Antioxidant Supplements, Genetics and Chemotherapy Outcomes
Cancer patients report widespread use of antioxidant supplements during chemotherapy, despite recommendations by the American Institute for Cancer Research and others that supplements should not be used during treatment. These guidelines are based upon the fact that numerous chemotherapeutic agents, as well as radiation therapy, exert their cytotoxic effects by generation of reactive oxygen species (ROS), which cause massive damage to DNA and proteins and trigger apoptosis, resulting in tumor and normal cell death. Thus, there is the concern that antioxidants may block the ROS-generated effects of therapy on tumor cells. There are no data based on sound epidemiological or clinical studies to support this hypothesis, however. In fact, some experimental studies have shown that antioxidants may potentiate the effects of chemotherapeutic drugs, while also lessening treatment-related toxicities. In this report, we review the literature regarding chemotherapy and radiation therapy as sources of oxidative stress, and present the current data regarding effects of antioxidant supplement use on normal and cancer cells. The role of antioxidant supplements, as well as the role of genetic variants in oxidative stress genes, in relation to cancer treatment toxicities and survival are discussed.
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Document Type: Review Article
Affiliations: Department of Epidemiology, Roswell Park Cancer Institute, Elm & Carlton Streets, Buffalo, NY 14263,USA.
Publication date: 2005-11-01
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- Current Cancer Therapy Reviews publishes frontier reviews on all the latest advances in clinical oncology, cancer therapy and pharmacology. The journal's aim is to publish the highest quality review articles dedicated to clinical research in the field. The journal is essential reading for all researchers and clinicians in cancer therapy.