HYDERABAAD - Indian cancer
researchers have taken a giant step on the road to discovering the ultimate
cancer cure by developing a drug that selectively targets the cancer cells
without harming the healthy ones.
Researchers in Kolkata claim that patients in "very
advanced stages" of cancer for whom all other treatments had failed
have been brought back to "excellent" health with the help of
a drug formulation they have developed after research spanning more than
a decade.
"We have what we think magic bullet against cancer,"
says Manju Ray, a biochemist at the Indian Association of the Cultivation
of Science (IACS) where the drug was developed under a project funded by
the Department of Science and Technology and the Council of Scientific
and Industrial Research.
Most currently available anti-cancer drugs are toxic because
they also damage the normal cells. Ray says the IACS formulation, containing
"Methylglyoxal" as the lead ingredient, combats only the diseased
cells, the cherished goal of cancer researchers worldwide. Methylglyoxal
is a metabolite in the human body produced during glucose breakdown.
Others involved in the project are Swapna Ghosh of IACS,
Manoj Kar and Subhankar Ray of the University College of Science, and Santajit
Datta, a medical practitioner. Results of human trial conducted by them
with the new drug have recently appeared in the Indian Journal of Physics.
While Americans are going ga-ga with their new anti-cancer
drug "Glivec" - that was featured on the cover of May 28 issue
of Time magazine - the low-profile, cash-strapped Kolkata researchers have
been working quietly for over a decade shuning publicity until they obtained
proof from human trials nine weeks ago.
According to their published paper, the Methylglyoxal-based
forumulation had "a dramatic positive effect on the patients".
For instance, the condition of 11 out of the 19 patients
treated - most of them in a very advanced stage when the treatment began
-- are now stated to be in "excellent physical condition". Five
are in stable condition and only three died during the course of the study.
Since the submission of the paper, the number of patients
treated has crossed 40 mark with more than 70 per cent success, according
to Manju Ray.
Most remarkable fact, according to the scientists was
that Methylglyoxal was successful against different types of cancer unlike
"Glivec" which targets only the chronic myeloid leukemia.
Those whose health returned to "excellent" condition
after treatment with Methylglyoxal included patients in "a very advanced
stages" of colon cancer, acute myeloid leukemia, non-Hodgkin's lymphoma,
and cancers of ovary, breast, liver, lung, bone, gall bladder, pancreas
and oral cavity.
The patients were inducted for the trial, from January
to June 2000, after obtaining permission from the Drug Controller General
of India, the scientists said. The drug was administered orally for about
six months with gradual reduction of daily dosage from the initial 25 milligrams
per kilogram of body weight.
Researchers said development of the drug was preceded
by years of basic research involving human cancer cells in culture and
animal experiments that showed that Methylglyoxal selectively killed the
cancer cells without affecting normal cells by exploiting "a very
significant" biochemical difference between the two.
Explaining the mechanism of action, the scientists said
cancer cells required a large amount of energy providing substance called
ATP (Adenosine-5-Triphosphate) for survival.
"Methylglyoxal inactivates the enzyme (Glyceraldehyde-3-
Phosphate Dehydrogenase) needed for ATP production in cancer cells and
thereby starves tem to death. Normal cells remain unaffected."
Manju ray said that chemists knew Methylglyoxal molecule
for about four decades and its anti-cancer effects in animals had also
been studied. "But surprisingly, no one bothered to initiate further
research leading to human trials," she said.
The researchers said concern in some quarters about safety
of Methylglyoxal were not borne out from the clinical trials, which showed
that in combination with protective agent like Ascorbic Acid and vitamins,
the drug Methylglyoxal had no major toxic effect. They said there was scope
for further enhancing the drug's efficacy.
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