- The parameters Dtumor, tumor volume and TNr have predictive value of tumor response in univariate regression analysis with odds ratio (RR) of 0.959, respectively (95% confidence interval: 0.241 - 3.928); 0.620 (95% confidence interval: 0.411 - 0.963) and 0.959 (95% confidence interval: 0.929 - 0.990) with p of 0.007, 0.023 and 0.009, respectively.