Remibrutinib in real-world clinical practice: a prospective, multi-country, non-interventional, effectiveness and safety study (REASSERT)

27/01/2026
03/02/2026
EU PAS number:
EUPAS1000000889
Study
Ongoing
Study type

Study topic

Human medicinal product

Study type

Non-interventional study

Scope of the study

Effectiveness study (incl. comparative)
Safety study (incl. comparative)
Non-interventional study

Non-interventional study design

Cohort
Study drug and medical condition

Anatomical Therapeutic Chemical (ATC) code

(L04AA60) remibrutinib
remibrutinib

Medical condition to be studied

Chronic spontaneous urticaria
Population studied

Short description of the study population

Patients with CSU where the treatment decision prior enrolment has been made to either escalate current sgH1-AHs treatment or escalate/switch current treatment to remibrutinib

Estimated number of subjects

3277
Study design details

Study design

Prospective, multi-country, non-interventional study in patients with CSU where the treatment decision prior enrolment has been made to either escalate current sgH1-AHs treatment or escalate/switch current treatment to remibrutinib

Main study objective

Evaluate the 12-week real-world effectiveness of remibrutinib in adult patients diagnosed with CSU who remain inadequately controlled despite sgH1-AHs (including all patients who initiate remibrutinib, regardless of prior treatment).

Setting

This is a prospective, multi-country, non-interventional study in patients with CSU where the treatment decision prior enrolment has been made to either escalate current sgH1-AHs treatment or escalate/switch current treatment to remibrutinib.
The primary aim of this study is to gather real-world effectiveness and safety data for remibrutinib, a new treatment option, covering a broader, real-world clinical practice population at a wider range of sites than in the Phase 2 and Phase 3 (REMIX) development trials.
The study employs an umbrella design which brings together the evidence needs from multiple countries under the REASSERT global program.
Countries will generate local study documentation (i.e. concept, protocol, SAP) to be applied in their country; the local study documentation will be a minimised version of the global document set, modified to align with country’s evidence needs, given local disparities in treatment guidelines, access, physician type and ePROs/eDiaries used. To achieve the core objectives the observation needs to include either the Urticaria Control Test (UCT) or Urticaria Activity Score over 7 days (UAS7) and the Dermatology Life Quality Index (DLQI). These, and safety data must be observed across all participating countries.
Data from all countries will be pooled and analyzed globally. In certain instances, some modifications of the global protocol may be permitted. For example, in countries where prospective monitoring of off-label antihistamines is prohibited, cohort 1 will not be enrolled.