Table 1.

Definition of four BT target categories according to assessment and restaging taking into account the pattern of residual disease at BT for CT based contouring of the adaptive CTV-T_HR-CT.

Category of BT	Cervix	Parametrium	Vagina	Uterine corpus	bladder/rectum
IBT	No residual disease	No residual disease	No residual disease	No residual disease	No residual wall/mucosa involvement
	Or		Or	Or
	Residual disease confined to cervix		Residual disease < 2 cm of upper vagina	Residual disease in proximal third of utero-cervical junction
IIBT	Significant residual disease	Proximal parametrial disease	Residual disease within upper one third	Residual disease not beyond mid corpus	No residual wall/mucosa involvement
IIIBT	Significant residual disease	Distal/upto pelvic wall parametrial disease	Residual disease in mid or lower third	Residual disease into distal corpus/Up to fundus	No residual wall/mucosa involvement
IVBT	Any residual disease	Proximal parametrial disease	Residual disease within upper one third	Residual disease not beyond mid corpus	Residual disease involving neighboring organ wall/ mucosa (bladder/ rectum)
		Distal/upto pelvic wall parametrial disease	Residual disease in mid or lower third	Residual disease into distal corpus/Up to fundus	Residual disease involving neighboring organ wall/ mucosa (bladder/ rectum)