BRCA2 and breast cancer: Researchers have discovered, and are continuing to discover, other abnormal genes e.g. BRIP1, CDH1, PTEN, TP53, and the STK11 genes that are less common than BRCA1, BRCA2, and PALB2 but also can raise BC risk in each population (Easton et al., 2015; Lincoln et al., 2015; Shiovitz and Korde, 2015; Daly et al., 2017; Abbad et al., 2018; Lilyquist et al., 2018; Momozawa et al., 2018).