Normal cells grow and die in a controlled way.
Cancer occurs when cells become abnormal and divide and grow without control or order. Tamoxifen has been used to treat both advanced and early stage breast cancer. It slows or stops the growth of cancer cells that are already present in the body, helps prevent the original breast cancer from returning and also helps prevent new cancers from developing in the opposite breast. Tamoxifen is also being studied to determine its usefulness in other types of cancer. As you read this keep in mind that each individual's experience will vary.