UnitedHealthCare and Herceptin

I am scheduled to start Herceptin on Aug. 29th, every three weeks for one year. My onc doesn't feel that my insurance is going to pay, but not positive. I was diagnosed 8/04 (stage III, tumor 8 cm, 1 positive node of 9, er/pr negative and her2 positive, 3+) I had 12 weeks of chemo, lumpectomy, re-excision, mastectectomy, another 12 weeks of chemo, TRAM Flap reconstruction 6/9/05 and will finish radiation this coming week. My insurance is with UnitedHealthCare (PPO). I would appreciate any feedback from anyone with UnitedHealthCare who is receiving Herceptin and is not stage IV, or anyone with UnitedHealthCare who's been denied.

Thanks,
Stacy