J Natl Cancer Inst. 2008 Jun 4;100(11):773-83. Epub 2008 May 27.

Should supplemental antioxidant administration be avoided during chemotherapy and radiation therapy?

Lawenda BD, Kelly KM, Ladas EJ, Sagar SM, Vickers A, Blumberg JB.

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Radiation Oncology Division, Breast Health Center, Naval Medical Center San Diego, San Diego, CA, USA. brian.lawenda@med.navy.mil

Abstract

Despite nearly two decades of research investigating the use of dietary antioxidant supplementation during conventional chemotherapy and radiation therapy, controversy remains about the efficacy and safety of this complementary treatment. Several randomized clinical trials have demonstrated that the concurrent administration of antioxidants with chemotherapy or radiation therapy reduces treatment-related side effects. Some data indicate that antioxidants may protect tumor cells as well as healthy cells from oxidative damage generated by radiation therapy and some chemotherapeutic agents. However, other data suggest that antioxidants can protect normal tissues from chemotherapy- or radiation-induced damage without decreasing tumor control. We review some of the data regarding the putative benefits and potential risks of antioxidant supplementation concurrent with cytotoxic therapy. On the basis of our review of the published randomized clinical trials, we conclude that the use of supplemental antioxidants during chemotherapy and radiation therapy should be discouraged because of the possibility of tumor protection and reduced survival.

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Bhutani M, Pathak AK. J Natl Cancer Inst. 2008 Sep 17; 100(18):1334; author reply 1334-5. Epub 2008 Sep 9.
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Should supplemental antioxidant administration be avoided during chemotherapy and radiation therapy?

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