Table 3.

Comparison of tumour regression grade in patients with R0 resection

	IMRT-SIB But-Hadzic et al.16 N = 46	3D CRT Focas et al.32 N = 385		IMRT-SIB But-Hadzic et al.16 N = 46	IMRT-SIB Li et al.10 N = 58
			p			p
TRG 4	12 (26%)	40 (10%)	0.004	12 (26 %)	19 (33 %)	0.302
TRG 2–3	29 (63%)	254 (66%)	0.404	29 (63 %)	20 (35 %)	0.003
TRG 0–1	5 (11%)	91 (24%)	0.031	5 (11 %)	19 (32 %)	0.007

3D CRT = 3D conformal radiotherapy; IMRT-SIB = intensity modulated radiation therapy with simultaneous boost; TRG = tumour regression grading²³