Document Type : Original Article(s)

Authors

1 Medical Oncology Department, Faculty of Medicine, Zagazig University, Egypt

2 Clinical Oncology and Nuclear Medicine Department, Faculty of Medicine, Zagazig University, Egypt

10.30476/mejc.2024.102264.2080

Abstract

Background: This study aimed to assess the effect of proton pump inhibitors (PPIs) on hormone receptor-positive (HR+) and her-2-negative (her2-) metastatic breast cancer (MBC) in patients receiving CDK4/6i.
Method: In a retrospective study, patients were divided into two groups based on their use of PPIs: concomitant use for at least half the treatment period (C-PPIs) and non-concomitant use for less than half the treatment period (NC-PPIs). Statistical analyses were conducted using SPSS 22.0 and MedCalc Software bvba 13.
Results: Out of 217 patients, 114 (52.5%) received palbociclib and 103 (47.5%) received ribociclib. Then, 71 palbociclib recipients were combined with aromatase inhibitors (AIs) (43 C-PPIs and 28 NC-PPIs), while 43 were combined with fulvastrant (25 C-PPIs and 18 NC-PPIs). For ribociclib, 82 patients were combined with AIs (71 C-PPIs and 11 NC-PPIs) and 21 were combined with fulvastrant (10 C-PPIs and 11 NC-PPIs). Patients with C-PPI had lower progression-free survival (PFS) than those without C-PPI, palbociclib recipients with AIs or fulvastrant (8.97 months vs. 19.02 months, P < 0.001; 13.72 months vs. 18.52 months, P = 0.04, respectively) and ribociclib recipients with AIs (10.7 months vs. 19.7 months, P = 0.05), but not in patients who received ribociclib with fulvastrant (P = 0.52).
Conclusion: The simultaneous use of PPIs with palbociclib or ribociclib may be associated with a shorter PFS in HR+, HER2- MBC patients. These results have the potential to enhance clinical decision-making by identifying possible drug interactions and optimizing treatment plans.

Highlights

Amrallah Mohammed (PubMed)

Keywords

Main Subjects

This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination, and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.30476/mejc.2024.102264.2080

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