A2.

Histological classification and grade of gastric cancer*

Histological classification	ICD-O code
*, WHO histological classification of gastric tumors (based on the 4th edition of “WHO classification of tumors of the digestive system” in 2010)
Carcinoma
Adenocarcinoma	8140/3
Papillary adenocarcinoma	8260/3
Tubular adenocarcinoma	8211/3
Mucinous adenocarcinoma	8480/3
Signet-ring cell carcinoma and other poorly cohesive carcinomas	8490/3
Mixed carcinoma	8255/3
Adenosquamous carcinoma	8560/3
Carcinoma with lymphoid stroma (medullary carcinoma)	8512/3
Hepatoid adenocarcinoma	8576/3
Squamous cell carcinoma	8070/3
Undifferentiated carcinoma	8020/3
Neuroendocrine neoplasm
Neuroendocrine tumor (NET)
NET G1	8240/3
NET G2	8249/3
Neuroendocrine carcinoma (NEC)	8246/3
Small cell carcinoma	8041/3
Large cell neuroendocrine carcinoma	8013/3
Mixed adenoneuroendocrine carcinoma	8244/3
EC cells, 5-HT-secreting NET	8241/3
Gastrin-secreting NET (gastrinoma)	8153/3