2020年版WHO胃肿瘤组织学分类
a. Benign epithelial tumors/precursors良性上皮肿瘤/前驱病变
i. Glandular intraepithelial neoplasia (including intestinal type, foveolar type, gastric pit/crypt, serrated)腺上皮内瘤变（包括肠型、小凹型、胃小凹底部或隐窝型、锯齿状型）
1. Stomach glandular intraepithelial neoplasia，Low-grade
胃腺上皮内瘤变，低级别
2. Stomach glandular intraepithelial neoplasia，High-grade
胃腺上皮内瘤变，高级别
ii. Intestinal type adenoma/adenomatous polyp肠型腺瘤/腺瘤性息肉
1. Intestinal type adenoma/adenomatous polyp，Low-grade
2. Intestinal type adenoma/adenomatous polyp，High-grade
肠型腺瘤/腺瘤性息肉，高级别
b. Malignant epithelial tumors恶性上皮肿瘤
i. Adenocarcinoma腺癌
1. Tubular adenocarcinoma
管状腺癌
2. Parietal cell carcinoma
壁细胞癌
3. Adenocarcinoma with mixed subtypes
混合型腺癌
4. Papillary adenocarcinoma
乳头状腺癌
5. Micropapillary adenocarcinoma
微乳头状腺癌
黏液表皮样癌
7. Mucinous adenocarcinoma
黏液腺癌
8. Signet ring cell carcinoma
印戒细胞癌
9. Poorly cohesive carcinoma
低黏附性癌
10. Medullary carcinoma with lymphoid stroma
髓样癌伴有淋巴样间质
11. Hepatoid adenocarcinoma
肝样腺癌
12. Paneth cell carcinoma
潘氏细胞癌
ii. Squamous cell carcinoma
鳞状细胞癌
iii. Adenosquamous cell carcinoma
腺鳞癌
iv. Undifferentiated carcinoma未分化癌
1. Large cell carcinoma with rhabdoid phenotype
具有横纹肌样表型的大细胞癌
多形性癌
3. Sarcomatoid carcinoma
肉瘤样癌
4. Carcinoma with osteoclast-like giant cell
伴有破骨样巨细胞的癌
v. Gastroblastoma
胃母细胞瘤
vi. Neuroendocrine tumor神经内分泌肿瘤
1. Neuroendocrine tumor, Grade 1
神经内分泌肿瘤，G1级
2. Neuroendocrine tumor, Grade 2
神经内分泌肿瘤，G2级
3. Neuroendocrine tumor, Grade 3
神经内分泌肿瘤，G3级
胃泌素瘤
生长抑素瘤
6. Enterochromaffin cell carcinoid
肠嗜铬细胞类癌
7. ECL-cell carcinoid, malignant
vii. Neuroendocrine carcinoma神经内分泌癌
1. Large cell neuroendocrine carcinoma
大细胞神经内分泌癌
2. Small cell neuroendocrine carcinoma
小细胞神经内分泌癌
viii. Mixed neuroendocrine–non-–neuroendocrine neoplasm (MiNEN)
混合性神经内分泌-非神经内分泌肿瘤
