Primary Tumor (T)Tis, Carcinoma in situ: intraepithelial or invasion of lamina propia. aT1, Tumor invades submucosa.T2, Tumor invades muscularis propria.T3, Tumor invades through the muscularis propria into pericolorectal tissues.T4a, Tumor penetrates to the surface of the visceral peritoneum. bT4b, Tumor directly invades or is adherent to other organs or structures.b,cLymph Nodes (N)N0, no regional lymph node metastasisN1, metastasis in 1–3 lymph nodesN1a, metastasis in 1 lymph nodeN1b, metastasis in 2–3 lymph nodesN1c, tissue tumor deposits without lymph node metastasisN2, metastasis in >4 lymph nodesN2a, metastasis in 4–6 lymph nodesN2b, metastasis in >7 lymph nodesDistant Metastasis (M)M0, no distant metastasisM1a, metastasis confined to one site or organM1b, metastasis in peritoneum or > one site or organ
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