Herceptin used when node neg?

[Tara]

I am wondering if I should use herceptin? I was first dx w/ bc back in 1999 on my left breast. I was 25 years old. It was stage 2, er neg, no nodes involved. I did a lump., 4 rounds chemo(a/c), radiation. Now, 6 years later I have been dx'd once again-this time to my right side. This cancer is slightly different. I am ER neg, stage 2, no nodes involved, but I am Her2 positive this time. I had a bil. mast. 3 weeks ago. I go in tomorrow for a heart ultrasound. This is the issue-my oncologist is concerned about heart failure. He wants me to do 4 rounds of chemo again (a/c). He is not sure about the herceptin as he is not sure about any studies out there that show it being effective for node negative women. He feels like the risk of heart failure may not be worth the benefit as I have no node involvement. He is going to research this some more before finalizing a treatment plan for me. Has anyone been given herceptin in a case similar to mine w/ no nodes involved? I am so confused. I know this is an aggresive type of cancer. I don't want it spreading to my bones or lungs-but I also don't want heart failure. Any advice would be greatly appreciated. Thanks