No significant differences were found in terms of sex, age, smoking history, tumor size, lymph node metastasis, vascular invasion, carcinomatous lymphangitis, mediastinal invasion, SVCC syndrome, tumor stage, or metastases (brain, pleura, lung, adrenal) or markers (CK, Syn, CgA, TTF-1, Ki-67). The gene discussed is MKI67; the disease is neoplasm.