- With Mayo Clinic medical oncologist
Timothy Moynihan, M.D.
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Timothy Moynihan, M.D.
Timothy Moynihan, M.D.
"As a practicing medical oncologist, I meet with patients and families every day to help manage their course through this disease called cancer. This experience provides unique insight into the needs of cancer patients, their families and loved ones and brings into sharp focus the need for reliable information to be readily available in terms that can be easily understood." — Dr. Timothy Moynihan
Dr. Timothy Moynihan believes that providing consumers accurate, timely information on the broad, complex topic of cancer is the biggest challenge facing medical Web sites. As the guiding force behind our cancer coverage, he makes sure Mayo Clinic meets the test.
Dr. Moynihan, born in Las Vegas, N.M., but raised in Denver, is a consultant in medical oncology at Mayo Clinic and an associate professor at Mayo Clinic College of Medicine. He is board certified in internal medicine, medical oncology, and hospice and palliative care medicine. He did his medical oncology training at Johns Hopkins Hospital in Baltimore, and then went on to the University of Minnesota and St. Paul Regions Medical Center in St. Paul, Minn., for seven years before moving to Mayo Clinic in 1999. Dr. Moynihan is director of the palliative care program at Mayo Clinic and associate medical director of the Mayo Clinic hospice.
Dr. Moynihan currently serves as the education chair for the Department of Medical Oncology and fellowship program director. Four times he has been selected as Teacher of the Year in medical oncology and elected to the Teacher of the Year Hall of Fame. Past honors include distinguished clinical teacher at the University of Minnesota Medical School, best internist at the Medical College of Wisconsin and recipient of The Upjohn Achievement Award for Excellence in Medicine. He serves on several national committees for the American Society of Clinical Oncology.
"The Internet provides a ready source of information on a wide range of topics of interest to those affected by cancer," Dr. Moynihan says. "The difficulty is trying to decide which sites provide reputable information and which information is relevant to each individual patient. The long history and tradition of excellence associated with Mayo Clinic assures you that information provided will be reliable, up-to-date and comprehensive."
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- see all in Treatments and drugs
Alternative medicine (2)
- High-dose vitamin C: Can it kill cancer cells?
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- Goji juice: Can it lower my cancer risk?
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Question
High-dose vitamin C: Can it kill cancer cells?
I have been reading about vitamin C as an alternative cancer treatment. What can you tell me about it?
Answer
from Timothy Moynihan, M.D.
The use of vitamin C in alternative cancer treatment isn't new. Proponents claim that large doses of vitamin C are toxic to cancer cells. However, there is no reliable evidence to support this theory.
Studies in the 1970s first suggested that large doses of supplemental vitamin C might be of some benefit in the treatment of cancer. But these studies were later found to have serious flaws. Subsequent well-designed, randomized, controlled trials of vitamin C and cancer found no such treatment benefit.
More recently, intravenous (IV) vitamin C has been touted to have different effects than does vitamin C taken orally. This has sparked renewed interest in the use of IV vitamin C as a cancer therapy. However, there is still no evidence that vitamin C has any effect on cancer. Until clinical trials are completed, it's premature to determine what role, if any, IV vitamin C may play in the treatment of cancer.
Next questionCurcumin: Can it slow cancer growth?
- Verrax J, et al. The controversial place of vitamin C in cancer treatment. Biochemical Pharmacology. 2008;76:1644.
- Hoffer LJ, et al. Phase I clinical trial of i.v. ascorbic acid in advanced malignancy. Annals of Oncology. 2008;19:1969.
- Heaney ML, et al. Vitamin C antagonizes the cytotoxic effects of antineoplastic drugs. Cancer Research. 2008;68:8031.
- Coulter ID, et al. Antioxidants vitamin C and vitamin E for the prevention and treatment of cancer. Journal of General Internal Medicine. 2006;21:735.
- Borst P. Mega-dose vitamin C as therapy for human cancer? Proceedings of the National Academy of Sciences. 2008;105:E95.
