The squamous cell lines included in the further analyses (HCC-95 and HCC-1588) were also stained for the markers commonly expressed in adenocarcinomas (CK7 and TTF-1) and the selected adenocarcinoma cell lines (NCI-H1975 and A549) were stained for squamous markers (p40 and CK5). Here, TTF1 is linked to hepatocellular carcinoma.