LONDON -- Contradicting U.S. findings, British scientists who conducted the longest-running study of tamoxifen have concluded there is not enough evidence the drug prevents breast cancer, according to research published Friday. Although scientists agree tamoxifen fights the recurrence of breast cancer in women who already have had surgery, they are divided over whether it prevents the disease from occurring in the first place.

...intelligent carriers and these nanoparticles are among them," said Dr. Gordon McVie, a professor at the European Institute of Oncology in Milan, Italy, who was not involved with the research. "This is a new system, and the more systems we have...

...the operation. The researchers behind the latest findings hope to change that. The researchers at the European Institute of Oncology in Milan split 701 women into two groups: one got mastectomies, the other got lumpectomies with radiation treatments...