Tumour gone after neo-adjuvant chemo?

[vonny]

My daughter Lorna has now finished 6 rounds of chemo along with Herceptin and Zometa, however she continues with the Herceptin and Zometa every 3 weeks. She went for scans on Wednesday and it appears that the tumour in her breast has disappeared completely!
Her oncologist rang this morning and wants her to go in next week for biopsies of the breast.
My question is if the biopsies show no cancer cells should she still have surgery to remove the tissue where the tumour was?? Lorna is Stage 4 with mets to her spine but I am now starting to question this diagnosis of Stage 4. The radiologist we saw this week said that if Lorna did not have a cancer in her breast she would not question the very subtle abnormality in her 5th vertebra!! In fact she said she had never seen anything so subtle! Think more questions need to be answered!
Yvonne xx