Immunohistochemical staining results were as follows (Figure 2): panCK (AE1/AE3), CK7 (OV-TL12/30), TTF-1 (SP141), and NUT (GTX34106) negative; SALL-4 (SP289) reactive; SOX2 (BP6123) focally reactive; tumor cells negative for CD34 (HK11190) and vessels reactive for CD34 (HK11190); SMARCA4 (EPNCIR111A) and SMARCA2 (HPA029981) completely lost. The gene discussed is SMARCA2; the disease is neoplasm.