G0S2 is epigenetically silenced in human cancer cell lines. A, RT-PCR analysis of G0S2 expression in human cancer cell lines and PFFs, in the presence or absence of AZA/TSA treatment. B, Immunoblot analysis in a subset of cell lines. C, qRT-PCR analysis of G0S2 expression in 10 individual human normal, adenocarcinoma and squamous cell carcinoma samples. Error bars represent SD.