ike prostate cancer, which develops in epithelial cells lining the prostate gland.This is a paradigm shift for all epithelial tumors - such as cancers of the lung, breast, colon, ovary, liver and prostate - which are the most common types of cancer and account for most deaths due to cancer, says Chinnaiyan, who directs the Bioinformatics Core at the U-M Comprehensive Cancer Center.