Helical tomotherapy and volumetric modulated arc therapy: New therapeutic arms in the breast cancer radiotherapy

Table 1 Definition of planning target volume

	HT	VMAT
Breast PTV	[Breast CTV + 5 mm - (PTV tumor bed + 2 mm)] - 3 mm cutaneous	[Breast CTV + 7 mm - (PTV tumor bed + 2 mm)] - 5 mm cutaneous
Tumor bed PTV	(CTV tumor bed + 5 mm) - 3 mm cutaneous	(CTV tumor bed + 7 mm) - 5 mm cutaneous
Supra infra clavicular ± axillary PTV	(CTV SN + 5 mm) - 3 mm cutaneous	(CTV SN ± axillary + 7 mm) - 5 mm cutaneous
IMC PTV	(CTV IMC + 5 mm) - PTV breast	CTV IMC + 7 mm

PTV: Planning target volume; CTV: Clinical target volume; IMC: Internal mammary chain; SN: Supra and infra clavicular nodes (Levels II-III-IV); HT: Helical tomotherapy; VMAT: Volumetric modulated arc therapy.