Diffusion-weighted magnetic resonance imaging for predicting the response of rectal cancer to neoadjuvant concurrent chemoradiation

Table 3 Mean tumor apparent diffusion coefficient values and the P values for the comparisons with the pretreatment values

	Apparent diffusion coefficient values (× 10-3 mm2/s)
	Week 0	Week 1	Week 2	Week 3	Week 4	Week 5
All (n = 15)	0.749	0.772	0.884	0.800	0.766	0.839
P value	-	0.672	0.004	0.077	0.586	0.033
T downstage (n = 8)	0.703	0.720	0.890	0.724	0.691	0.744
P value	-	0.964	0.011	0.406	0.578	0.284
No T downstage (n = 7)	0.803	0.824	0.878	0.876	0.851	0.948
P value	-	0.617	0.185	0.117	0.430	0.074
Good regression (n = 9)	0.659	0.671	0.852	0.696	0.674	0.714
P value	-	0.909	0.004	0.212	0.617	0.251
Poor regression (n = 6)	0.886	0.907	0.933	0.938	0.904	1.027
P value	-	0.669	0.372	0.264	0.785	0.086