Zhang, Kai CDK4/6 inhibitor palbociclib enhances the effect of pyrotinib in HER2-positive breast cancer. [electronic resource] - Cancer letters 04 2019 - 130-140 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 1872-7980 Standard No.: 10.1016/j.canlet.2019.01.005 doi Subjects--Topical Terms: Acrylamides--pharmacologyAminoquinolines--pharmacologyAnimalsApoptosis--drug effectsBreast Neoplasms--drug therapyCell Cycle Checkpoints--drug effectsCell Line, TumorCell ProliferationCyclin-Dependent Kinase 4--antagonists & inhibitorsCyclin-Dependent Kinase 6--antagonists & inhibitorsFemaleG1 Phase--drug effectsGene Expression Regulation, Neoplastic--drug effectsHumansMiceMice, Inbred BALB CMice, NudePiperazines--pharmacologyPyridines--pharmacologyReceptor, ErbB-2--geneticsResting Phase, Cell Cycle--drug effectsXenograft Model Antitumor Assays--methods