RATIONALE AND BACKGROUND:
Retinoic acid analogues comprise of a group of active substances known as the retinoids and are available as topical and oral preparations. Therapeutic indications include the treatment of severe acne (such as nodular or conglobate acne) resistant to adequate courses of standard therapy, hand eczema resistant to empirical treatment measures, and severe forms of psoriasis and other skin conditions.
Therapy with systemic retinoids is associated with teratogenicity. Therefore, women who are pregnant or are planning a pregnancy must not be prescribed retinoids. Strict prescription guidelines and a PPP comprising education material for patients, physicians, and pharmacists as well as strict prescription guidelines have been put in place but exposure during pregnancy still occurs. In January 2016, a Pharmacovigilance Risk Assessment Committee (PRAC) review noted that there are concerns about how well the requirements of the PPP are followed in clinical practice. In July 2016, the PRAC initiated an article 31 referral to assess the effectiveness of risk minimisation in relation to the PPP. After completion of the review in March 2018, the European Medicines Agency (EMA) confirmed that an update of measures of the PPP for the oral retinoids acitretin, alitretinoin and isotretinoin is needed. They, therefore, mandated the conduct of a DUS (category 1) to assess the effectiveness of these updated risk minimisation measures (RMMs). In June 2018, the decision to strengthen the recommendations for pregnancy prevention for oral retinoids was issued by the European Commission (EC).
RESERACH QUESTION AND OBJECTIVES:
The aim of the Drug Utilizacion Study (DUS) is to address the following research question:
Is there a difference in physicians’ prescribing and monitoring practice in the periods before and after the update of the pregnancy prevention programme (PPP) for the oral retinoids acitretin, alitretinoin, and isotretinoin when treating women of childbearing potential?
PRIMARY OBJECTIVE:
To evaluate the changes in the prescribing and monitoring practices following the update of the PPP in females of childbearing potential receiving prescriptions of the oral retinoids acitretin, alitretinoin, or isotretinoin by comparing the following key elements of the PPP between the pre- and the postimplementation period:
? Contraceptives* before, during, and after treatment with oral retinoids
? Time interval between prescription dates for oral retinoids during treatment episode
? Laboratory pregnancy tests ? where available – before, during, and after treatment with oral retinoids
* contraceptive methods that require prescription and which are, therefore, captured in the administrative databases
SECONDARY OBJECTIVES:
? To describe the patient profile during the pre-and the post-implementation period, with respect to:
o Patient age
o Indication for oral retinoids
? To describe the prescriber specialty during the pre-and the post-implementation period
? To describe the exposure characteristics during the pre-and the post-implementation period, with respect to:
o Active substance
o Dose
o Treatment duration
? To describe the incidence of pregnancies exposed to oral retinoids during the pre- and the post-implementation period
? To stratify the key elements of the PPP described in the primary objective by oral retinoid substance
? To describe trends in the physician?s prescribing and monitoring practice of oral retinoids with respect to measures of the PPP (contraceptive use and performance of pregnancy tests) over the entire duration the study
STUDY DESIGN:
This is a multicountry, multisource, observational cohort study in females of childbearing potential receiving oral retinoids (i.e., acitretin, alitretinoin and isotretinoin) using a pre-post design. This study will cover time periods before and after the implementation of the updated RMMs related to the PPP update. The study will be based on secondary use of data extracted from established longitudinal healthcare databases (claims, primary care database, national registries). The pre-implementation period consists of 2 distinct phases, a 2-year phase (07/2014 to 06/2016) prior to the start of the referral in July 2016 and a 2.5-year phase between the start of the referral and the distribution of EM for the updated PPP in Q4 2018. The post-implementation period captures the 2-year phase after the distribution of the EM (01/2019 to 12/2020).
POPULATION:
The study population will consist of females of childbearing potential (13-49 years of age, inclusive) receiving oral retinoids (i.e., acitretin, alitretinoin and isotretinoin) in the outpatient setting (at officebased practices and outpatient departments at hospitals), during the pre-defined periods identified from the selected data sources in the European target countries (i.e., France, Germany, Spain, and Sweden).
INCLUSION CRITERIA:
? Female gender
? Childbearing potential (13-49 years of age, inclusive)
? Received or prescribed at least one prescription of the oral retinoids acitretin, alitretinoin, or isotretinoin in either the pre-implementation or post-implementation period
EXCLUSION CRITERIA:
All females in the age group 13 to 49 years with available information that they are not of childbearing potential before initiation of oral retinoids (such as records of hysterectomy or sterilisation) will be excluded.
Data for the oral retinoids acitretin, alitretinoin, and isotretinoin will only be extracted from databases in target countries where the respective active substance has been granted market authorisation.
No further exclusion criteria will be applied.
VARIABLES:
The exposure is defined as one or more prescriptions of oral retinoids (i.e., acitretin, alitretinoin, orisotretinoin) during one of the study periods. The following variables will be considered (if available):
patient age, oral retinoid prescribing and monitoring practice such as indication, length of prescription, treatment duration, and prescriber speciality, as well as PPP-specific variables such as prescriptions of contraceptive and ? if available – laboratory pregnancy testing (before, during, and after treatment). In addition, information on exposed pregnancies and outcomes (if available) will be provided.
DATA SOURCES:
The following established longitudinal data sources will be utilised for data extraction:
Claims databases
? France: System National d’Information Inter-Régimes de l’Assurance Maladie (SNIIRAM) of the Système National des Données de Santé (SNDS)
? Germany: Collective of insurants from company health insurance funds Primary care database
? Spain: Sistema d?Informació per al Desenvolupament de l?Investigació en Atenció Primària (SIDIAP)
National health registers
? Sweden: national drug-, patient-, and birth registers
Study size:
All females of childbearing potential receiving oral retinoids (i.e. acitretin, alitretinoin, isotretinoin) available in pre-defined periods of the selected databases will be included in the analysis.
The number of females of childbearing potential receiving oral retinoids was checked for a 3-year
period (2015-2017) in Germany, Spain, and Sweden. The number of patients is approximately 3,700 in Germany, 4,800 in Spain, and 20,500 in Sweden.
In France, only the number of boxes that was reimbursed in France in total (without any restriction to age and gender) is available without receiving ethical approval for the study, the number of approximately 1,041,000 boxes in one year suggests that the number of female patients of childbearing potential receiving oral retinoids will be sufficient for analysis.
DATA ANALYSIS:
Given the study objectives, the analyses will mainly be descriptive and will be conducted by country and study time periods (both pre-implementation periods and post-implementation period). Some comparisons will be made especially between the different study time periods.
The analyses will be provided for the overall class of oral retinoids (acitretin, alitretinoin and isotretinoin) and for the single active substances.
Results for key variables will be presented over time where patient numbers permit to provide insights on continuous trends capturing pre- and post-implementation periods.
In addition, an interrupted time series (ITS) analysis will be considered in case the conditions for this analysis will be met.