This clinical trial is focused on studying a type of breast cancer known as metaplastic breast cancer, which is advanced and cannot be surgically removed. The study is specifically looking at cases where there are changes in certain genes, called PIK3CA and PTEN. These changes can affect how the cancer grows. The trial is testing a treatment using a medication called MEN1611, which is taken as a capsule, either by itself or in combination with another medication called eribulin, which is given as an injection.
The purpose of the study is to see how effective these treatments are for patients with this specific type of breast cancer. The study is divided into two groups. In one group, patients will receive MEN1611 alone, and in the other group, patients will receive MEN1611 together with eribulin. The study will monitor how the cancer responds to these treatments over a period of time.
Participants in the study will receive the treatment and be regularly monitored by healthcare professionals. The study will track the progress of the cancer and any changes in the patient’s condition. The goal is to determine if these treatments can help control the cancer and improve the patient’s quality of life. The study will also look at any side effects that may occur during the treatment period.



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