In the overall group (n = 150, 300 CBs), type OK1 was found in 40% of BCs, type OK3a in 1%, type OK3b in 2%, type CK1 in 9%, type CK3 in 5.67% and type SK2a in 42.33% of the bilateral BC group (Figure 2A). The gene discussed is KRT1; the disease is breast cancer.