Full-textDOI: · Available from: Nejat Akar, Sep 25, 2015
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- Medical Oncology 02/2008; 25(1):54-5. DOI:10.1007/s12032-007-0046-4 · 2.63 Impact Factor
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ABSTRACT: Identifying molecular markers for tumor recurrence is critical in successfully selecting patients with stage III colon cancer who are more likely to benefit from adjuvant chemotherapy. The present study analyzed a subset of 10 polymorphisms within eight genes involved in the tumor angiogenesis pathway and their impact on prognosis in stage III colon cancer patients treated with adjuvant chemotherapy. Blood samples were obtained from 125 patients with locally advanced colon cancer at University of Southern California medical facilities. DNA was extracted from peripheral blood and the genotypes were analyzed using PCR-restriction fragment length polymorphism and 5'-end [gamma-(33)P] ATP-labeled PCR protocols. Polymorphisms in vascular endothelial growth factor (VEGF) (C+936T; P = 0.003, log-rank test) and interleukin-8 (IL-8) (T-251A; P = 0.04, log-rank test) were independently associated with risk of recurrence in stage III colon cancer patients. In combined analysis, grouping alleles into favorable versus nonfavorable alleles, high expression variants of VEGF C+936T and IL-8 T-251A were associated with a higher likelihood of developing tumor recurrence (P < 0.001). High expression variants of VEGF C+936T and IL-8 T-251A were associated with shorter time to tumor recurrence, indicating that the analysis of angiogenesis-related gene polymorphisms may help to identify patient subgroups at high risk for tumor recurrence.Annals of Oncology 06/2008; 19(10):1734-41. DOI:10.1093/annonc/mdn368 · 7.04 Impact Factor
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ABSTRACT: Tumor growth requires the formation of new blood vessels, a phenomenon known as angiogenesis. The most important regulator of angiogenesis is vascular endothelial growth factor (VEGF). Several common polymorphisms in the VEGF-gene have been associated with different VEGF expression, production and plasma levels according to allele status, and influence the risk of developing different types of cancer. Therefore, these variants might be risk factors for colorectal cancer (CRC). In the present case-control study, VEGF genotypes of the +936 C>T, -2578 C>A and -634 G>C polymorphisms were determined in 427 patients with histologically verified CRC and 427 age and sex-matched healthy control subjects. Genotypes were analyzed by a fluorogenic exonuclease assay (TaqMan). P-value for age at diagnosis was analyzed by student's t test, P-values for tumor characteristics were determined by Pearson's Chi-square test. Threshold for significance was P<0.05. At the time of diagnoses, patients were between 29 and 83 years of age, with a mean age of 61+/-10.9 years. VEGF -2578 C>A and VEGF -634 G>C genotype frequencies were similar among patients and controls. Carriers of the 936T-allele were found slightly more frequent among controls (27.2%) than among patients (22.5%), but this difference did not reach statistical significance (P=0.07). Furthermore, no correlation was found between all these variants and tumor characteristics like size, histological grading, positive regional lymph node metastases or tumor stage. We conclude that the investigated polymorphisms are not associated with individual susceptibility to colorectal cancer.Journal of Cancer Research and Clinical Oncology 06/2008; 134(5):591-5. DOI:10.1007/s00432-007-0322-x · 3.08 Impact Factor