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A comparative clinical study of PF-06410293, a candidate adalimumab biosimilar, and adalimumab reference product (Humira®) in the treatment of active rheumatoid arthritis

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Fleischmann RM1, Alten R2, Pileckyte M3, Lobello K4, Hua SY5, Cronenberger C4, Alvarez D4, Bock AE6, Sewell KL6. Arthritis Res Ther. 2018 Aug 15;20(1):178. doi: 10.1186/s13075-018-1676-y.


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1 Southwestern Medical Center, Metroplex Clinical Research Center, University of Texas, 8144 Walnut Hill Lane, Suite 810, Dallas, TX, 75231, USA. rfleischmann@arthdocs.com.

2 Schlosspark-Klinik, University Medicine Berlin, Heubnerweg 2, Berlin, 14059, Germany.

3 Department of Rheumatology, Hospital of Lithuanian University of Health Sciences, Eiveniu str.2, Kaunas, LT, 50161, Lithuania.

4 Pfizer Inc., 500 Arcola Road Collegeville, Collegeville, PA, 19426, USA.

5 Pfizer Inc., 10777 Science Center Drive, CB1/2103, San Diego, CA, 92121, USA.

6 Pfizer Inc., 300 Technology Square, Cambridge, MA, 02139, USA.


BACKGROUND: This double-blind, randomized, 78-week study evaluated the efficacy, safety, immunogenicity, pharmacokinetics, and pharmacodynamics of PF-06410293, a candidate adalimumab biosimilar, versus adalimumab reference product (Humira®) sourced from the EU (adalimumab-EU) in biologic-naïve patients with active rheumatoid arthritis (RA) despite methotrexate (MTX) (10-25 mg/week). We report results for the first 26 weeks of treatment.

METHODS: Patients with active RA (N = 597) were randomly assigned (1:1) to PF-06410293 or adalimumab-EU, while continuing with MTX treatment. The primary endpoint was American College of Rheumatology 20% improvement (ACR20) at week 12. Therapeutic equivalence was concluded if the two-sided 95% confidence interval (CI) for the ACR20 difference between the two arms was entirely contained within the symmetric equivalence margin (±14%). Additionally, a two-sided 90% CI was calculated by using an asymmetric equivalence margin (-12%, 15%). Secondary efficacy endpoints to week 26 included ACR20/50/70, change from baseline Disease Activity Score based on high-sensitivity C-reactive protein [DAS28-4(CRP)], European League Against Rheumatism (EULAR) response, DAS28-4(CRP) of less than 2.6, and ACR/EULAR remission. QuantiFERON-TB testing was performed at screening and week 26.

RESULTS: Patients (78.7% of whom were female and whose mean age was 52.5 years) had a mean baseline RA duration of 6.8 years. The mean baseline DAS28-4(CRP) values were 5.9 (PF-06410293) and 6.1 (adalimumab-EU). The observed week-12 ACR20 values were 68.7% (PF-06410293) and 72.7% (adalimumab-EU) in the intention-to-treat population. With non-responder imputation, the treatment difference in week-12 ACR20 was -2.98% and corresponding CIs-95% CI (-10.38%, 4.44%) and 90% CI (-9.25%, 3.28%)-were entirely contained within the equivalence margins (symmetric and asymmetric, respectively). The secondary efficacy endpoints were similar between arms. Over 26 weeks, injection-site reactions occurred in 1.7% versus 2.0%, hypersensitivity events in 4.4% versus 8.4%, pneumonia in 0.7% versus 2.0%, and opportunistic infections in 2.4% versus 1.7% in the PF-06410293 and adalimumab-EU arms, respectively. One death due to myocardial infarction occurred (adalimumab-EU arm). Rates of anti-drug antibody incidence were 44.4% (PF-06410293) and 50.5% (adalimumab-EU).

CONCLUSIONS: The study results demonstrate that efficacy, safety, and immunogenicity of PF-06410293 and adalimumab-EU were similar during the first 26 weeks of treatment in patients with active RA on background MTX.

TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT02480153 . First posted on June 24, 2015; EU Clinical Trials Register EudraCT number: 2014-000352-29 . Start date: October 27, 2014.