tamoxifen

Tamoxifen saves the lives of people treated with breast cancer, but it also is associated with a greater risk of coming down with a deadlier form of the disease, a study says.

HOUSTON (MedPage Today) -- When tamoxifen is used as a chemoprevention agent, it may hasten the diagnosis of estrogen receptor-negative tumors while blocking development of ER-positive lesions, according to a new analysis of a landmark trial.