@jo72 I looked back through your other posts and saw that you were considering a second opinion. Did you do that yet? With your questions and the stage of ovarian cancer getting another opinion is what I do. I'd go to a comprehensive cancer center whether there is ton of experience, ongoing research, and physicians who collaborate with one another. You mentioned Stanford as an option. You might also consider UC San Francisco. Your primary care provider could make the referral for you.

Did you have a biopsy or surgery prior to starting on chemotherapy? Your question about HER2 positive could be found on your pathology report. Any tissue that was examined or removed would go to a pathologist who is a medical doctor. It's the pathologist that will make the diagnosis.