@coco46 ~ Hello! Yes, a biopsy was performed, also a liquid biopsy was done, blood testing, CT, etc. If theres a test or procedure, I've done it. Nothing pops up on a PET scan as well. I'm having another PET scan on Monday, but I don't really expect any new news. My Oncologist says about 10% of cancers are of unknown primary, and we may never know. Which in my opinion is the worst! I can't find any trials, support groups or anyone that has unknown primary, and the prognosis is terrible. I'm having a second opinion with UCSF in a week or so. I guess we'll see... Thank you for the reply and information, I appreciate it. (Sorry for the rant!)
P.S. what is IHC testing? 🤔