This document relates to a composition comprising Cabazitaxel, or a pharmaceutically acceptable salt thereof, human serum albumin, and arginine, or a pharmaceutically acceptable salt thereof, wherein the human serum albumin and the Cabazitaxel, or a pharmaceutically acceptable salt thereof, in the composition have a ratio by weight of no less than 120:1. This document also relates to methods to prepare a composition comprising Cabazitaxel, or a pharmaceutically acceptable salt thereof, human serum albumin, and arginine, or a pharmaceutically acceptable salt thereof, as described herein.