This clinical trial is focused on studying treatments for metastatic breast cancer, which is a type of breast cancer that has spread to other parts of the body. The study involves two treatments: abemaciclib, also known by its code name LY2835219, and tamoxifen. Abemaciclib is a medication that helps to slow down the growth of cancer cells, while tamoxifen is used to block the effects of estrogen, a hormone that can promote the growth of breast cancer cells.
The purpose of the study is to evaluate the safety and effectiveness of using abemaciclib in combination with tamoxifen, or using abemaciclib alone, in women who have previously been treated for hormone receptor-positive and HER2-negative metastatic breast cancer. Hormone receptor-positive means that the cancer cells grow in response to hormones, and HER2-negative indicates that the cancer does not have high levels of the protein HER2, which can promote the growth of cancer cells.
Participants in the study will receive either the combination of abemaciclib and tamoxifen or abemaciclib alone. The study will monitor the participants over a period to assess how the cancer responds to the treatment and to observe any side effects. The goal is to determine how long the treatment can prevent the cancer from progressing and to measure the overall response to the treatment. The study aims to provide valuable information that could help improve treatment options for women with this type of breast cancer.



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