Randomized trial comparing neo-adjuvant versus adjuvant chemotherapy in operable locally advanced breast cancer (T4b N0-2 M0)

Abstract

Background and objectives: Locally advanced breast cancer (LABC) remains a major problem in developing countries. While trials utilizing neo-adjuvant chemotherapy demonstrate superior survival rates compared to historic controls, randomized studies evaluating the precise role of neo-adjuvant chemotherapy in LABC are lacking. In the present trial, neo-adjuvant chemotherapy was compared against adjuvant chemotherapy to assess survival advantage in operable T4b N0-2 M0 breast cancer.

Methods: A total of 101 women with operable LABC (T4b N0-2 M0) were randomized. In arm A, 50 patients received 3 cycles of CEF chemotherapy before and 3 cycles following surgery. In arm B, 51 patients had primary surgery followed by 6 cycles of CEF chemotherapy. In both arms, loco-regional radiotherapy was given after completion of CEF.

Results: The response of primary tumor to neo-adjuvant chemotherapy was 66%, complete response (CR) 14% and partial response (PR) 52%. Clinical nodal response occurred in 95% of node positive patients. Only two (4%) patients had pathologic CR both in tumor and axilla. There was a significant (P = 0.02) increase in incidence of pathologically negative nodes in arm A. At a median follow up of 25 months, there was no significant difference in overall and disease free survival (DFS) in both arms (P = 0.42 and 0.18). Patients showing a response to neo-adjuvant chemotherapy had better DFS (P = 0.04) compared to those who had no response.

Conclusions: Early results of the study indicate no survival benefit with the inclusion of neo-adjuvant chemotherapy in LABC (T4b N0-2 M0). Neo-adjuvant chemotherapy resulted in significant down staging; good responders had a better DFS compared to those who did not respond.