Effectiveness and Safety of Switching Originator and Biosimilar Epoetins in Patients with Chronic Kidney Disease in a Large-Scale Italian Cohort Study.

Abstract:

INTRODUCTION:Real-world data on the comparative effectiveness and safety of switching among different epoetins (including originators and biosimilars) are limited. In light of current debate about interchangeability, prescribers, some patient groups and decision makers are calling for additional post-marketing evidence on the clinical effects of switching between originator and biosimilar epoetins in chronic kidney disease (CKD) patients. OBJECTIVE:The objective of this study was to evaluate the effectiveness and safety of switching versus non-switching and of switching from originator/biosimilar epoetin alpha (ESA α) to any other epoetin in CKD patients. METHODS:An observational, record-linkage, multi-database, retrospective cohort study was carried out in four Italian geographical areas. All subjects with at least one ESA α dispensing between 1 January 2009 and 31 December 2015 were retrieved. Switching was defined as any transition between originator/biosimilar ESA α to any other epoetin in a series of two consecutive prescriptions up to 2 years. Switchers were matched 1:1 with non-switchers by baseline propensity score and by duration of ESA α treatment. Switchers and non-switchers were followed up from switching date to a maximum of 1 year. Lack of effectiveness and safety of switching versus non-switching were evaluated through Cox regression models (hazard ratio [HR], 95% confidence interval [CI]). A direct comparison between the two switcher categories (switchers from originator/biosimilar ESA α to any other epoetin) was also performed. RESULTS:Overall, 14,400 incident users of ESA α for anaemia due to CKD (61.4% originator, 38.6% biosimilar) were available for analysis. During the follow-up, we found no differences on effectiveness (HR 1.02, 95% CI 0.79-1.31 originators; HR 1.16, 95% CI 0.75-1.79 biosimilars) and safety outcomes (HR 1.08, 95% CI 0.77-1.50 originators; HR 1.20, 95% CI 0.66-2.21 biosimilars) between switchers and non-switchers of ESA α. Cumulative probabilities of recording an adverse event, either in terms of lack of effectiveness or safety issue, were the same for two switching categories CONCLUSIONS: In this large-scale Italian observational multi-database study, switching versus non-switching as well as switching from biosimilar/originator ESA α to any other epoetin in CKD patients is not associated with any effectiveness and safety outcomes.

journal_name

Drug Saf

journal_title

Drug safety

authors

Belleudi V,Trotta F,Addis A,Ingrasciotta Y,Ientile V,Tari M,Gini R,Pastorello M,Scondotto S,Cananzi P,Traversa G,Davoli M,Trifirò G,Italian Biosimilar Network (ItaBioNet).

doi

10.1007/s40264-019-00845-y

subject

Has Abstract

pub_date

2019-12-01 00:00:00

pages

1437-1447

issue

12

eissn

0114-5916

issn

1179-1942

pii

10.1007/s40264-019-00845-y

journal_volume

42

pub_type

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