Epirubicin hydrochloride is the main isomer of doxorubicin, which is the trans configuration of C4 hydroxyl group in the amino sugar part of doxorubicin. It can directly embed into DNA, form a complex with the double helix structure of DNA, block the formation of DNA dependent RNA, and have the kinetic energy to form superoxide radicals. Single drug has a broad spectrum of inhibitory effects on many kinds of tumors, including breast cancer, malignant lymphoma, soft tissue sarcoma and gastric cancer. Studies have shown that the drug also has antitumor activity on malignant melanoma and colon cancer.