Key clinical point: In the real-world setting, adding pertuzumab to trastuzumab+chemotherapy improved overall survival (OS) in a large cohort of patients with metastatic breast cancer (BC).
Major finding: Median OS was higher with pertuzumab+trastuzumab+chemotherapy (40.2 months; 95% CI 35.6-47.8 months) vs. trastuzumab+chemotherapy (25.3 months; 95% CI 22.8-27.6 months), with pertuzumab associated with significantly reduced mortality (hazard ratio 0.66; 95% CI 0.57-0.79). The 1-year cumulative incidence of a direct hospital visit was lower in the pertuzumab+trastuzumab+chemotherapy vs. trastuzumab+chemotherapy group ( P < .001).
Study details: Findings are from a population-based retrospective study including 1,158 patients with metastatic BC who received first-line treatment with pertuzumab+trastuzumab+chemotherapy (n = 579) or trastuzumab+chemotherapy (n = 579).
Disclosures: This study was supported by the Canadian Institutes of Health Research. Dr. Liu declared being an employee of ICES, which is funded by the Ontario Ministry of Health and Long-Term Care.
Source: Dai WF et al. Comparative effectiveness and safety of pertuzumab and trastuzumab plus chemotherapy vs trastuzumab plus chemotherapy for treatment of metastatic breast cancer. JAMA Netw Open. 2022;5(2):e2145460 (Feb 28). Doi: 10.1001/jamanetworkopen.2021.45460