Abstract
Although BRCA genes have been implicated in certain tumors, particularly breast tumors, their role in colon tumorigenesis has not been fully explored. We aimed to investigate the association of the BRCA2 and putative "BRCA3" genes in a homogeneous series of right-sided colon cancer specimens. Twenty-three Dukes' stage C, replication error-negative carcinomas were selected from patients with right-sided colon cancer. After histological examination and microdissection, DNA was extracted from normal colon and carcinoma from each patient. Five microsatellite markers spanning the region of BRCA2 and BRCA3 on chromosome 13 (D13S218, D13S219, D13S165, D13S156, and D13S160) and two markers intragenic to BRCA2 and BRCA3 (D13S171 and D13S1308, respectively) were used. Polymerase chain reaction products were analyzed by using a fluorescent allele imbalance assay. Markers demonstrating the highest allelic imbalance were D13S1308 (53%), D13S171 (33%), and D13S160 (37%). The intragenic markers D13S1308 (BRCA3) and D13S171 (BRCA2) on chromosome 13 demonstrated a high frequency of allelic imbalance in primary colon carcinoma. This suggests an involvement of BRCA2 and putative BRCA3 in colon tumorigenesis in right-sided, replication error-negat...Continue Reading
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