Breast-cancer cells that express estrogen receptor can be treated with tamoxifen only as long as they remain sensitive to the drug, says a U.S. study.

There are no long-term, adequately controlled studies that define whether leaving small polyps is safe, says a U.S. expert.

A University of Michigan Health System study suggests that a compound in green tea may provide therapeutic benefits to those with rheumatoid arthritis.

U.S. researchers identified antioxidant mechanisms essential for regenerative function that paves the way to preventing heart disease.

Resistance training was successful in getting 90 percent of workers with severe rotator cuff injuries back to work, found a U.S. study.