vitamin C – Oral Cancer News

Antioxidants May Cause More Harm Than Good in Cancer Patients

Source: medscape.comAuthor: Zosia Chustecka While alternative health gurus often encourage increasing antioxidants in the diet and the taking of antioxidant nutritional supplements such as beta-carotene, vitamins A, C, and E, and selenium, new research findings suggest that antioxidants could do more harm than good, especially in cancer patients. The idea is discussed in a perspective article on the promise and perils of antioxidants for cancer patients in the July 10 issue of the New England Journal of Medicine. Coauthor David Tuveson, MD, PhD, professor and deputy director of the Cold Spring Harbor Laboratory Cancer Center in New York, explained in an interview with Medscape Medical News that the idea that antioxidants could be useful in cancer goes back to Linus Pauling, and is based on observations that oxidation within cells is needed for cell growth. "As cancer cells growth rapidly, a cancer cell would have more oxidation within it than a normal cell," he added, and the hope was that antioxidants would interfere with these cellular oxidative processes and would suppress the growth. "Although some early preclinical studies supported this concept," the authors write, there have now been several clinical trials that have shown no effect of antioxidants on reducing the incidence of cancer, and there have even been suggestions of harm in persons who are at risk for cancer. Dr. Tuveson noted a clinical trial from Scandinavia in the early 1990s, which found that high doses of antioxidants, particularly beta-carotene, were associated with more lung cancer rather than less as had been hoped for. There was [...]

Charlotte Parker2014-07-14T15:04:19-07:00July, 2014|Oral Cancer News|

Berry Nutrition

Source: www.foodproductdesign.com Author: Marie Spano, M.S., R.D., Contributing Editor Nutritionally speaking, good things come in sweet—and tart—little packages. Research is discovering berries pack a nutritional punch due to their vitamin, fiber and antioxidant content. Botanically speaking, berries are indehiscent fruits (they don’t need to be opened to release their seeds) that ripen through the ovary wall. However, any small, edible fruit with multiple seeds is typically considered a berry. In addition to lending flavor and brilliant colors to a wide variety of dishes, all berries are packed with an array of antioxidants, nutrients and potential health benefits. Berries that are especially antioxidant-rich include fresh crowberries, bilberries, black currants, wild strawberries, blackberries, blueberries, goji berries, sea buckthorn, blueberries and cranberries. However, the antioxidant content of berries varies based on the geographical growing condition. And, while fresh berries are an excellent source of antioxidants, total phenol content drops during processing. In fact, processed berry jams and syrup contain approximately half the antioxidant capacity of fresh berries, and juices show the greatest loss of anthocyanins and tannins due to the removal of seeds and skin (Nutrition Journal, 2010; 9:3; Journal of Agricultural and Food Chemistry, Jan 13, 2012). Botanical berries Shiny, scarlet-colored cranberries are rich in vitamin C, loaded with antioxidants, including flavonoids, and score higher in their ORAC score than many other fruits ("Oxygen Radical Absorbance Capacity (ORAC) of Selected Foods—2007", USDA ARS). Cranberries are perhaps best known for the role their juice plays in the prevention of urinary tract infections (UTI) [...]

Oral Cancer Foundation News Team - A2012-02-19T10:53:06-07:00February, 2012|Oral Cancer News|

Adapting the science of supplements and cancer prevention

Source: www.cancer.gov Author: Carmen Phillips Numerous studies suggest that avoiding excess weight, exercising regularly, and eating a diet heavy on fruits and vegetables decreases the risk of many diseases, including cancer. But as the expanding obesity epidemic has shown, there are major obstacles to getting broad swaths of people to adopt such a healthful lifestyle. So, for many years, cancer researchers have investigated whether specific nutrients—those that epidemiologic and animal model studies have suggested could sway cancer’s course—could decrease cancer risk. Much has been learned from this work, researchers in the field say, but, as is the case with treatment, each new discovery points to new areas of focus and other potential avenues of progress. With promising bioactive compounds in the pipeline, many prevention researchers are focused on figuring out not just whether something like sulforaphane, a natural compound found in broccoli and broccoli sprouts, can kill cancer cells in a test tube or animal model—which it does, quite well—but how, at the molecular level, it accomplishes this task, whether there are some cancer cells that are more likely to respond to it, and whether there are ways of discerning early on that the intervention is having its intended effect. Prevention: A Complex Matter A number of supplements have been tested in large prevention trials, including vitamins A, C, and E; selenium; beta-carotene; and folic acid. At least one trial has demonstrated a reduction in cancer deaths with a combination of supplements, while several others found no reduction or even [...]

Oral Cancer Foundation News Team - A2009-12-17T19:42:35-07:00December, 2009|Oral Cancer News|

Cancer patients turning to alternative remedies: become aware of dangers

Source: msnbc Author: Associated Press 60 percent seek natural ‘cures’ despite warnings from doctors TAMPA, Fla. - With much of her lower body consumed by cancer, Leslee Flasch finally faced the truth: The herbal supplements and special diet were not working. "I want this thing cut out from me. I want it out," she told her family. But it was too late. Her rectal cancer — potentially curable earlier on — had invaded bones, tissue, muscle, skin. The 53-year-old Florida woman could barely sit, and constantly bled and soiled herself. "It was terrible," one doctor said. "The pain must have been excruciating." Flasch had sought a natural cure. Instead, a deadly disease ran its natural course. And the herb peddlers who sold her hope in a bottle? "Whatever money she had left in life, they got most of it," said a sister, Sharon Flasch. "They prey on the sick public with the belief that this stuff can help them, whether they can or can't." Some people who try unproven remedies risk only money. But people with cancer can lose their only chance of beating the disease by skipping conventional treatment or by mixing in other therapies. Even harmless-sounding vitamins and "natural" supplements can interfere with cancer medicines or affect hormones that help cancer grow. Preying on insecurities Yet they are extremely popular with cancer patients, who crave control over their disease and want to do everything they can to be healthy — emotional needs that make them vulnerable to deceptive [...]

Charlotte Parker2009-06-16T12:13:51-07:00June, 2009|Oral Cancer News|

Vitamins C and E and Beta Carotene supplementation and cancer risk: A randomized controlled trial

Source: JNCI Journal of the National Cancer Institute, doi:10.1093 Authors: Jennifer Lin et al. Background: Observational studies suggested that a diet high in fruits and vegetables, both of which are rich with antioxidants, may prevent cancer development. However, findings from randomized trials of the association between antioxidant use and cancer risk have been mostly negative. Methods: From 8171 women who were randomly assigned in the Women's Antioxidant Cardiovascular Study, a double-blind, placebo-controlled 2 x 2 x 2 factorial trial of vitamin C (500 mg of ascorbic acid daily), natural-source vitamin E (600 IU of {alpha}-tocopherol every other day), and beta carotene (50 mg every other day), 7627 women who were free of cancer before random assignment were selected for this study. Diagnoses and deaths from cancer at a specific site were confirmed by use of hospital reports and the National Death Index. Cox proportional hazards regression models were used to assess hazard ratios (represented as relative risks [RRs]) of common cancers associated with use of antioxidants, either individually or in combination. Subgroup analyses were conducted to determine if duration of use modified the association of supplement use with cancer risk. All statistical tests were two-sided. Results: During an average 9.4 years of treatment, 624 women developed incident invasive cancer and 176 women died from cancer. There were no statistically significant effects of use of any antioxidant on total cancer incidence. Compared with the placebo group, the RRs were 1.11 (95% confidence interval [CI] = 0.95 to 1.30) in the vitamin [...]

Oral Cancer Foundation News Team - A2009-01-01T17:05:09-07:00January, 2009|Oral Cancer News|

Vitamin C may interfere with cancer treatment

Source: New York Times (nytimes.com) Author: Tara Parker-Pope Many people gobble big doses of vitamin C in hopes of boosting their immune system and warding off illness. But new research shows that in people with cancer, the vitamin may do more harm than good. Researchers at Memorial Sloan-Kettering Cancer Center in New York studied the effects of vitamin C on cancer cells. As it turns out, the vitamin seems to protect not just healthy cells, but cancer cells, too. The findings were published today in the journal Cancer Research. “The use of vitamin C supplements could have the potential to reduce the ability of patients to respond to therapy,” said Dr. Mark Heaney, an associate attending physician at the cancer center. Dr. Heaney and his colleagues tested five different chemotherapy drugs on cancer cells in the laboratory. Some of the cells were first treated with vitamin C. In every case, including a test of the powerful new cancer drug Gleevec, chemotherapy did not work as well if cells had been exposed to vitamin C. The chemotherapy agents killed 30 to 70 percent fewer cancer cells when the cells were treated with the vitamin. A second set of experiments implanted cancer cells in mice. They found that the tumors grew more rapidly in mice that were given cancer cells pretreated with vitamin C. The researchers found that just like healthy cells, cancer cells also benefit from vitamin C. The vitamin appeared to repair a cancer cell’s damaged mitochondria, the energy center [...]

Oral Cancer Foundation News Team - A2008-10-01T07:50:57-07:00October, 2008|Oral Cancer News|