We first compared the CDK1 and Cyclin B1 protein levels in several common TNBC cell lines (MDA-MB-231, MDA-MB-468, HCC1937, and SUM149PT) and non-TNBC breast cancer cell lines (T47D and MCF-7) with those in 293 cells and normal HDFs. The gene discussed is CCNB1; the disease is breast carcinoma.