Is the End of Chemotherapy Near?
For decades, chemotherapy has been
the number one tool the medical system used to combat the spread of
cancer cells from within.
The strategy to combat tumors has
been quite straightforward, mainly remove the tumor in any way possible.
Standard treatments are a combination of surgery to remove the tumors
physically, and the use of chemotherapy to dissolve the tumors from
within, to shrink them to nothing. Radiation is used to kill cells that
are dividing abnormally (which may later turn into tumors).
And there's no arguing the point that
this is, to a significant extent, working. Deaths from cancer have
dropped about twenty percent in the U.S alone over the last 20 years.
But, effective or not, these are
harsh treatments, that are just as brutal to the patient as to the
tumor. Surgeries are dangerous, chemotherapy is almost like slow poison,
leaving the patient feeling sick and losing weight, not to mention
hair.
That is why many researchers and
doctors are excited after a pair of studies were published by the New
England Journal of Medicine in June that announced a new type of
anti-cancer drug, which works in a completely different way from
chemotherapy. This drug helped leukemia patients go up from an average
of 50% survival rate to 83% after being treated for two years. Other studies are exploring similar biological solutions to other cancer types.
Some, like Dr. Tallman, chief of the
Leukemia department at the Memorial Sloan-Kettering Cancer Center, think
that we are indeed. "I think we are moving farther away from
chemotherapy and toward therapy that targets cells on a molecular
level."
Think of it as the difference between
carpet bombing an entire city and using a smart bomb to target
individual houses - the difference is huge, and the benefit to the
patient is just as big.
"We're starting to have a more
precise understanding of cancer, and so the trend is moving towards
using the right drugs with the right timing and tailoring them to the
right patients." Says Dr. Demetri, vice president of experimental
therapeutics at the Dana-farber Cancer Institute.
Already, says Dr. Demetri, patients
suffering from a Gastrointestinal Stromal Tumor (GIST) should not need
chemotherapy, as well as some types of lung cancer and melanoma
patients.
A study which was recently published
showed higher survival rates for patients with acute promyelocytic
leukemia (a cancer of the marrow bone) who did not use any type of
chemotherapy, only drug therapy.
There are, however, drawbacks to this
system, cancer cells are tricky, and may find a way to mutate past
these drugs. However, says Dr. Tallman, the field is advancing so
quickly that we're easily staying ahead of the game between cancer cells
and new drugs.
And another advantage to this system
is that instead of using one strategy to attack a tumor, which may be
comprised of several kinds of cells, doctors can now use several kinds
of drugs, each attacking another part of the tumor, and thus fight it on
many fronts, with a higher chance of reducing all of it.
And so combinations of drugs, like
with HIV, may become the new standard of fighting cancer, allowing the
patients undergo more tolerable treatments, less side effects, and more
healthy years ahead of them!
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Labels: anti-cancer, cancer, chemotherapy, drug, Fight, Gastrointestinal Stromal Tumour (GIST), Leukemia, Melanoma, promyelocytic leukemia
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