Thousands of sisters are reaching out to help their siblings and other women by taking part in a long-term study to find the causes of cancer by studying the environment and genes of women whose sisters had breast cancer.

The Sister Study is seeking women in the U.S., including Puerto Rico, who are 35 to 74, with a blood sister who has or had breast cancer.

It's important that women from all races and ethnic groups and those over age 60 participate, according to the American Cancer Society, which is promoting the 10-year-long study.

Another key promoter is the Coalition of Labor Union Women. It is seeking to reach women working in trades and industry, which -- among NYSUT members -- would include many School-Related Professionals and hospital workers.

"This study will help all women in the battle against breast cancer," said NYSUT Vice President Kathleen Donahue.

With a goal of 50,000, more than 43,000 women have already enrolled in the Sister Study, a joint project of the U.S. Department of Health and Human Services and the National Institute of Environmental Health Sciences.

Researchers will compare study members who go on to develop breast cancer with those who do not to learn about possible environmental and genetic causes for the disease.

This project is one of the first long-term studies to examine the genetics of sisters and potential risk factors in their communities, workplaces and home.

Outside of non-melanoma skin cancer, breast cancer is the most common cancer among women, according to the American Cancer Society.

Anyone eligible and willing to join the Sister Study will be making a 10-year commitment.

The first weeks of involvement require a blood sample by a professional, who will also collect vital statistics as well as samples of urine, toenail clippings and household dust.

A Sister Study kit contains in-depth questionnaires, diet information and material to use when collecting samples. An annual health update will be required.

For details, see http://www.sisterstudy.org/ or call (877) 4SISTER (474-7837).

-- Liza Frenette