CDK4/6 Tumor, Abemaciclib, Paclitaxel

"Phase 1b: About 3-6 patients enrollment is expected at dose level 1, -1 and -2. Dose reduction will be preceded with 3 patients/cohort until the first DLT with 4 weeks' observation. The recommend phase 2 dose (RP2D) will be defined.~level1: abemaciclib 100mg bid, D1-28 / paclitaxel 80mg/m2, IV. D1, 8, 15 Q 4 weeks level-1: abemaciclib 100mg bid, D1-28 / paclitaxel 70mg/m2, IV. D1, 8, 15 Q 4 weeks level-2: abemaciclib 50mg bid, D1-28 / paclitaxel 70mg/m2, IV. D1, 8, 15 Q 4 weeks~Phase2: At the RP2D dose level in phase I part, we will expand phase 2 study."