CK18 was expressed in normal epithelial cells of most organs but absent in regular squamous epithelium. no less than an occasional weak CK18 positivity was observed in 90 of 115 (78.three%) tumor styles. vast-unfold CK18 positivity was witnessed in 37 (31.nine%) of tumor entities, together with adenocarcinomas in the lung, prostate, colon and pancr