Prostate cancer， Estrogen， Saw Palmetto

http://articles.mercola.com/sites/articles/archive/2012/01/02/use-of-pill-raise-prostate-cancer-risk.aspx?e_cid=20120102_DNL_art_1

Many conventional health experts believe the hormone testosterone causes prostate cancer -- but research actually suggests that estrogen may be the more likely culprit.

Like women, men also make estrogens such as estradiol, although (usually) in much lower amounts than women.

Even the characteristically "male" hormone testosterone can be converted into estradiol via the hormone aromatase – which is found in higher concentrations in fat tissue. 

While this process of testosterone-to-estrogen conversion is necessary for proper bone density and quality in men, for instance, it may also contribute to prostate growth and malignancy.

Fortunately, testosterone is also antagonist to estrogens like estradiol, which may explain why men with low testosterone are at greater risk of prostate cancer.

It may be, also, that men are being exposed to hidden sources of estrogen from the environment.

Estrogen-mimicking chemicals such as bisphenol-A, PFOA and phthalates are disturbingly widespread; as are soy foods that contain high levels of phytoestrogens, which are capable of mimicking estrogens and/or disrupting their cellular receptor sites. 

Not only that, but a wide range of heavy metals have been identified to have powerfully estrogenic properties.

These "metalloestrogens," as they are called, include aluminium, antimony, arsenite, barium, cadmium, chromium (Cr(II)), cobalt, copper, lead, mercury, nickel, selenite, and tin.  Recently, an interesting new theory has been proposed that suggests another route of estrogen exposure in men: water contaminated by women's birth control pills. Could this be the culprit in the rising number of prostate cancer cases?