Key clinical point: Coadministration of proton pump inhibitors (PPI) may decrease the effectiveness of capecitabine monotherapy and worsen survival outcomes in patients with stage II-III colorectal cancer (CRC); however, this negative impact may be counteracted with capecitabine plus oxaliplatin (CapeOX).
Major finding: The concomitant use vs nonuse of PPI with capecitabine monotherapy led to shorter relapse-free survival (RFS; adjusted hazard ratio [aHR] 2.48; P = .013) and overall survival (OS; aHR 2.58; P = .052). However, use vs nonuse of PPI with CapeOX had no significant effect on RFS (aHR 0.82; P = .658) or OS (aHR 0.73; P = .621).
Study details: This was a retrospective study including 606 patients aged ≥20 years with stage II-III CRC, of which 54 patients received PPI with ≥1 dose of capecitabine monotherapy (n = 29) or CapeOX (n = 25).
Disclosures: The study was supported by the Keio Gijuku Fukuzawa Memorial Fund for the Advancement of Education and Research in Japan. R Uozumi declared receiving personal fees from a few sources. The other authors declared no conflicts of interest.
Source: Kitazume Y et al. Proton pump inhibitors affect capecitabine efficacy in patients with stage II–III colorectal cancer: A multicenter retrospective study. Sci Rep. 2022;12:6561 (Apr 21). Doi: 10.1038/s41598-022-10008-2