Colorectal Cancer pTis TNM Finding v7

**Semantic type:** Finding

**Definition:** Colorectal cancer with a finding of carcinoma in situ: intraepithelial or invasion of lamina propria. Note: Tis includes cancer cells confined within the glandular basement membrane (intraepithelial) or mucosal lamina propria (intramucosal) with no extension through the muscularis mucosae into the submucosa. (from AJCC 7th Ed.)