In December 2004, a team of scientists at Purdue University led by Qing Jiang released the results of a study on Vitamin E and cancer. They showed that human cancer cells—from both prostate and lung cancers—were prevented from spreading by gamma-tocopherol, a form of vitamin E. Jiang said, “This is the first time gamma-tocopherol has been shown to induce death in lab-grown human cancer cells while leaving healthy cells alone."
Vitamin E has several forms, with the gamma form being one of them. However, most supplements contain the alpha form. The gamma form is found abundantly in nuts, especially walnuts and pecans. So eating nuts may be a good way of avoiding some types of cancer.