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Pregnancy May Protect Against Bladder Cancer
A new study on mice has found that pregnancy may give some protection against bladder cancer.
The findings by investigators at the University of Rochester Medical Center showed that female mice that had never become pregnant had approximately 15 times as much cancer in their bladders as their counterparts that had become pregnant.
The researchers led by Jay Reeder, Ph.D., are focusing on a fact that has puzzled doctors and scientists for decades - Why does bladder cancer affect about three times as many men as women?
Scientists long blamed men's historically higher rates of smoking and greater exposure to dangers in the workplace, but the gap has persisted even as women swelled the workforce and took up smoking in greater numbers.
"While
some
researchers
have
asked
why
men
are
more
vulnerable
to
bladder
cancer,
perhaps
we
should
be
asking
why
women
have
more
protection," said
Reeder,
a
research
assistant
professor
in
the
departments
of
Pathology
and
Laboratory
Medicine,
Urology,
and
Imaging
Sciences.
"When it comes to bladder cancer, being female is a very good thing."
First author Aimee Johnson was investigating ways in which hormones might make males more vulnerable to bladder cancer. She was comparing rates of bladder cancer in male and female mice when she took a closer look at the females and found an unexpected, marked difference in cancer rates and volumes among the female mice.
Female mice that had gotten pregnant repeatedly had far fewer bladder cancers than both their normal male counterparts and their female counterparts that had never gotten pregnant. On average, the total tumor volume was about 15 times greater in female mice that had never gotten pregnant compared to mice that had gotten pregnant.
"We were shocked at the differences between the two groups. These mice were specially susceptible to bladder cancer, yet we saw virtually no cancer in the females that had become pregnant," said Reeder.
"The mice that were pregnant nursed their offspring, and a protective effect could be related to pregnancy, lactation, or both. Additional studies are needed to identify the specific mechanism," he added.
While scientists do know that early onset of menopause increases a woman's risk of getting bladder cancer, pregnancy hasn't generally been considered a possible factor in determining one's risk for bladder cancer, said Reeder.
Reeder's team used a sophisticated imaging instrument known as a cone-beam CT scanner to take some of the most detailed images ever of a developing cancer in mice with the disease. Cancers of the bladder grow into the hollow space from the lining of the bladder, somewhat resembling tiny heads of sprouting broccoli.
The imaging was done thanks to a collaboration with scientists at Koning Inc., a Rochester-based start-up company based on technology developed by Ruola Ning, Ph.D. Koning scientist David Conover worked closely with Reeder's team to customize the technology to evaluate bladder cancer as it develops.
The results highlight a possible role for hormones in bladder cancer, perhaps like the known role hormones have in the development of breast cancer. Most hormone research in bladder cancer has focused on male hormones such as testosterone and their capability of boosting the cancer process.
The study appears online as a rapid communication in the journal Urology.
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