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Several medications and vitamins may also help prevent prostate cancer. Two dietary supplements, vitamin E and selenium, may help prevent prostate cancer when taken daily. Estrogens from soybeans and other plant sources (called phytoestrogens) may also help prevent prostate cancer. The selective estrogen receptor modulator drug toremifene has shown promise in early trials. Two medications which block the conversion of testosterone to dihydrotestosterone, finasteride and dutasteride, have also shown some promise. As of 2006 the use of these medications for primary prevention is still in the testing phase, and they are not widely used for this purpose. The problem with these medications is that they may preferentially block the development of lower-grade prostate tumors, leading to a relatively greater chance of higher grade cancers, and negating any overall survival improvement. Green tea may be protective (due to its polyphenol content), though the data are mixed. A 2006 study of green tea derivatives demonstrated promising prostate cancer prevention in patients at high risk for the disease. In 2003, an Australian research team led by Graham Giles of The Cancer Council Australia concluded that frequent masturbation by males appears to help prevent the development of prostate cancer.
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