This clinical trial is focused on studying a type of breast cancer known as metastatic breast cancer that is hormone receptor-positive (HR+) and does not express HER2. The study aims to explore the effectiveness of different treatment combinations for patients with specific genetic changes called PIK3CA mutations. These mutations are detected in the blood after patients have been treated with a type of medication called a CDK4/6 inhibitor, which is used in combination with another drug called fulvestrant.
The trial will compare two treatment combinations: one using alpelisib with fulvestrant, and the other using ribociclib with fulvestrant. Alpelisib is a medication that targets a specific protein involved in cancer cell growth, while ribociclib is another type of CDK4/6 inhibitor. Fulvestrant is a drug that blocks the effects of estrogen, a hormone that can promote the growth of breast cancer cells. The purpose of the study is to determine which combination is more effective in delaying the progression of the disease.
Participants in the study will receive one of these treatment combinations and will be monitored over time to assess how well the treatment is working. The study will also look at the overall survival of participants and any side effects they may experience. This research is important for understanding how to best treat patients with this type of breast cancer and specific genetic mutations.



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