1.   Anastrazole blocks a vital enzyme in estrogen production, while tamoxifen prevents estrogen from binding to breast cells.

2.   A pregnancy carried to term changes breast cells in a way that helps block abnormal growth later.

3.   Abdominal fat raises insulin levels in the blood and, at least in laboratory studies, insulin promotes the growth of breast cancer cells.

4.   But it makes all her breast cells much more vulnerable to further damage that may disable their genetic controls completely.

5.   Dr. Weber said that if the protein is misplaced in breast cancer cells, it might be possible to discover how to move it back where it belongs.

6.   Dr. Bruce Kessel, a reproductive endocrinologist at Beth Israel Deaconess Medical Center, has test tube data showing ginseng may act like estrogen to stimulate breast cancer cells.

7.   Estrogen stimulates the breast cells to divide and proliferate, and with every additional cell division comes a chance for errors to creep into the genetic material.

8.   For the past several years, Liburdy has been researching the effects of electromagnetic fields on breast cancer cells and lymphocytes, Kolb said.

9.   In a series of experiments, the Boston researchers implanted human breast cancer cells in a strain of mice in which breast cancers grow easily.

10.   In test tube studies, breast cancer cells died after a few days in the blood plasma of three women who had cosmetic breast implants.