Vitamin E and cancer prevention: recent advances and future potentials

Area of Science:

• Nutritional Science
• Oncology
• Molecular Biology

Background:

• Animal and in vitro studies suggest dietary vitamin E may reduce chemical- and radiation-induced cancer risk.
• Certain vitamin E forms, like alpha-tocopheryl succinate (TS), demonstrate anti-cancer properties in vitro, unlike others such as alpha-tocopherol (alpha-T).

Purpose of the Study:

• To evaluate the relative efficacy of different vitamin E forms in cancer prevention.
• To highlight the limitations of epidemiologic studies and the necessity of intervention trials for human cancer prevention research.

Main Methods:

• In vitro experiments on animal and human tumor cells.
• Review of existing animal and in vitro data.
• Discussion of human trial methodologies.

Main Results:

• Alpha-tocopheryl succinate (TS) induced differentiation and inhibited growth in specific tumor cells in culture.
• TS reduced adenylate cyclase activity and expression of c-myc and H-ras oncogenes in tumor cells.
• Alpha-tocopherol (alpha-T), alpha-tocopheryl acetate (alpha-TA), and alpha-tocopheryl nicotinate (alpha-TN) were ineffective in vitro.

Conclusions:

• Alpha-tocopheryl succinate (TS) exhibits specific anti-cancer effects in vitro.
• Human intervention trials are the most suitable method for evaluating vitamin E's role in cancer prevention.
• Ongoing human trials are investigating vitamin E's potential in cancer prevention.