (17%) invitees were screened over the 15 months. 28 carriers and no carrier couples were detected. Uptake rates were 12% (59/502 patients) among patients invited by letter and tested by appointment; 9% (47/496) among patients invited by letter, with leaflet, and tested by appointment; 4% (128/2953) among patients invited by letter six weeks before the end of the study and tested by appointment; 17% (81/471) among patients offered passive opportunistic testing; 70% (453/649) among patients offered active opportunistic testing; and 25% (22/88) among patients offered active opportunistic testing by appointment. A short term rise in anxiety among those given a positive test result had dissipated by three months. At three months about one fifth and one third of those given positive and negative results respectively did not understand their results correctly. CONCLUSION These results suggest that the strongest variable in determining uptake of screening is the active approach by a health professional offering immediate testing. It remains to be resolved whether the high uptake rates achieved by active recruitment indicate a supply push for this new test rather than a demand from the population.
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Affiliation(s)
- H Bekker
- Wellcome Psychology and Genetics Research Group, United Medical School of Guy's Hospital, London
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48
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Abstract
Tumour-associated genetic changes frequently involve DNA translocation or deletion. Many of these events will have arisen from initial genomic damage, induced by either the activity of endogenous metabolic processes or from exposure to environmental genotoxic agents. Although initial genomic damage will have been widely distributed, tumorigenic events are confined to certain DNA target sites. Furthermore, within these target sites there appear to be regions of preferential DNA rearrangement, and examination of these sites implies that the location and extent of such rearrangement may be influenced by DNA primary and secondary structure rather than simply by the point of damage. We selectively review evidence relating to DNA structures that may predispose certain regions of the genome to damage-induced rearrangement, and discuss the possible role of interstitial, inverted telomere-like sequence arrays in promoting chromosomal events of a type known to be associated with some human and animal tumours.
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Affiliation(s)
- S Bouffler
- Biomedical Effects Department, National Radiological Protection Board, Didcot, Oxon, UK
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Silver A, Cox R. Telomere-like DNA polymorphisms associated with genetic predisposition to acute myeloid leukemia in irradiated CBA mice. Proc Natl Acad Sci U S A 1993; 90:1407-10. [PMID: 8434000 PMCID: PMC45882 DOI: 10.1073/pnas.90.4.1407] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 01/30/2023] Open
Abstract
There is evidence that interstitial telomere (TTAGGG)n-like sequences at chromosome 2 fragile sites play an important role in the somatic events that characterize the earliest phases of radiation-induced acute myeloid leukemia in the CBA/H mouse. Here we show that the highly inbred CBA/H colony unexpectedly contains four genotypic variants for telomere-like sequence arrays and that almost all induced myeloid leukemias derive from one of the variant subpopulations that constitutes approximately 20% of the colony. Preliminary evidence on the irregular inheritance patterns for these variant sequences is discussed together with the proposal that one form of these telomere sequence arrays either represents or is closely linked to a locus that influences chromosome 2 breakage patterns in hemopoietic cells following irradiation and, through this, susceptibility to induced myeloid leukemia.
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Affiliation(s)
- A Silver
- Biomedical Effects Department, National Radiological Protection Board, Didcot, Oxon, United Kingdom
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50
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Bouffler S, Silver A, Papworth D, Coates J, Cox R. Murine radiation myeloid leukaemogenesis: relationship between interstitial telomere-like sequences and chromosome 2 fragile sites. Genes Chromosomes Cancer 1993; 6:98-106. [PMID: 7680894 DOI: 10.1002/gcc.2870060206] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
While the specific nature of chromosomal fragile sites and their relationship to human leukaemogenesis remain obscure, there is evidence that chromosomal fragility may, in some circumstances, be associated with telomere-like repeat sequences and that chromosome 2 fragility in the mouse is involved in the initiation of myeloid leukaemia by ionising radiation. Here we describe the molecular cloning and characterisation of two murine telomere-like sequences, one having an inverted repeat structure and the other a simple tandem repeat organisation. The inverted telomere repeat clone generates an in situ chromosome 2 hybridisation pattern very similar to the distribution of the radiation-sensitive fragile sites previously found to be associated with leukaemogenic initiation. Furthermore, statistical comparison of the distributions of radiation induced breakpoints and sites of inverted telomere repeat hybridization indicates concordance at all chromosome 2 sites excluding the terminal regions. These data are discussed with respect to mechanisms of radiation-induced, site-specific chromosome 2 rearrangement and their implications for leukaemogenic initiation.
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Affiliation(s)
- S Bouffler
- National Radiological Protection Board, Didcot, Oxon, United Kingdom
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