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GTVA included the primary anal tumor

Involved nodal CTVs:

CTVN 50 metastatic nodal regions ≤ 3 cm;

and CTVN 54 metastatic nodal regions > 3 cm.

Elective nodal CTVs

Kachnic LA, Winter K, Myerson RJ, et al. Int J Radiat Oncol Biol Phys. 2013