If you are not aware of this site
www.breastcancertrials.org , I suggest take a look.
This site searches clinicaltrials.gov and matches trials based on your disease status, pathology (ER, PR, HER2, PI3K, PDL1, etc), treatment history, and prefer locations. You can either “Browse” or “Match to trials”. In “Match to trials” after selecting your disease status, click on “Match to Trials” again. I suggest click on “Save & Finish Later” (appears at about bottom of the page) after filling out a bit of info for each page. The first time clicking on “save & finish later” activates account creation, requiring you to create user name and password.
Best wishes.