Red
Meat Gene Linked with
Prostate Cancer in Study
Excerpt
By Christopher
Doering, Reuter's Health
WASHINGTON (Reuters) - A gene involved in digesting red meat
is also highly active in cells taken from prostate cancer tumors--a
finding that could lead to new dietary and chemical treatments
to prevent the disease, researchers said on Wednesday.
Cells removed from prostate tumors showed a nine-fold increase in
activity by a gene called AMACR as compared to healthy cells, a
team of researchers at Johns Hopkins University in Baltimore found.
The AMACR fatty acid molecule is found in high levels in dairy
and beef products. The gene of the same name produces an enzyme
that helps break down the fatty acid.
Previous studies have shown that diets high in red meat are
linked with an increased risk of prostate cancer.
The researchers cautioned that it was too early to establish
a link between eating beef and dairy products and prostate cancer,
but said the findings offer a way for scientists to study the
association.
"For years, many of us have believed that diet is somehow linked
to prostate cancer, but we didn't have any molecular clues as
to how this works," Dr. Angelo De Marzo, a cancer and urology
specialist who co-authored the study with colleague William Isaacs,
said in a telephone interview.
"This opens the question, is this gene (activated) because it
is helping to drive prostate cancer growth?" he asked.
Writing in the journal Cancer Research, De Marzo and his colleagues
said they studied more than 6,500 genes and found the AMACR gene
active at unusually high levels in prostate cancer.
They later studied 168 prostate cancer tumors and found that
95% had high levels of activity by the gene, making it one of
the main biological markers of the cancer.
De Marzo and Isaacs said the AMACR markers might be used to
diagnose prostate cancer and reduce the number of needle biopsies
that patients currently have to undergo.
A prostate biopsy involves inserting a needle via the rectum
to get to the prostate. De Marzo estimated that as many as 15%
of the procedures must be repeated.
It might also be possible to use scans to look for AMACR gene
activity.
"It is a beautiful marker regardless of what role it is playing
in the disease," said Isaacs.
Prostate cancer is the second most common cancer found in men,
after lung cancer. The American Cancer Society estimates that
189,000 men will be diagnosed with prostate cancer in 2002 and
30,000 will die of it.
Reference Source 89
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