Have we seen this?
I don't agree with the "more harm than good" comment, though, as I
rather be alive than not. Also interesting about the metabolism. Might
explain my 20 pound wt gain, although I chalk that up to my chemo brain
telling me "Have some chocolate, you deserver it."
Marilyn
http://news.yahoo.com/s/afp/20061129...cancerresearch
WASHINGTON (AFP) - Common drugs used to treat cancer patients may do
more harm than good by killing healthy brain cells, a research study
shows.
The study, which further indicated that chemotherapy can cause long-term
brain damage, gives scientists clues to the causes of "chemo brain", a
side effect many cancer patients complain of while under treatment, a
summary of the research said.
Mark Noble, a specialist in neural stem cell biology at the University
of Rochester, New York, led a research team which tested healthy brain
cells with normal clinical doses of chemotherapy drugs carmustine,
cisplatin and cytosine arabinoside.
The drugs are often used to treat people suffering certain breast
cancers, lung cancer, colon cancer, leukemia, brain tumors and some
lymphomas.
The study found that the drugs were more toxic to neural cells than to
the cancer cells they targeted. The drugs killed 70-100 percent of brain
cells, while only 40-80 percent of the cancer cells were killed.
Tested on animal neural cells, the cells kept dying for six weeks after
the treatment was administered, the study found.
The scientists were not surprised that all-important dividing stem cells
were killed by the drugs, but noted the danger that "the loss of
dividing cells has onerous consequences as these populations are
responsible for replenishing the other cell types in the central nervous
system."
The study, published Wednesday in the Journal of Biology, gave
scientists some insight into the causes of "chemo brain": complaints by
some four out of five chemotherapy patients of neurological side effects
such as loss of memory, loss of vision, seizures and sometimes dementia.
"This is the first study that puts chemo brain on a sound scientific
footing, in terms of neurobiology and cellular biology," Noble said in a
statement.
A study released in October by the University of California at Los
Angeles medical school showed that chemotherapy can provoke changes in a
person's metabolism and blood flow in the brain for at least 10 years
after the treatment has ended.