Tamoxifen is considered a life-saver for many of those who survived breast cancer. The individuals who buy Tamoxifen know this drug represses the development of growth cells of the breast. Most types of tumor cells of the breast use estrogen, a female hormone, for reproduction. The estrogen actuates the estrogen receptor in these destructive cells. Patients who buy Tamoxifen by one means or another comprehend that by taking this specific medication, the nonstop development and improvement of tumor cells in their bosoms will be ended, as Tamoxifen competes with estrogen in binding with the receptor cells; henceforth, the development and advancement of the disease cells in the bosom is blocked.