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The Clinical Trial
The (first) study comes from the Neuroscience Department
of the Regina Elena National Cancer Institute in Rome,
Italy. Its aim was to evaluate the nerve-protective
effect of antioxidant supplementation with vitamin E in
patients who were being treated with cisplatin
chemotherapy.
Between April 1999 and October 2000,
these patients were randomly assigned to receive either
cisplatin alone or cisplatin with vitamin E
supplementation. Alpha-tocopherol (300 milligrams per
day = approximately 300 International Units) was
administered orally before cisplatin chemotherapy and
then continued for three months after the suspension of
the treatment.
Twenty-seven patients completed six cycles of cisplatin
chemotherapy: 13 in the supplementation group and 14 in
the chemotherapy-alone group. The incidence of nerve
damage was 85.7 percent with cisplatin alone.
But this
fell to 30.7 percent when this single antioxidant was
added. This was a nearly two-thirds reduction and was,
of course, highly significant. The severity of the
nerve damage was also significantly lower in patients
who were supplemented with vitamin E.
Preclinical studies showed that when cisplatin was
combined with vitamin E, "no differences were observed
in tumor weight inhibition, tumor growth delay, or life
span as compared with treatment with cisplatin alone."
In other words "supplementation of patients receiving
cisplatin chemotherapy with vitamin E decreases the
incidence and severity of peripheral neurotoxicity,"
but does not interfere with the effectiveness of
treatment.
The finding is particularly significant because
cisplatin is an alkylating agent, the kind of
chemotherapy whose potency is said by some oncologists
to be diminished by concurrent antioxidant use.
That
is because such agents are thought to work by
generating "free radicals" in cancerous cells.
Antioxidants theoretically could interfere with that
activity. In reality, however, that does not appear
to happen.
The study was published in the Journal of Clinical
Oncology, the "Bible" of the cancer world. Hopefully,
it will have an impact on oncologists who have been
telling their patients never to take antioxidants
during chemotherapy, on the unproven premise that this
would undermine the effectiveness of toxic drugs.
www.cancerdecisions.com
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