Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier
WebMD

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine
WebMD

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion
    WebMD

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community
    WebMD

    Community

    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Birth Control Health Center

Font Size
A
A
A

U.N. Agency Links the Pill, Hormones to Cancer

Overall Risk Unclear as the Pill Also Lowers Risk of Some Cancers
By
WebMD Health News

July 29, 2005 -- Researchers from a U.N. cancer agency are calling combined estrogen-progestin birth control pills and menopausal hormone replacement "carcinogenic to humans."

However, they don't dismiss either type of drug. For instance, they state that birth control pills may "slightly" raise the risk of some cancers while lowering risks of other cancers.

Women should weigh the drugs' risks and benefits with their doctors, write the researchers.

The report appears in The Lancet Oncology. The researchers included Vincent Cogliano, PhD, of the World Health Organization's International Agency for Research on Cancer (IARC).

They didn't do any new studies. Instead, they reviewed past research on the topic.

The risks are not new and are already noted on drug labels, says Candace Steele, director of global public relations for Wyeth Pharmaceuticals, which makes birth control pills and menopausal hormone therapy drugs.

Review of Birth Control Pill Studies

The researchers write that combined estrogen-progestin birth control pills may "slightly" raise breast cancer risk in women currently or recently taking those pills. But the risk seems to drop back to normal 10 years after stopping the pill, write the researchers.

The researchers note higher risks of cervical and liver cancers with combined birth control pills.

However, uterine and ovarian cancer risk is lower in women using birth control pills, they write.

Despite the slightly higher risk of some cancers, the overall risk of cancer from the pill is still low.

The IARC's assessment of cancer risk from birth control pills hasn't changed but now includes more types of cancer, write the researchers.

Net Benefit?

Because use of the pill (forms containing both estrogen and progestin) heightens risk of some cancers and reduces that of others, it is possible that there may be an overall net benefit to public health, write the researchers. More rigorous analysis is needed to show this, they add.

The researchers cite studies showing higher breast cancer risks for women using combined hormone therapy -- containing both estrogen and progestin. They note other studies showing that uterine cancer risk is higher in women taking estrogen-only therapy, compared to those taking estrogen and progestin.

Today on WebMD

IUD
Here's what to expect.
man opening condom wrapper
Do you know the right way to use them?
 
birth control pills
Here's what to do next.
doctor and patient
His and her options.
 
Concerned teenage girl
Slideshow
hospital gown
Quiz
 
Birth Control Pills Weight Gain
Article
pregnancy test and calendar
Article
 
contraceptive pills
Slideshow
Young couple looking at each other, serious
Article
 
woman reading pregnancy test result
Article
calendar
Article