Cancers of the Esophagus and Small Bowel, Precancerous States of the Large Bowel, and Gastrointestinal Stromal Tumors
Definitions of TNM Primary tumor (T)a TX Primary tumor cannot be assessed T0 No evidence of primary tumor Tis High-grade dysplasiab T1 Tumor invades lamina propria, muscularis mucosae, or submucosa…