SMAD4 and non-small cell squamous lung carcinoma: The results of IHC staining for CDH17, GPA33, MUC2, MUC6, SATB2, and SMAD4, in primary non-squamous non-small-cell lung cancers and pulmonary metastases from the GI tract, are presented in Table 2 together with data for CDX2, CK7, CK20, and TTF-1 from our previous annotations for comparison [4, 13].