SEER Training Modules

TX N0 M0 Stage Group 0a

TX (Primary tumor cannot be assessed) N0 (No lymphadenopathy on CT scan) M0 (No distant metastasis seen on imaging) Stage Group 0a. Per page 6, Rule 4, of TNM 6th edition: "carcinoma in situ is an exception to the stage grouping guidelines... pTis cN0 cM0, clinical stage group 0 is appropriate".