1. Hase K (1993) Prognostic value of histological findings indicating biological attitude at the invasive front of rectal cancer (in Japanese with English abstract). Nippon Geka Gakkai Zasshi (J Jpn Surg Soc) 94:1022–1032
2. Suemasu K, Naruke T (1982) Prognostic significance of extranodal cancer invasion of mediastinal lymph nodes in lung cancer. Jpn J Clin Oncol 12:207–212
3. Watanabe H, Kato H, Tachimori Y, Yamaguchi H, Itabashi M (1989) Characteristics of the spread pattern for esophageal carcinoma (in Japanese with English abstract). Kyoubu Geka (Jpn J Thorac Surg) 42:682–689
4. Yoshinaka H, Shimazu H, Natsugoe S, Haraguchi Y, Shimada M, Baba M, Fukumoto T (1992) Histopathological features of lymph node metastases in patients with thoracic esophageal cancer (in Japanese with English abstract). Nippon Geka Gakkai Zasshi (J Jpn Surg Soc) 93:1289–1296
5. Japanese Research Society for Cancer of the Colon and Rectum (1983) General rules for clinical and pathological studies on cancer of the colon, rectum and anus. Jpn J Surg 13:557–573