strogen-receptor-positive tumors are shown to have lower than normal melatonin levels (3). A recent study at Tulane University School of Medicine in New Orleans found that estrogen-receptor-positive cells grew one-fourth to one-half as fast when treated with melatonin; however, melatonin had no effect on cancers that do not contain estrogen-receptor-positive cells (3). It is believed to somehow decrease the number of estrogen receptor cells and there by block the amount of estrogen that enters the tumor promoting its growth (3). Other studies have concluded that melatonin aids tamoxifen's ability to inhibit the growth of cancer cells (3).
             Melatonin may also be connected with other diseases, especially diseases associated with age, including heart disease and Alzheimer's (3). Melatonin levels fall as age increases so that a person over the age of 60 as a much lower production
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