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- W2166545910 abstract "Background: Myelotoxicity, a major toxicity of vinorelbine, may be related to the degree of one's exposure to vinorelbine. In theory, clarithromycin has the potential to alter vinorelbine's pharmacokinetics by inhibiting CYP3A and/or P-glycoprotein; this may result in massive exposure to vinorelbine and severe toxicity. To date, macrolide–vinorelbine drug interactions have not been reported. Objective: To estimate the clinical risk of a interaction between vinorelbine and clarithromycin. Methods: In a retrospective cohort study, we searched computerized medical records of patients who had been administered vinorelbine in the University of Fukui Hospital. The study cohort was defined as all patients with non–small-cell lung cancer who received vinorelbine between May 30, 2003, and January 31, 2008. The treatment courses were classified according to whether or not clarithromycin was concomitantly administered with vinorelbine. Nadir neutrophil counts were recorded as the major outcomes. Vinorelbine–clarithromycin interaction was defined as a significant increase in the risk of severe neutropenia when the 2 drugs were administered concomitantly. Results: A total of 12 (63.2%) and 11 (27.5%) episodes of grade 3/4 neutropenia occurred among the patients who were and were not administered clarithromycin, respectively. The incidence of grade 4 neutropenia was higher in the group administered clarithromycin than in those who did not receive it (31.6% vs 2.5%; p = 0.0033). Vinorelbine dose, concomitant clarithromycin administration, and female sex were significantly correlated with severe neutropenia, with unadjusted odds ratios of 0.07 (95% CI 0.01 to 0.59), 4.52 (95% CI 1.41 to 14.45), and 4.55 (95% CI 1.39 to 14.29), respectively. Conclusions: Compared with patients who are administered vinorelbine alone, patients who are administered clarithromycin during chemotherapy with vinorelbine are at a higher risk for severe neutropenia. Physicians should educate their patients about this interaction. If possible, clarithromycin administration should be avoided in patients who will undergo chemotherapy with vinorelbine in the near future. However, further prospective pharmacokinetic studies are required to confirm this interaction." @default.
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- W2166545910 date "2009-03-01" @default.
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- W2166545910 title "Evaluation of Potential Interaction Between Vinorelbine and Clarithromycin" @default.
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- W2166545910 doi "https://doi.org/10.1345/aph.1l432" @default.
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