Immunohistochemical examination showed that tumor cells showed diffusely and intensely positive for MUC5AC, MUC6, CD117 (Fig. 2d–f), focal and patchy positivity of HepPar-1(Fig. 2g), multifocal positivity of S100P, MUC1 and negative for LKB1(Fig. 2h), CK20, MUC2, CDX-2. This evidence concerns the gene STK11 and neoplasm.