KRT20 and neoplasm: By correlating AR cytoplasmic, AR nuclear, and AR-V7 cytoplasmic staining with clinicopathological data and with each other, we found a positive correlation with perineural invasion (Pn), pathological tumor stage (pT), and CK20 staining and between these three staining patterns (AR cytoplasmic, AR nuclear, and AR-V7 cytoplasmic).