The markers CKpan, P40, P63, Claudin4, CK5/6, CK7, NUT, and NapsinA effectively ruled out lung adenocarcinoma, squamous cell carcinoma, NUT carcinoma and Thoracic SMARCA4-deficient undifferentiated tumor (SMARCA4-UT) (see Table 1). The gene discussed is KRT7; the disease is nut midline carcinoma.