EOD Primary Tumor

Code Description SS2018 T
000 In situ, intraepithelial, noninvasive IS
100 Any size tumor - Invasive tumor confined to + Intramucosal, NOS + Lamina propria (including in a polyp) + Mucosa, NOS + Muscularis mucosae (including in a polyp) + Submucosa (superficial invasion) (including in a polyp) Confined to stomach, NOS Localized, NOS L
200 Any size tumor - Invasion of muscularis propria L
400 Extension through wall, NOS Invasion through muscularis propria or muscularis, NOS Perimuscular tissue invaded Subserosal tissue/(sub)serosal fat invaded L
500 Extension to adjacent (connective) tissue WITHOUT perforation of visceral peritoneum covering these structures Gastric artery Ligament(s) - Gastrocolic - Gastrohepatic - Gastrosplenic Omentum (greater, lesser, NOS) Perigastric fat RE
600 Invasion of/through - Mesothelium - Serosa - Tunica serosa - Visceral peritoneum Colon/mesocolon (including transverse and flexures) Diaphragm Duodenum (via serosa) Esophagus (via serosa) Ileum Jejunum Liver Pancreas Small intestine, NOS Spleen RE
700 Aorta Abdominal wall Adrenal (suprarenal) gland Celiac (axis) artery Kidney Retroperitoneum Further contiguous extension D
800 No evidence of primary tumor U
999 Unknown; extension not stated Primary tumor cannot be assessed Not documented in medical record Death Certificate Only U
(1) Fritz AG, Ries LAG (eds). **SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998)**, National Cancer Institute, NIH Pub. No. 98-2313, Bethesda, MD, 1998 (2) Young JL Jr, Roffers SD, Ries LAG, Fritz AG, Hurlbut AA (eds.). **SEER Summary Staging Manual-2000: Codes and Coding Instructions**, National Cancer Institute, NIH Pub. No. 01-4969, Bethesda, MD, 2001. (3) Collaborative Stage Work Group of the American Joint Committee on Cancer. **Collaborative Stage Data Collection System User Documentation and Coding Instructions, version 02.05**. American Joint Committee on Cancer (Chicago, IL) (4) Gress, D.M., Edge, S.B., Gershenwald, J.E., et al. **Principles of Cancer Staging**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017 (5) Woltering, E.A., Bergsland, E.K., et al. **Neuroendocrine Tumors of the Stomach**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017 (6) **Neuroendocrine Tumors of the Stomach,** from the AJCC Cancer Staging System Version 9 (2023). Used with permission of the American College of Surgeons, Chicago, Illinois.