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The aggressive nature of breast cancer in young women may be related to the occurrence of mutations in the BRCA1/BRCA2 genes responsible for DNA repair. Despite of cases are associated with and without a family history of breast and ovarian cancer such changes are present in only a small percentage of cases, which corresponds to 80-10% of patients with familial breast cancer and 3.2-10.6% of women with breast cancer non-familial (sporadic). The penetrance rate of this variability is not well understood today, but we know that reproductive factors, risks posed by particular mutations and other genetic modifiers The expression profile of miRNAs can also reveal changes in the regulatory processes that distinguish the appearance of cancer familial and sporadic breast cancer in young patients. miRNAs have been described as related to the aggressiveness of breast cancer and the sensitivity of human mammary tumor strains to anti- estrogen. Such evidence indicates that the molecular mechanisms responsible for the aggressive behavior of breast carcinoma in young women has not been sufficiently clarified.

BIOSYNTHESIS OF microRNAs AND THEIR ROLE IN GENE EXPRESSION PROFILING IN BREAST CANCER