(“fertility preservation” OR “oocyte cryopreservation” OR “embryo cryopreservation”) AND (“BRCA mutation” OR “BRCA1” OR “BRCA2”) AND (“hormone receptor status” OR “ER positive” OR “PR positive” OR “triple-negative breast cancer” OR “TNBC”) AND (“breast cancer”). This evidence concerns the gene BRCA2 and breast cancer.