I'm in the same situation you are, I'm staged 4B epithelial OVCA with mets. to the lymph nodes, and i'm also BRCA2 positive.
I've done debulking surgery, carbo/taxol, Topotecan and now I'm on Gemzar. The only remission I've had was 4 months after carbo/taxol.
What chemo drugs have you already had, and why did your oncologist suggest you do one of the trials now?
I hope you get lots of responses, it will help all of us in this unfortunate situation.
I have reading that PARP inhibitor drug olarparib research is very promising, see the link http://news.bbc.co.uk/2/hi/health/8116790.stm. Also you may check member profile Burrows, who have been in this treatment for 2 years
My best whishes