Although Korean women have one of the lowest rates of breast cancer worldwide, they are diagnosed at an earlier age and have a surprisingly high incidence of a genetic mutation known to contribute to breast cancer, according to researchers. In addition, though the prevalence of BRCA1 and BRCA2 mutations is high, there is a low frequency of breast and ovarian cancers among family members.From Yale University:Study finds high rate of genetic mutation in younger Korean women with breast cancer
Although Korean women have one of the lowest rates of breast cancer worldwide, they are diagnosed at an earlier age and have a surprisingly high incidence of a genetic mutation known to contribute to breast cancer, according to a Yale researcher.
In addition, though the prevalence of BRCA1 and BRCA2 mutations is high, there is a low frequency of breast and ovarian cancers among family members, said lead author Bruce Haffty, M.D., professor of therapeutic radiology at Yale School of Medicine.
”Typically you see a lot of breast and ovarian cancers among families with the BRCA1 and BRCA2 mutations,” Haffty said. ”The majority of breast cancer patients found to have BRCA1 or BRCA2 also reveal a family history of breast and/or ovarian cancer in at least one first degree relative.”
Haffty analyzed a sample of 60 breast cancer patients 40 or younger treated at a hospital in Seoul, Korea. The average age at which breast cancer is diagnosed in women in the United States is 50-60: in Korea, the average age is 40-50.
Nine patients of the 60 patients had the genetic mutation in one of the two genes and two patients had mutations in both BRCA1 and BRCA2 genes. Only two of the patients had a family history of breast or ovarian cancer.
”These data suggest that there may be different genetic and etiologic factors affecting transmission and penetrance of the BRCA genes in Korean patients with breast cancer who are diagnosed at a young age,” Haffty said. ”One possible environmental effect might be attributed to the Asian diet or caloric intake.”
He plans to follow up with a larger study funded by the Susan Komen Foundation that will include an additional 50 women. The study also will include a large number of African-American women because the onset of breast cancer is younger for these women, too.