The Department of Medicines and Toxicology of the Faculty of Pharmacy organized a panel discussion entitled "The Importance of Hormone Melatonin in the treatment of breast cancer) where Dr. Asia Salman Abdullah explained: Recent studies have shown that the melatonin hormone secreted by the pineal gland is very important. In the treatment and reduction of the risk of breast cancer, where the breast cancer that causes it Estrogen 70% of breast cancer cases, dr. explained that melatonin Increases some enzymes and reduces some of them, reducing estrogen. effective in the body as well as works to reduce the number of alpha estrogen receptors which are considered more dangerous when estrogen is associated with it, since melatonin is very important when it is caused Breast cancer is hormonal or caused by exposure to toxic substances such as cadmium and also benefits in cases Obesity and also melatonin are important in increasing the efficiency of anti-estrogen drugs such as Tamoxine and trozol are also important in reducing the side effects of these drugs and the extract of these drugs. Studies have shown the importance of melatonin as a preventive and adjunct treatment in cases of breast cancer A lot of clinical studies are required on breast cancer patients to prove the importance of melatonin.