Table 3.

Univariate analysis of risk factors associated with disease-free survival and overall survival rates (n = 20)

Parameters	Disease-free survival (p value)	Overall survival (p value)
	Clinical parameters
Age	0.338	0.556
Tumour location	0.396	0.752
Stage	1.000	0.198
Pre-treatment values of functional parameters and tumour volume
ADC (x 10-3 mm2/s)	0.856	0.012*
Ktrans (min-1)	0.116	0.026*
Ve	0.754	0.293
Vp	0.165	0.342
Tumour volume	0.959	0.048*
Relative changes after 10 Gy of functional parameters and tumour volume
ΔADC (%)	0.740	0.061
ΔKtrans	0.688	0.014*
ΔVe	0.957	0.405
ΔVp	0.672	0.077
ΔTumour volume (ml)	0.495	0.486

^* = significant predictor at univariate analysis; ADC = Apparent diffusion coefficient; K_trans = volume transfer constant; V_e = extracellular extravascular volume fraction; V_p = plasma volume fraction; Δ = relative change in the parameter