Abstract
Huaier granule, which is clinically used in Japan as a health food, is originally a traditional Chinese medicine for immune dysfunction, such as cancer, in China. Huaier guanule emerged with abundant evidence, and is being prescribed to hepatocellular carcinoma, breast cancer, lung cancer, gastric cancer, et al. as indications in China. This review focused on the clinical evidence of Huaier guanule associated to breast cancer.