BRCA1 and breast cancer: Thirteen [35,36,37,38,39,40,41,42,43,44,45,46,47], 12 [36,39,44,45,47,48,49,50,51,52,53,54], 10 [40,42,43,44,47,49,54,55,56,57], 18 [34,36,38,39,41,44,45,46,47,48,49,50,51,52,55,56,58,59], 9 [38,43,45,49,51,52,56,60,61], and 12 [34,35,38,45,47,49,50,51,52,58,62,63] studies reported data regarding the association between BRCA1 gene methylation status and breast cancer histology, disease stage, tumor grading, patients’ lymph nodal status, disease molecular classification, and patients’ menopausal status, respectively.