Whether vitamin E can lower people's risk for developing cancer may depend on a genetic variant.<br />According to UPI, a gene known as catechol-O-methyltransferase plays a critical role in the matter.<br />While some studies showed vitamin E had a beneficial effect, clinical trials that did not use placebos showed no benefits.<br />That led researchers to believe vitamin E was always ineffective. Now, they say, they were wrong. <br />
