WebMD Medical News
Louise Chang, MD
Nov. 9, 2009 -- Two medications on the market to treat breast cancer and osteoporosis
worked well to eliminate cervical cancer in animal
studies, according to new research.
The two drugs also kept precancerous growths from becoming cancerous, says
researcher Sang-Hyuk Chung, PhD, a research associate at the McArdle Laboratory
for Cancer Research at the University of Wisconsin School of Medicine and
Public Health in Madison.
"If it's translatable to humans, then it may open up another treatment
possibility," Chung tells WebMD. His study is published in PNAS Early
But experts who reviewed the research for WebMD say it must be viewed as
preliminary. Chung agrees, saying, "It will take years to get results from
potential clinical trials."
An estimated 11,270 new cases of invasive cervical cancer are expected in
the U.S. this year, according to the American Cancer Society; about 4,070 women
will die from the disease. Cervical cancer treatment options include surgery,
chemotherapy, and radiation, depending on the stage at which it is
Chung and Paul F. Lambert, PhD, also at the University of Wisconsin, tested
the drugs on mice genetically engineered to carry human papillomavirus (HPV) 16, a strain that is
strongly associated with cervical cancer.
In the U.S., genital HPV is the most common sexually transmitted infection,
according to the CDC. New HPV vaccines can prevent some infections but can't
eliminate infections already present or precancerous growths. There are many
different HPV strains.
Although many women become infected with HPV, few develop cervical cancer,
as the virus often clears on its own. Since not all HPV-infected women get
cervical cancer, Chung and others have long suspected another factor is in
play. They decided to focus on estrogen, a hormone to which
the cervix and other female organs are responsive.
It's known that long-term use of birth control pills, as well as
multiple pregnancies, increase the risk of cervical cancer in HPV-infected
women, Chung writes.
In their mouse model, estrogen is required for cervical or vaginal cancer to
develop, according to Chung.
So Chung and Lambert gave the mice either Faslodex, used to treat certain
breast cancers, or Evista, used to treat
osteoporosis and to reduce the risk of breast cancer in some women. One group
of animals with cervical cancer was untreated.
The drugs prevent estrogen from working in the cervical cells, according to
After a month, the researchers looked at the results. Over 90% of those
treated with either Faslodex or Evista did not have cancer, Chung says. The
drugs also were effective in eliminating precancerous growths.
"At this point I cannot say whether one [drug] is better than the other," he
Chung says the drugs may one day provide another cervical cancer treatment
The real value of the research may prove to be showing experts a more
precise model of how cervical cancer develops, says Margaret Madeleine, PhD, an
assistant member of the Fred Hutchinson Cancer Research Center and research
assistant professor of epidemiology at the University of Washington School of
Public Health in Seattle, who reviewed the findings for WebMD.
''There may be more interest in it as a model of how cervical cancer might
develop in the presence of birth control pills or [multiple pregnancies], both
known risk factors [in HPV-positive women]," she says.
Ernest Han, MD, PhD, gynecologic oncologist and assistant professor at the
City of Hope Comprehensive Cancer Center in Duarte, Calif., calls the research
finding an interesting concept.
Overall, he says, ''our detection [of cervical cancer] is pretty good.''
Pap tests look for cervical cell changes caused by HPV so the cancer can
be detected early. However, "treatment for advanced cancer and for patients who
have recurrences is poor," he says.
The study, however, has limitations, Han says. It was small. It would be ''a
leap" to say this may soon be a treatment for cervical cancer. ''We'd
have to see more definitive studies."
SOURCES:Sang-Hyuk Chung, PhD, research associate, McArdle Laboratory for Cancer
Research, University of Wisconsin School of Medicine and Public Health,
Madison.Chung, S. PNAS Early Edition, Nov. 9, 2009.Ernest Han, MD, PhD, gynecologic oncologist and assistant professor, City of
Hope Comprehensive Cancer Center, Duarte, Calif.Margaret Madeleine, PhD, assistant member, Fred Hutchinson Cancer Research
Center; research assistant professor, University of Washington School of Public
Health, Seattle.CDC web site: "Genital HPV Infection- CDC Fact Sheet."American Cancer Society web site: "What Are the Key Statistics About
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