From: Optimal organ-sparing intensity-modulated radiation therapy (IMRT) regimen for the treatment of locally advanced anal canal carcinoma: a comparison of conventional and IMRT plans
N0–N1 group
N2–N3/T4 group
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T2 N0
T3 N0
T2 N1
T3 N1
T4 N2
T1 N2
T4 N1
T3 N2