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Persistence,switchrates,drugconsumptionandcostsofbiologicaltreatmentofrheumatoidarthritis:anobservationalstudyinItaly.
Abstract
OBJECTIVE:
Theaimofthisanalysiswastoprovideanestimateofdrugutilizationindicators(persistence,switchrateanddrugconsumption)onbiologicsandthecorrespondingcosts(drugs,admissionsandspecialistcare)incurredbytheItalianNationalHealthServiceinthemanagementofadultpatientswithrheumatoidarthritis(RA).
METHODS:
Weconductedanobservationalretrospectivecohortanalysisusingtheadministrativedatabasesofthreelocalhealthunits.Weconsideredallpatientsaged¡Ý18yearswithadiagnosisofRAandatleastonebiologicdrugprescriptionbetweenJanuaryandDecember(recruitmentperiod).Persistencewasdefinedasmaintenanceoverthelast3monthsofthefollow-upperiodofthesamebiologicaltherapyadministeredattheindexdate.Aswitchwasdefinedasthepresenceofabiologicaltherapyotherthanthatadministeredattheindexdateduringthelast3monthsofthefollow-upperiod.Hospitaladmissions(withadiagnosisofRAorotherRA-relateddiagnoses),specialistoutpatientservices,instrumentaldiagnosticsandpharmaceuticalconsumptionwereassessed.
RESULTS:
Thedrugutilizationanalysistookintoaccountonlybiologicswithatleast90patientsontreatmentatbaseline(adalimumabn=,etanerceptn=andinfliximabn=94).Ineachyear,etanerceptshowedbetterpersistencewithinitialtreatmentthanadalimumaborinfliximab.Etanerceptwascharacterizedbythelowestnumberofpatientsincreasingtheinitialdrugconsumption(2.6%)andbythehighestnumberofpatientsreducingtheinitialdrugconsumption(10.5%).Themeancostoftreatmentforapatientpersistingwiththeinitialtreatmentwas€12,(€14,foradalimumab,€12,foretanerceptand€11,forinfliximab).Thetreatmentcostsforpatientsswitchingfrominitialtreatmentduringthefirstyearoffollow-upwerehigherthanforpatientswhodidnotswitch(€12,vs.€11,).
CONCLUSION:
Persistence,switchrateanddrugconsumptionseemtodirectlyinfluencetreatmentcosts.Insubjectsnotpersistingwithinitialtreatment,otherhealthcarecostswereapproximatelythreetimeshigherthanforpersistentpatients.Thisdifferencecouldsuggestapositiveeffectonthequalityoflifeforpersistentpatients.Etanerceptshowedthehighestpersistencewithtreatment.
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