MALAT1 and posterior cortical atrophy: To further validate the effects of MALAT1 on chemoresistance of PCa cells to DTX in vivo, PC3 cells, PC3‐DTX cells, MALAT1 overexpressed PC3‐DTX cells, MALAT1 knockdown PC3‐DTX cells, MALAT1 knockdown and miR‐145‐5p suppression PC3‐DTX cells as well as MALAT1 knockdown and AKAP12 overexpression PC3‐DTX cells were injected to mice to build in vivo models.