FIGURE 4. Changes in the representative index for the ROI with the highest SUV_cor at baseline ¹⁸F-FDG PET for all 12 patients at baseline, day 1, day 20, and the end of chemotherapy. Compared with that at baseline, the SUV at day 1 was significantly decreased (P = 0.0002, paired t test). The SUV at day 20 was further significantly decreased compared with that at day 1 (P = 0.01), but no significant difference was observed between day 20 and the end of chemotherapy (P = 0.37). N/S = nonsignificant.