Dosimetric comparison of different radiation techniques (IMRT vs. 3-dimensional) of the “true” (deep) ano-inguinal lymphatic drainage of anal cancer patients

Table 2 Dose statistics of different subvolumes inside the ano-inguinal lymphatic drainage (AILD) with two different radiation techniques

Structure	Technique	Dose (Gy)				Volume (%)
Structure	Technique	Dmean	Dmeadian	D98%	D2%	V30Gy
AILDcranial	3D-RT	49,0	50,7	36,9	53,3	98,7
	IMRT	47,3	49,5	33,6	51,9	98,5
	p-value	*0,008*	*0,008*	0,075	*0,008*	0,236
AILDcaudal	3D-RT	34,7	35,4	11,3	52,3	66,5
	IMRT	32,1	32,0	10,7	51,4	57,0
	p-value	*0,011*	*0,011*	0,514	*0,018*	*0,011*
Level1	3D-RT	41,2	42,9	22,4	52,5	85,3
	IMRT	39,5	40,4	21,6	51,6	81,0
	p-value	*0,013*	*0,015*	0,285	*0,011*	0,110
Level2	3D-RT	36,5	37,4	15,4	51,9	73,4
	IMRT	33,8	33,7	15,6	51,4	62,6
	p-value	*0,011*	*0,012*	0,722	0,183	*0,008*
Level3	3D-RT	26,3	25,0	9,9	48,5	36,0
	IMRT	22,3	20,1	9,5	44,4	25,2
	p-value	*0,011*	0,015	0,813	0,173	*0,011*

RT radiation therapy, AILD ano-inguinal lymphatic drainage, Gy gray, 3D 3 dimensional, IMRT intensity modulated radiation therapy
Level1: 1 cm of AILD caudally of the anal verge, Level2: 1-2 cm of AILD caudally of the anal verge, Level3: 3 cm of AILD caudally of the anal verge
Boldface indicates values that are statistically significant

ISSN: 1748-717X