Background: Proton pump inhibitors (PPIs) negatively impact fluoropyrimidine-based chemotherapy efficacy in colorectal cancer. This study assessed PPI impact on major pathologic response (mPR) rates of pancreatic adenocarcinoma (PDAC) patients receiving fluoropyrimidine-based chemotherapy.
Methods: An institutional retrospective review of resected PDAC patients receiving neoadjuvant fluoropyrimidine-based chemotherapy (98% FOLFIRINOX) from 2011 to 2021 was conducted. Outcomes were stratified by use or nonuse of PPIs within 6 months of neoadjuvant chemotherapy initiation. Primary outcome was mPR defined as complete or near complete response.
Results: Among 540 patients included, the median age was 64 (IQR: 60-70) years, 297 (55%) were male, and 202 (37%) were PPI users. 170 (31%) patients had mPR with similar rates among PPI users and nonusers (29% vs. 33%, p = 0.38). No difference in mPR was seen between PPI users and nonusers receiving chemoradiation (35% vs. 36%, p = 0.89) or ≥8 cycles of NAC (33% vs. 36%, p = 0.55). Median OS for PPI users was 30.9 versus 31.7 months for nonusers (p = 0.62). On multivariable analysis, PPI therapy was not associated with decreased survival.
Conclusion: PPI usage did not significantly influence mPR or OS following neoadjuvant fluoropyrimidine-based chemotherapy in resected PDAC patients. Further analysis of all patients, not just those who underwent resection, is required.
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