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Research Article: DosEmi study protocol: a phase IV, multicentre, open-label, crossover study to evaluate non-inferiority of pharmacokinetic-guided reduced dosing compared with conventional dosing of emicizumab in people with haemophilia A

Date Published: 2023-06-26

Abstract:
Introduction Emicizumab effectively prevents bleeding in people with haemophilia A (PwHA), but is a burden for national healthcare budgets and consequently may limit access. According to the drug label, dosing of emicizumab is based on body weight with fixed intervals of 7, 14 or 28 days, which leads to mean plasma concentrations of 55?µg/mL (SD 15?µg/mL). However, a moderate variability of concentrations and a minimal effective concentration of 30?µg/mL have been suggested in studies. Therefore, a dose of emicizumab that targets a trough concentration of 30?µg/mL is hypothesised to be equally effective as conventional dosing in the prevention of bleeding. Methods and analysis We designed a phase IV, multicentre, open-label, crossover study to evaluate non-inferiority of bleed control of ?6 months on conventional dosing in comparison to ?6 months on dose intervention. This dose intervention consists of reducing the dose of emicizumab to target a trough concentrations of 30?µg/mL using individual pharmacokinetic (PK) parameters. Ninety-five PwHA aged >1 years who received conventional dosing of emicizumab for ?12 months with good bleeding control during the last 6 months will be recruited from all Dutch haemophilia treatment centres. The study is powered to detect a clinically relevant decrease (risk difference) of 15% in the proportion of patients without treated bleeds during follow-up. Secondary endpoints are spontaneous joint or muscle bleeds, and annualised treated bleeding rates (using negative binomial regression). Cost-effectivity between conventional dosing and individualised PK-guided dosing of emicizumab will be compared. Ethics and dissemination The DosEmi study was approved by the Medical Ethics Review Committee NedMec of the University Medical Center of Utrecht, The Netherlands. Study results will be communicated through publications in international scientific journals and presentations at (inter)national conferences. Trial registration number EUCTR2021-004039-10-NL at https://trialsearch.who.int . Protocol version V.4.1 on 28 October 2022 (DosEmi protocol_V4.1; NL81112.041.22).

Introduction:
People with haemophilia A (PwHA) have a deficiency of coagulation factor VIII (FVIII) and present with spontaneous or provoked bleeds, predominantly into major joints leading to painful and chronic arthropathy. 1 2 The cornerstone in the management of haemophilia A is still self-administration of FVIII concentrates by intravenous injections. 3 These injections are two to seven times weekly to prevent bleeds (prophylaxis), or at the time of bleeding (on demand) when prophylaxis is unavailable. Prophylaxis with…

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