On immunohistochemical analysis, the adenocarcinoma cells showed diffuse strong immunopositivity for Keratin 7 while immunonegativity for EMA, Keratin 5/6, p63, p40, Androgen receptor (AR), gross cystic disease fluid protein 15 (GCDFP-15), Her2Neu, BerEp4, S100, SMA and calponin. This evidence concerns the gene KRT7 and adenocarcinoma.