PURPOSE

To assess the overall survival (OS) of early human epidermal growth factor receptor 2 (HER2)-enriched breast cancer patients after receiving neoadjuvant trastuzumab (NAT) compared to adjuvant trastuzumab (AT) treatment and the difference in local-regional relapse (LRR) rate with this tumor and treatment between women after mastectomy and women after breast-conserving therapy (BCT).

METHODS

Articles were retrieved from PubMed, Embase, Web of Science, and Cochrane Library. A pooled odds ratio (OR) with a 95% confidential interval (CI) was calculated. The StataSE version 12.0 software was employed for meta-analysis.

RESULTS

Twelve available clinical studies containing 2366 subjects were included. The OS of NAT compared with that of AT was not significantly different (pooled OR=1.04; 95% CI, 0.47-2.33). There was a significantly lower LRR rate for patients with mastectomy compared to those with BCT (pooled OR=0.58; 95% CI, 0.38-0.89); however, subgroup analysis revealed that the significant advantage of LRR for mastectomy compared to BCT was only represented in women without trastuzumab treatment (pooled OR=0.52; 95% CI, 0.31-0.88) compared to those who received trastuzumab treatment (pooled OR=0.71; 95% CI, 0.34-1.49).

CONCLUSION

Early stage HER2-overexpression breast cancer patients benefit with an equivalent OS from NAT treatment compared to AT. Patients who underwent mastectomy and BCT experienced a similar LRR rate if they received anti-HER2 targeted therapy of trastuzumab, but the LRR rate was discernibly reduced in patients who received mastectomy compared to BCT if they did not also receive trastuzumab treatment.