[Objective] To investigate the effectiveness of combined treatment of ATRA and doxorubicin on CRPC. [Methods] PC3 cell line was used as CRPC model,MTT assay was used to determine the inhibitory effect of combined treatment on cells. Apoptosis and cell cycle arrest of cells were analyzed by flow cytometry. RT-PCR was introduced to detect the expression of apoptosis-related genes. [Results] Combined treatment of ATRA( 2 μmol/L) and doxorubicin( 80 nmol/L) synergistically inhibited the proliferation of PC3 cel...