Hi MiaMeme. there is a discussion on borderline tumors on this site. Just search under "borderline."
I had an atypical proliferating serous tumor, 10cm, removed last year. I had a full hysterectomy, BSO, etc., etc., but I'm 55 (and lucky -- these kinds of tumors generally happen to younger women -- in older women it's usually full blown cancer). I was staged 1C. Staging is NOT subjective, but can only be done if you have tissue samples taken from in and around the tumor.