EOD Primary Tumor

Code	Description	SS2018 T
000	In situ, intraepithelial, noninvasive	IS
100	Confined to tissue or organ of origin Localized, NOS	L
200	Adjacent connective tissue Adjacent organ(s)/structure(s) - Descending aorta - Esophagus - Large (named) artery(ies) - Large (named) vein(s) - Pericardium (parietal, visceral [pericardium]) - Phrenic nerve(s) - Pleura (parietal, visceral, NOS) - Sternum - Sympathetic nerve trunk(s) - Thoracic duct - Thymus - Trachea - Vertebra(e)	RE
700	Further contiguous extension	D
800	No evidence of primary tumor	U
999	Unknown; extension not stated Primary tumor cannot be assessed Not documented in patient 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)