Combined inhibition of PI3K/mTOR (PF-04691502) and MEK (PD-0325901) leads to regression of transplanted KrasG12D; Ptendel ovarian adenocarcinomas in vivo…Combining PF-04691502 and PD-0325901 led to a greater effect than either agent alone, with striking tumor regression (>20% volume reduction) in all 9 mice (mean volume 80.7% ± 5.0 smaller on day 7 compared with day 0 tumor volume)...