Neoadjuvant Therapy in Breast Cancer: Can We Define Its Role?

Abstract

It remains unclear whether neoadjuvant therapy increases disease-free survival when compared with an approach in which chemotherapy is delayed until after surgery. However, the current rationale for neoadjuvant therapy is based on its usefulness in quickly evaluating the likely benefit of new approaches to treatment and tailoring therapy to the biological characteristics of the individual tumor. In the primary therapy of breast cancer, the Aberdeen study shows that patients unresponsive to an anthracycline-based neoadjuvant regimen may achieve a response when switched to docetaxel. Further, patients with an initial clinical response to CVAP were more likely to show a pathological complete response (pCR) at final assessment when four cycles of CVAP were followed by four of docetaxel than when CVAP was maintained for eight cycles (pCR rate 34% versus 16%). Early data suggest that this difference translates into significantly lengthened progression-free survival. As in other disease settings, it may be possible to devise nonanthracycline-containing neoadjuvant regimens which are at least as effective as those in current use.