of borderline significanceP =0.052
In contrast, RG7388 at 1 and 2 μ M did not significantly reduce the GI 50 of vincristine in the same cells; however, 5 μ M RG7388 did potentiate vincristine activity by 13.3-fold, which was of borderline significance ( P =0.052, paired t -test, Figure 3C and Table 2 ).