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Can an early phase clinical pharmacology study replace a thorough QT study? Experience with a novel H3-receptor antagonist/inverse agonist

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Abstract

Objective

The objective of the present study was to compare the effects of pitolisant on QTcF interval in a single ascending dose (SAD) study and a thorough QT (TQT) study.

Methods

The SAD study at three dose levels of pitolisant enrolled 24 males and the TQT study at two dose levels 25 males. Both studies intensively monitored ECGs and pitolisant exposure. Effect on QTcF interval was analysed by Intersection Union Test (IUT) and by exposure–response (ER) analysis. Results from the two studies were compared.

Results

In both studies, moxifloxacin effect established assay sensitivity. IUT analysis revealed comparable pitolisant-induced maximum mean (90 % confidence interval (CI)) placebo-corrected increase from baseline (ΔΔQTcF) in both the studies, being 13.3 (8.1; 18.5) ms at 200-mg and 9.9 (4.7; 15.1) ms at 240-mg doses in SAD study and 5.27 (2.35; 8.20) ms at 120-mg dose in TQT study. ER analysis revealed that ER slopes in SAD and TQT studies were comparable and significantly positive (0.031 vs 0.027 ms/ng/mL, respectively). At geometric mean concentrations, bootstrap predicted ΔΔQTcF (90 % CI) were 9.23 (4.68; 14.4) ms at 279 ng/mL (240-mg dose) in the SAD study and 4.97 (3.42; 8.19) ms at 156 ng/mL (120-mg dose) in the TQT study.

Conclusion

Pitolisant lacked an effect of regulatory concern on QTc interval in both the studies, however analysed, suggesting that the results from the SAD study could have mitigated the need for a TQT study. Our findings add to the growing evidence that intensive ECG monitoring in early phase clinical studies can replace a TQT study.

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Acknowledgments

The two studies were funded by BIOPROJET PHARMA, Paris (France). They were part of a dossier for regulatory submission for a marketing authorization. The ER modelling was performed by Mathieu Felices, Pharmacometrician, PhinC Development, Évry (France).

Author’s Contributions

The innovative design of the SAD study was conceived and set up by TD.

Both studies were carried out under the direction of TD and PM-B.

Analytical method development, validation and bioanalysis were performed by ED and PR.

Pharmacokinetic analysis was performed and interpreted by PR.

Both studies were analysed and interpreted by RRS, PM-B and TD.

The concept of this comparison was conceived by PM-B and RRS.

The first draft of the manuscript was prepared by RRS.

Subsequent drafts were revised by RRS, PM-B, TD, PR and ED.

The final version for submission was approved by RRS, PM-B, TD, PR and ED.

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Authors

Corresponding author

Correspondence to Rashmi R. Shah.

Ethics declarations

All procedures performed in the two studies were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

Conflict of interest

RRS, PM-B and TD are paid consultants to BIOPROJET and PR and ED are paid employees of BIOPROJET. PM-B is also a consultant to CARDIABASE, the centralized laboratory that analysed the ECGs from the two studies. The authors declare that they have no conflict of interest. The funding sources did not influence design and conduct of the study; collection, management, analysis, and interpretation of the data and preparation, review, or approval of the manuscript.

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Shah, R.R., Maison-Blanche, P., Robert, P. et al. Can an early phase clinical pharmacology study replace a thorough QT study? Experience with a novel H3-receptor antagonist/inverse agonist. Eur J Clin Pharmacol 72, 533–543 (2016). https://doi.org/10.1007/s00228-016-2023-3

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  • DOI: https://doi.org/10.1007/s00228-016-2023-3

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