Stage 1: T1N0 or T2N0
Stage 2: T3N0 or T4N0
Stage 3: Any T, N1 or 2
Stage 4: Any T, Any N, M1
T1: invades into submucosa
T2: invades into muscularis propria
T3: invades through muscularis propria into subserosa or non-peritonealized pericolonic tissue
T4: invades through serosa into adjacent organs
N0: 0 LN mets (min 12 LN sampled)
N1: 1-3 LN
N2: >=4 LN
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