CDCA2 and cancer: To investigate mRNA and protein expression of CDCA2 identified as a cancer-related gene in our previous microarray data [8], we performed qRT-PCR and Western blot analyses using six OSCC-derived cell lines (HSC-2, HSC-3, HSC-4, Ca9-22, Ho-1-u-1, and Sa3), the HeLa cell line, and the HNOKs.