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). Here, TTF1 is linked to neoplasm.