RESUMO
BACKGROUND: Germline mutations in p53 are associated with the Li-Fraumeni Syndrome which is characterized by childhood cancers, including pediatric adrenal cortical carcinomas and early onset breast cancer. The high incidence of adrenal cortical carcinomas in southern Brazil is mostly attributed to the R337H mutation in TP53. The relatively high population frequency of this mutation in southern Brazil, along with the clustering of early onset breast cancer in Li-Frameni families, suggests this mutation may also be a low-penetrance breast cancer susceptibility polymorphism. METHODS: We undertook this study to evaluate the frequency of the R337H mutation in breast cancer patients from Rio de Janeiro, Brazil. R337H mutation status was determined in 390 unselected breast cases and 324 controls identified from clinics in Rio de Janeiro, Brazil using a PCR-based assay. RESULTS: Two of the breast cancer cases (0.5%) and none of the controls carried the mutation. Both cases had an early age at diagnosis (< 40 years old) and a family history of breast and other cancers. CONCLUSIONS: These data suggest genetic screening of young onset breast cancer patients should include testing for the R337H mutation.