The pre-RT tumor diameters and tumor volumes of the 22 patients with positive pre-RT DCE-MRI findings were significantly correlated to pre-RT PSA levels (Spearman rank correlation coefficient for correlation between tumor volume and PSA level = 0.83, p<0.001 (Figure2a); Spearman rank correlation coefficient for correlation between tumor diameter and PSA level = 0.47, p=0.03 (Figure2b)). The gene discussed is KLK3; the disease is neoplasm.