This clinical trial is focused on studying a type of breast cancer known as hormone receptor positive (HR+), HER2-negative breast cancer. This type of cancer can return or spread to other parts of the body, which is referred to as recurrent or metastatic breast cancer. The study is testing a new treatment approach that combines a medication called Alisertib with hormone therapy. Hormone therapy is a treatment that blocks or lowers the amount of hormones in the body to slow down or stop the growth of cancer.
The purpose of the study is to find the best dose of Alisertib when used with hormone therapy, ensuring it is both safe and effective for future use. The study will involve several medications, including Letrozole, Tamoxifen, Anastrozole, Exemestane, and Fulvestrant. These medications are commonly used in hormone therapy to treat breast cancer. Participants in the study will receive one of these medications along with Alisertib or a placebo. The study will last for a period of 28 days, during which the effects of the treatment will be closely monitored.
Throughout the study, participants will be observed for any side effects or changes in their condition. The study aims to gather information on how well the combination of Alisertib and hormone therapy works in controlling the cancer and improving the participants’ health. This information will help determine the potential of this treatment combination for future use in patients with HR+, HER2-negative breast cancer.



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