There is one clinical trial.
RATIONALE: Studying samples of DNA in the laboratory from women who are BRCA1/BRCA2 mutation carriers may help doctors learn more about cancer and identify biomarkers related to cancer. PURPOSE: This research study is looking at breast cancer risk in women who are BRCA1/BRCA2 mutation carriers.
Previously collected DNA samples are analyzed for genetic variants in selected candidate genes (rs16942 in BRCA1, rs2237060 in RAD50, "SNP3", and rs2241193 in IGFBP5).