The present disclosure provides a method for treating breast cancer and/or treating breast cancer metastasis in a subject in need of such treatment comprising administering to said subject an effective amount ofCrassocephalum rabensextract and optionally a pharmaceutically acceptable carrier or excipient.本發明係關於一種於一需要此等治療之個體中治療乳癌及/或治療乳癌轉移之方法,其包含給予該個體有效量之昭和草(Crassocephalum rabens)萃取物及視情況之醫藥上可接受之載劑或賦形劑。