I have been diagnosed with LCIS and have been on Tamoxifen for approximately 1 month. When my doctor told me the diagnosis he indicated I should expect to have more biopsies in the future. I know all the studies that have been done and Tamoxifen is supposed to greatly reduce my chances of developing an invasive cancer. If this is the case, why did my doctor make such a statement regarding future biopsies? What is the likelihood of developing something contralaterally?