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• W4313402979 abstract "ABSTRACT Objectives Antiepileptic and antiarrhythmic drugs inhibit voltage-gated sodium (Na + ) channels (VGSCs), and preclinical studies show that these medications reduce tumour growth, invasion and metastasis. We investigated the association between VGSC inhibitor use and survival in breast, bowel and prostate cancer patients. Design Retrospective cohort study. Setting Individual electronic primary healthcare records extracted from the Clinical Practice Research Datalink (CPRD). Participants Records for 132,996 patients with a diagnosis of breast, bowel or prostate cancer. Primary and secondary outcome measures Adjusted Cox proportional hazards regression was used to analyse cancer-specific survival associated with exposure to VGSC inhibitors. Exposure to non-VGSC-inhibiting antiepileptic medication and other non-VGSC blockers were also considered. Drug exposure was treated as a time-varying covariate to account for immortal time bias. Results During 1,002,225 person-years of follow-up, there were 42,037 cancer-specific deaths. 53,724 (40.4%) cancer patients had at least one prescription for a VGSC inhibitor of interest. Increased risk of cancer-specific mortality was associated with exposure to this group of drugs (HR 1.59, 95% CI 1.56-1.63, p<0.001). This applied to VGSC-inhibiting tricyclic antidepressants (HR 1.61, 95% CI 1.50-1.65, p<0.001), local anaesthetics (HR 1.49, 95% CI 1.43-1.55, p<0.001) and anticonvulsants (HR 1.40, 95% CI 1.34-1.48, p<0.001), and persisted in sensitivity analyses. In contrast, exposure to VGSC-inhibiting Class 1c and 1d antiarrhythmics was associated with significantly improved cancer-specific survival (HR 0.75, 95% CI 0.64-0.88, p<0.001 and HR 0.54, 95% CI 0.33-0.88, p=0.01, respectively). Conclusions Association between VGSC inhibitor use and mortality in cancer patients varies according to indication. Exposure to VGSC-inhibiting antiarrhythmics, but not anticonvulsants, supports findings from preclinical data, with improved survival. However, additional confounding factors may underlie these associations, highlighting the need for further study. Strengths and limitations of this study Primary care research data with large sample size and statistical power. No direct information on metastasis as an outcome. Drug exposure data are based on prescriptions. Drug exposure is treated as a time-varying covariate to account for immortal time bias." @default.
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• W4313402979 date "2022-12-18" @default.
• W4313402979 modified "2023-10-11" @default.
• W4313402979 title "Sodium channel-inhibiting drugs and cancer-specific survival: a population-based study of electronic primary care data" @default.
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• W4313402979 doi "https://doi.org/10.1101/2022.12.16.22283520" @default.
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