1. Japanese Gastric Cancer Association. Japanese classification of gastric carcinoma: 3rd English edition. Gastric Cancer. 2011;14:101–12.
2. Lauwers GY, Carneiro F, Graham DY, Curado MP, Franceschi S, Montgomery E, et al. Gastric carcinoma. In: Bosman FT, Carneiro F, Hruban RH, Theise ND, editors. WHO classification of tumours of the digestive system. 4th ed. Lyon: International Agency for Research on Cancer; 2010. p. 48–58.
3. Terayama H, Masuko Y, Horie T, Koike Y, Ozaki S, Sano S, et al. A case of undifferentiated carcinoma at the stomach with unusual lymphnode metastasis (in Japanese with English abstract). J Sapporo City Gen Hosp. 1990;50:65–8.
4. Matsuzaka T, Ito K, Makihata T, Matsumoto M, Kubokawa M, Kubo H, et al. A case of gastric undifferentiated carcinoma (in Japanese). Jpn J Clin Exp Med. 2001;78:927–9.
5. Baba H, Fujiwara N, Nakamura H, Tanaka K, Kuwabara H, Tamai S, et al. Adjuvant Chemotherapy of S-1 and CDDP for undifferentiated adenocarcinoma of the stomach (in Japanese with English abstract). Jpn J Cancer Chemother. 2008;35:2051–3.