1. Lu SH, Hsieh LL, Luo FC, Weinstein IB (1988) Amplification of the EGF receptor and c-myc genes in human esophageal cancers. Int J Cancer 42: 502–505
2. Tsutsumi M, Sakamoto H, Yoshida T, Kakizoe T, Koiso K, Sugimura T, Terada M (1988) Coamplification of the hst-1 and int-2 genes in human cancers. Jpn J Cancer Res (Gann) 79: 428–432
3. Tsuda T, Tahara E, Kajiyama G, Sakamoto H, Terada M, Sugimura T (1989) High incidence of coamplification of hst-1 and int-2 genes in human esophageal carcinoma. Cancer Res 49: 5505–5508
4. Kitagawa Y, Ueda M, Ando N, Shinozawa Y, Shimizu N, Abe O (1991) Significance of int-2/hst-1 coamplification as a prognostic factor in patients with esophageal squamous carcinoma. Cancer Res 51: 1504–1508
5. Japanese Society for Esophageal Disease (1992) Guidelines for the Clinical and Pathologic Studies on Carcinoma of the Esophagus, 8th ed. Kanehara, Tokyo