Node biopsy. What should I ask?

[michka]

Since I stopped TDM1 a year ago I have MRIs every 3 months. In January a strange node lit up near a kidney and it also lit up on the Pet/Scan I did right after. Nothing else lit up. After taking antibiotics it is still there and although it is unchanged beginning of March, the radiologist and the onc would like a CT guided biopsy. They say it has a strange shape for a breast metastasis but cannot say it is not one and the node was not visible before. (bloodwork normal including liver counts and markers).
I am afraid of the procedure because I had a lot of problems already and do not trust anybody anymore when they tell me there is no risk. But...I am really hesitating. Is it dangerous? Is there a risk of dissemination if it is cancer? Should I wait and just watch with MRIs? I would like to be sure I will get all the possible information from the biopsy.
What would you ask for apart from HER2, ER,PR?
DNA Analysis? They don't do that easily in France. Where could I send my slides in the US?
I did not sleep the entire night trying to list what I should ask.