Printer Friendly

Smoking, breast cancer: jury still out.

Smoking, breast cancer: Jury still out

A growing body of evidence indicates that women who smoke cigarettes have lower estrogen levels than those who don't--a hormonal reduction that would appear to help protect premenopausal women against estrogen-dependent breast cancers. Researchers have also noted that women smokers typically begin menopause about one year earlier than non-smokers, and other studies have linked earlier onset of menopause with a reduced risk of breast cancer, says CDC epidemiologist Nancy E. Stroup. But new research showing a slight increase in breast cancer risk among cigarette smokers sheds doubt on smoking's "protective effect."

In the retrospective study, Stroup and her colleagues collected data on 4,720 women diagnosed with breast cancer between the ages of 20 and 54, and compared them with 4,682 controls in the same age range who had no history of breast cancer. The data, described in the February AMERICAN JOURNAL OF EPIDEMIOLOGY, show that the women who reported having smoked more than 100 cigarettes in their lives faced a breast cancer risk 1.2 times that of those who never smoked. The risk of breast cancer did not consistently increase with the number of cigarettes a women smoked each day or the number of years she smoked. Stroup speculates that cigarette smoking has unidentified effects that enhance breast cancer risk, counter-balancing the beneficial effect of lowered estrogen.
COPYRIGHT 1990 Science Service, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1990, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:smoking protects against breast cancer
Publication:Science News
Date:Feb 10, 1990
Words:226
Previous Article:Caffeine, conception: no correlation.
Next Article:Enzyme, cancer spread: link confirmed.
Topics:


Related Articles
Lung cancer: some decrease.
Social isolation: female cancer risk?
Panel steps up cancer war.
Diet and cancer: timing makes a difference.
Cigarettes tied to fatal breast cancer.
In developed and developing countries, breast cancer risk is reduced by 4% for each year of breastfeeding. (Digests).
Everything gives you cancer: but good lifestyle choices will help you fight it off.
Bright lights, big cancer: melatonin-depleted blood spurs tumor growth.
Polymorphisms modify breast cancer risk in smokers.

Terms of use | Copyright © 2016 Farlex, Inc. | Feedback | For webmasters