Key clinical point: Patients with advanced or metastatic breast cancer (BC) who received concomitant proton pump inhibitors (PPI) plus palbociclib experienced less favorable survival outcomes compared with those who received palbociclib only.
Major finding: Patients who received concomitant PPI + palbociclib vs only palbociclib had significantly shorter progression-free survival (hazard ratio [HR] 1.76; 95% CI 1.46-2.13) and overall survival (HR 2.72; 95% CI 2.07-3.53) rates.
Study details: This retrospective cohort study included 1310 patients with hormone receptor-positive and human epidermal growth factor receptor 2-negative advanced or metastatic BC, of which 344 and 966 patients received concomitant PPI + palbociclib and palbociclib only, respectively.
Disclosures: This study was funded by Sungkyunkwan University (South Korea), the Korean Ministry of Education, and the National Research Foundation of Korea. The authors declared no conflicts of interest.
Source: Lee J-E et al. Concomitant use of proton pump inhibitors and palbociclib among patients with breast cancer. JAMA Netw Open. 2023;6(7):e2324852 (Jul 21). doi: 10.1001/jamanetworkopen.2023.24852