1058 / 1311
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