Original article
Clinical similarity of biosimilar ABP 501 to adalimumab in the treatment of patients with moderate to severe plaque psoriasis: A randomized, double-blind, multicenter, phase III study

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Background

ABP 501 is a biosimilar of adalimumab.

Objective

We sought to compare the efficacy and safety of ABP 501 with adalimumab.

Methods

This 52-week, double-blind study randomized patients with moderate to severe psoriasis to ABP 501 or adalimumab. At week 16, those with 50% or more improvement in Psoriasis Area and Severity Index score from baseline on ABP 501 continued the same treatment, whereas adalimumab-treated patients were rerandomized to adalimumab or ABP 501. Clinical similarity in Psoriasis Area and Severity Index percent improvement from baseline to week 16 (primary end point) was established if the point estimate of treatment difference and its 2-sided 95% confidence interval between groups was within equivalence margin of ±15. Patients, including those undergoing a single transition at week 16, were evaluated for safety and immunogenicity.

Results

Psoriasis Area and Severity Index percent improvement at week 16 was 80.9 for ABP 501 and 83.1 for adalimumab (least-square mean difference −2.18 [95% confidence interval −7.39 to 3.02]). Adverse events (67.2% [117/174] vs 63.6% [110/173]) and antidrug antibody incidence (55.2% [96/174] vs 63.6% [110/173]) for ABP 501 vs adalimumab were similar. Safety, including immunogenicity, was similar among groups after single transition (week 20).

Limitations

The 52-week data are not reported here.

Conclusions

ABP 501 was shown to be clinically similar to adalimumab. Safety and immunogenicity were not impacted immediately after single transition (adalimumab to ABP 501).

Key words

ABP 501
adalimumab
biosimilar
efficacy
equivalence
psoriasis
safety

Abbreviations used

ADA
antidrug antibody
CI
confidence interval
PASI
Psoriasis Area and Severity Index
PASI 50
50% or more improvement in Psoriasis Area and Severity Index score from baseline
PASI 75
75% or more improvement in Psoriasis Area and Severity Index score from baseline
PASI 90
90% or more improvement in Psoriasis Area and Severity Index score from baseline
PASI 100
100% improvement in Psoriasis Area and Severity Index score from baseline
SAE
serious adverse event
TEAE
treatment-emergent adverse event
TNF
tumor necrosis factor

Cited by (0)

Amgen Inc funded this study and participated in the design and conduct of the study; collection, management, analysis, and interpretation of data; and preparation, review, and approval of the manuscript. All authors were involved in the decision to submit the manuscript for publication, and had the right to accept or reject comments or suggestions. A medical writer employed by MedVal Scientific Information Services LLC and funded by Amgen Inc participated in the writing of this manuscript and is acknowledged.

Disclosures: Dr Papp has served as a consultant, speaker, scientific officer, steering committee member, investigator, or advisory board member for 3M, Abbott, Akesis, Akros, Alza, Amgen, Astellas, Baxter, BMS, Boehringer Ingelheim, CanFite, Celgene, Cipher, Dermira, Eli Lilly, Forward Pharma, Funxional Therapeutics, Galderma, GSK, Isotechnika, Janssen, Johnson & Johnson, Kirin, Kyowa, Lypanosys, MedImmune, Merck-Serono, Mitsubishi Pharma, MSD, Novartis, Pfizer, Roche, Takeda, UCB, Valeant, and Vertex. Dr Bachelez has served as a consultant, speaker, steering committee member, investigator, or advisory board member for AbbVie, Amgen, Baxalta, Boehringer-Ingelheim, Celgene, Janssen, LEO Pharma, Lilly, MSD, Novartis, Pfizer, and Takeda, and received grant support from Pfizer. Dr Costanzo has been an investigator/consultant and speaker for AbbVie, Amgen, Celgene, Janssen, Lilly, Novartis, and Pfizer. Dr Foley has served as a consultant, investigator, speaker, and/or advisor for, and/or received travel grants from Galderma, LEO Pharma/Peplin, Ascent, Clinuvel, Janssen-Cilag, Eli Lilly, Australian Ultraviolet Services, Roche, CSL, 3M/iNova/Valeant, GSK/Stiefel, Abbott/AbbVie, Biogen Idec, Merck Serono, Schering-Plough/MSD, Wyeth/Pfizer, Amgen, Novartis, Celgene, Aspen, Boehringer Ingelheim, and BMS. Dr Gooderham has been an investigator, consultant, and/or speaker for AbbVie, Amgen, Boehringer Ingelheim, Celgene, Coherus, Dermira, Galderma, Janssen, LEO Pharma, Lilly, Medimmune, Merck Serono, Novartis, Regeneron, Roche, Sanofi Genzyme, Takeda, and Pfizer. Dr Kaur is an Amgen employee and stockholder. Dr Narbutt is an investigator for Amgen. Dr Philipp has been investigator, consultant, and/or speaker for AbbVie, Amgen, Almirall, Biogen, Boehringer-Ingelheim, BMS, Celgene, Janssen, LEO Pharma, Lilly, MSD, Novartis, Pfizer, and UCB. Dr Spelman has served on advisory boards for Galderma, Novartis, and AbbVie; undertakes sponsored clinical research for AbbVie, Amgen, Anacor, Ascend Biopharmaceuticals, Astellas, Australian Wool Innovation Limited, Blaze Bioscience, Celgene, Dermira, Eli Lilly, Galderma, Genentech, GlaxoSmithKline, Kythera, LEO Pharma, Merck, Novartis, Phosphagenics, Regeneron, and Trius; and has received sponsored travel from Abbott, Novartis, and Janssen-Cilag. Dr Weglowska has been an investigator for Amgen, Pfizer, Novartis, Galderma, Eli Lilly, Dermira, Roche, Janssen-Cilag, Coherus, Genentech, LEO Pharma, Merck, Mylan, and Regeneron. Dr Zhang is an Amgen employee and stockholder. Dr Strober has served on a speakers bureau for AbbVie, receiving honoraria; is a consultant and advisory board member for AbbVie, Amgen, Astra Zeneca, Celgene, Dermira, Forward Pharma, Janssen, LEO Pharma, Eli Lilly, Cutanea-Maruho, Medac, Novartis, Pfizer, Sun, Stiefel/GlaxoSmithKline, UCB, and Boehringer Ingelheim, receiving honoraria for all; is an investigator for AbbVie, Amgen, GlaxoSmithKline, Novartis, Lilly, Janssen, Merck, XenoPort, Xoma, Celgene (payments to the University of Connecticut); is scientific director for Corrona Psoriasis Registry, receiving a consulting fee; received grant support to the University of Connecticut for a fellowship program from AbbVie and Janssen.

Presented as an abstract by Dr Papp et al at the 24th Annual Congress of the European Academy of Dermatology and Venereology, Copenhagen, Denmark, October 7-11, 2015; in Strober B, et al. Evaluation of efficacy and safety of ABP 501 in a phase 3 study in subjects with moderate to severe plaque psoriasis: 52-week results. J Am Acad Dermatol 2016;74(Suppl):AB249; and in Gooderham M, et al. Single transition from adalimumab to ABP 501: evaluation of immunogenicity in a phase 3 study in subjects with moderate to severe plaque psoriasis. J Am Acad Dermatol 2016;74(Suppl 1):AB275.