Efficacy of Sacituzumab Govitecan in Hormone Receptor–Positive/Human Epidermal Growth Factor Receptor 2–Negative Advanced Breast Cancer

Objectives: Breast cancer is the most diagnosed cancer in women, with hormone receptor-positive/human epidermal growth factor receptor 2-negative (HR+/HER2–) being the predominant subtype. Sacituzumab govitecan (SG), a novel antibody-drug conjugate, has emerged as a promising treatment for metastatic HR+/HER2– breast cancer. This systematic review and meta-analysis aimed to evaluate its efficacy and safety. Methods: Adhering to “Preferred Reporting Items for Systematic Reviews and Meta-Analyses” guidelines, a comprehensive search was conducted in PubMed, Scopus, and Cochrane databases up to December 2023. We included clinical trials and observational studies evaluating SG in patients with HR+/HER2– advanced breast cancer. The primary outcome was progression-free survival (PFS). In contrast, the secondary outcomes included overall survival, objective response rate, clinical benefit rate, duration of response (DOR), and adverse event profiles. Review Manager (Version 5.4) was used for the statistical analysis. Results: Nine studies met the inclusion criteria for systematic review; 2 were suitable for meta-analysis. The pooled analysis showed a hazard ratio of 0.53 (95% CI: 0.34-0.83; P = 0.005; I 2 = 86%) for PFSl and a hazard ratio of 0.63 (95% CI: 0.36-1.11; P = 0.11; I 2 = 92%) for overall survival. The pooled analysis of the duration of response showed significant results with a standard mean difference = 0.22 (95% CI: 0.03-0.42; P = 0.02; I 2 = 61%). Conclusion: SG demonstrates significant benefit in PFS and duration of response in patients of HR+/HER2– advanced breast cancer.