RATIONALE AND BACKGROUND: Atopic dermatitis (AD) is the most common chronic inflammatory skin disease. Abrocitinib received marketing authorization for the European Union (EU) on 09 December 2021 and is indicated for the treatment of moderate to severe AD in adults who are candidates for systemic therapy. To mitigate the risks associated with abrocitinib, required routine RMMs including the SmPC and package leaflet are being employed. In addition to the routine RMMs, additional RMMs (aRMMs) inclulding prescriber’s brochure and patient card, are being implemented in the EU.
RESEARCH QUESTION AND OBJECTIVES: The study objectives are to evaluate, to the extent measurable in the available routinely collected data, indicators of HCPs’ adherence to the RMMs in accordance with the abrocitinib SmPC and prescriber’s brochure, assessed by:
– indicators of adherence to performing laboratory tests of CBC, lipid panel, hepatitis B/C, and TB screening prior to initiation of abrocitinib treatment,
– indicators of adherence to performing laboratory tests of CBC and lipid panel at week 4 (±2 weeks) after initiation of abrocitinib treatment,
– indicators of adherence to consideration of risk factors for VTE, MACE, malignancy and serious infection prior to treatment with abrocitinib,
– indicators of adherence to avoid live attenuated vaccines immediately prior to and during treatment with abrocitinib,
– indicators of adherence to contrainidcations for use during pregnancy,
– indicators of adherence to contraindications for use amog patients with severe hepatic impairment,
– indicators of adherence to no use in patients aged < 18 years, and
- indicators of adherence to recommended posology (estimated average daily dose).
STUDY DESIGN: This will be a descriptive drug utilization study using secondary data from healthcare databases in Denmark, France, Sweden, Spain and Hungary.
POPULATION: The study population will include patients with a dispensing of abrocitinib as recorded in routinely collected electronic healthcare data in Denmark, France, Sweden, Spain and Hungary during the study period (study start: country-specific aRMM distribution [01 March 2022, Sweden; 09 March 2022, Denmark; 31 July 2022, France; 30 Jan 2023, Spain; September 2023 (estimated), Hungary]; study end: December 2026). These countries have universal healthcare.
VARIABLES: The study will collect all relevant data including patient demographics, comorbidities, prescription medications, vaccine administration, and laboratory testing prior to the initiation of abrocitinib and during treatment with abrocitinib to address the study objectives.
DATA SOURCES: This study will utilize routinely collected electronic healthcare data from national or regional population-based electronic healthcare registers in Denmark, Sweden and Spain and an administrative healthcare databases in France and Hungary.
STUDY SIZE: All patients initiating abrocitinib during the study period will be included.
DATA ANALYSIS: Data will be analysed in each country separately using a common protocol, database-specific definitions of the study variable, and common analysis strategy. The main indicators will be proportions of abrocitinib users with a given indicator of aRMM adherence.