BRCA1 and cancer: Apart from founder mutations in Polish cancer patients, several other recurrent BRCA1 (185delAG, 3819del5, 3875del4, 5370C > T) and BRCA2 (886delGT, 4075delGT, 5467insT, 6174delT, 8138del5) mutations were detected [17–21, 24].