This study is for people with a type of breast cancer called HR-positive, HER2-negative, which is advanced or has spread. HR means hormone receptors, and HER2 is a protein. The study will look at a new medicine called RGT-419B, given alone or with hormone therapy. The study checks if this medicine is safe and how it works in the body. It is for adults who have tried other treatments that did not work.
Key Points:
- The study involves taking the medicine by mouth.
- Participants must be 18 or older and able to sign a consent form.
- People with certain health issues or who are pregnant cannot join.
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