This clinical trial is focused on studying treatments for certain types of advanced cancers, specifically ER-positive HER2-negative advanced breast cancer and high-grade serous ovarian cancer. The study will explore the effects of a new medication called AZD8421, which is being tested both on its own and in combination with other cancer-fighting drugs. The main goal is to understand how safe and tolerable AZD8421 is for patients, and to determine the best dose to use in future studies.
Participants in the study will receive AZD8421 in the form of a film-coated tablet, taken orally. Some participants may also receive other medications, such as Palbociclib, Abemaciclib, Ribociclib, or Zoladex, which are also used to treat cancer. The study will monitor how the body processes these medications and will look for any side effects or changes in health. The study will also include a placebo group to compare the effects of the medications.
The trial will take place over a period of time, during which participants will have regular check-ups and tests to monitor their health and the effects of the treatment. These tests may include imaging scans like MRI or CT scans to assess the size and progression of tumors. The study aims to gather important information that could help improve treatment options for people with these types of cancer in the future.



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