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Infliximab is an effective treatment for patients with refractory inflammatory bowel disease (IBD) and is well established in treatment algorithms. Biosimilar infliximab will become available in the UK from early 2015 as the patent for originator infliximab (Remicade) ends. Potentially this is a time of uncertainty for IBD teams and patients as, although biosimilar infliximab is approved for the same indications as the originator product, there is a lack of high-quality data supporting its use in IBD. The attraction of biosimilars is that they will result in a significant reduction in the price of infliximab which it is hoped will ease patient access to anti-tumour necrosis factor (TNF) therapy.
Biologics are medications that are manufactured in or derived from a biological product. A biosimilar is a medicinal product based on the same design as a biological drug. However, the production of biosimilars is vastly more complicated than that of simple generic molecules and, as a result, biosimilars must meet strict specifications regarding their efficacy and safety laid down by regulatory authorities such as the FDA and EMA (box 1).
Definitions of a biosimilar from the FDA and EMA
Highly similar to the reference product notwithstanding minor differences in clinically inactive compounds. No clinically meaningful differences between the biological product and reference product in terms of safety, purity and potency.
EMA definition: …
Contributors RKR, PI and CP all contributed equally to the idea and generation of the article. All authors have seen and approved the final draft.
Funding RKR has received support from a Medical Research Council (MRC) patient research cohorts initiative grant (G0800675) for PICTS. RKR is supported by an NHS Research Scotland career fellowship award. The work of the IBD team at Yorkhill is supported by the Catherine McEwan Foundation and the Yorkhill IBD fund.
Competing interests RKR has received speaker's fees, travel support or participated in medical board meetings with MSD Immunology, Abbott, Dr Falk, Nestle, Janssen, NAPP and Ferring Pharmaceuticals. PI has received honoraria for acting in an advisory capacity or speaking on behalf of Warner Chilcott, Shire, Ferring, Tillotts Pharma, Vifor, Pharmacosmos, Takeda, MSD, Abbvie and Genentech. CP has received honoraria for acting in an advisory capacity or speaking on behalf of Abbvie, Falk, Ferring, Hospira, MSD, Napp, Shire, Takeda, Tillotts and Warner Chilcott.
Provenance and peer review Not commissioned; externally peer reviewed.