(A) The images of excised SW620 tumors implanted subcutaneously in athymic NCR nude mice (n = 8) that were treated with vehicle, regorafenib, paclitaxel, or the combination of regorafenib and paclitaxel, at the end of the 18-day treatment period. (B) The changes in tumor volume over time following the implantation. Data points represent the mean tumor volume for each treatment group (n = 8). Error bars, SEM. *P < 0.05 versus the vehicle group; #P < 0.05 versus the paclitaxel group; one-way ANOVA with Bonferroni post-test. (C) The mean weight (n = 8) of the excised SW620 tumors from the mice treated with vehicle, regorafenib, paclitaxel, or the combination of regorafenib and paclitaxel, at the end of the 18-day treatment period. Error bars, SEM. *P < 0.05 versus the vehicle group; #P < 0.05 versus the paclitaxel group; one-way ANOVA with Bonferroni post-test.