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Infrequent Mutation in the BRCA2 Gene in Esophageal Squamous Cell Carcinoma

National Cancer Institute, Bethesda, Maryland 20892 [N. H., C. W., A. M. G., M. J. R., S. M. D., P. R. T., M. R. E-B.]; Shanxi Cancer Hospital, Taiyuan, Shanxi 030013, People’s Republic of China [G. L., W-J. L., Z-Z. T., Q-H. W., T. D.]; Cancer Institute and Hospital, Chinese Academy of Medical Sciences, Beijing 100021, People’s Republic of China [J. H.]; and Information Management Services, Inc., Silver Spring, Maryland 20904 [C. G.]

Purpose: Previous studies have shown a high rate of allelic loss in esophageal squamous cell carcinoma (ESCC) in the vicinity of the BRCA2 gene. We aimed to assess whether the tumor suppressor gene BRCA2 was the inactivation target for allelic loss observed on chromosome 13q in ESCC.

Experimental Design: We examined the entire coding sequence of the BRCA2 gene for mutations using single-strand conformation polymorphism analysis and DNA sequencing in 56 ESCC patients from Shanxi, China.

Results: Eight mutations were identified in 5 patients (9%), including 3 with germ-line mutations and 2 with only somatic mutations. However, all but 1 of the mutations were missense or silent changes and of unknown significance. Evidence for potential biallelic inactivation was seen in only 4 (7%) cases.

Conclusions: BRCA2 mutations occur in ESCC but are infrequent and of unknown consequence. The putative target tumor suppressor gene corresponding to the high rate of chromosome 13q allelic loss remains unknown.

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				N. Hu, A. M. Goldstein, P. S. Albert, C. Giffen, Z.-Z. Tang, T. Ding, P. R. Taylor, and M. R. Emmert-Buck Evidence for a Familial Esophageal Cancer Susceptibility Gene on Chromosome 13 Cancer Epidemiol. Biomarkers Prev., October 1, 2003; 12(10): 1112 - 1115. [Abstract] [Full Text] [PDF]