Stem cells are effective against breast cancer, but are still in the research phase. Stem cell is a brand new technology in the field of cancer treatment. By utilizing the undifferentiated and multi-differentiated ability of stem cells, a large number of healthy cytokines can be formed in the body, so as to wake up and replace the cancerous and damaged cells, and then accurately act on the cancerous parts to restore the normal functions of the body and the breasts, which has an outstanding effect, but it is still in the stage of research, and has not been promoted formally. Theoretically speaking, stem cells belong to the new treatment means without toxic side effects, high safety, and outstanding effect, but there is no large amount of clinical data to support the specific therapeutic effect needs some time, and may be a major breakthrough in the treatment of breast cancer in the future.