Extrapolation of indications in biosimilars: filgrastim

Generics and biosimilars Initiative

Building trust in cost-effective treatments

Inscribirse
eng / esp

Extrapolation of indications in biosimilars: filgrastim

Biosimilares/Investigación | Posted 21/11/2014 0 Post your comment

Extrapolation* of indications for biosimilars is a contentious issue and has been met with concern by physicians. Members of the European Medicines Agency's (EMA) Biosimilar Medicinal Products Working Party (BMWP) address these concerns using extrapolation of indications in biosimilar filgrastim as an example [1].

Filgrastim is approved for treatment of neutropenia (low white blood cell count in the blood) and for the mobilization of peripheral blood stem cells in patients and healthy donors. Several filgrastim biosimilars have been licensed in Europe and, in all cases; all indications of the originator product were approved.

There has been criticism by some societies of the extrapolation to stem cell mobilization in healthy donors. However, the scientific arguments below support the extrapolation granted by EMA’s Committee for Medicinal products for Human Use:

All licensed filgrastim biosimilars demonstrated a high level of similarity in molecular structure and biological activity with their reference products.
Pharmacokinetic profiles were comparable ensuring equivalent exposure.
All pharmacological actions of filgrastim are mediated via a single affinity class cell receptor. Therefore, comparable receptor binding is expected to result in comparable effects.
Comparable pharmacodynamic activities were confirmed in healthy subjects and/or patients.
The safety and immunogenicity profiles were found to be comparable to those of the reference product, in patients and in pharmacology studies in healthy subjects.

The fact that post-marketing studies have confirmed the efficacy and safety of filgrastim biosimilars in the approved indications including the mobilization of stem cells in healthy donors justifies EMA’s decision on extrapolation [2, 3].

*Extrapolation involves extending and applying the data from clinical studies regarding one medical condition to another medical condition.

Disclaimer
The authors of the research paper [1] declared that they are members or experts of the European Medicines Agency's (EMA) Biosimilar Medicinal Products Working Party (BMWP). This paper [1] represents solely the views of the authors and should not be understood or quoted as being made on behalf of or reflecting the position of EMA or its committees.

Conflict of interest
The authors of the research paper [1] declared that there were no conflicts of interest.

Editor’s comment
If you are interested in contributing a research paper in a similar area to GaBI Journal, please send us your submission here.

If you would like to receive a PDF copy* of the Weise et al. paper [1], please send us an email.

^{*For profit organizations subjected to a fee}

Related articles
Extrapolation for biosimilars

Biosimilars: similar but not identical

Extrapolation of indications in biosimilars: epoetin

Extrapolation of indications in biosimilars: infliximab

References
1.   Weise M, Kurki P, Wolff-Holz E, Bielsky MC, Schneider CK. Biosimilars: the science of extrapolation. Blood. 2014 Oct 8. pii: blood-2014-06-583617. [Epub ahead of print]
2.   GaBI Online - Generics and Biosimilars Initiative. Mobilization of stem cells in healthy donors by G-CSF biosimilars shows comparable efficacy and safety to Neupogen [www.gabionline.net]. Mol, Belgium: Pro Pharma Communications International; [cited 2014 Nov 21]. Available from: www.gabionline.net/Biosimilars/Research/Mobilization-of-stem-cells-in-healthy-donors-by-G-CSF-biosimilars-shows-comparable-efficacy-and-safety-to-Neupogen
3.   GaBI Online - Generics and Biosimilars Initiative. Biosimilar G-CSF safe for mobilization of stem cells [www.gabionline.net]. Mol, Belgium: Pro Pharma Communications International; [cited 2014 Nov 21]. Available from: www.gabionline.net/Biosimilars/Research/Biosimilar-G-CSF-safe-for-mobilization-of-stem-cells

Permission granted to reproduce for personal and non-commercial use only. All other reproduction, copy or reprinting of all or part of any ‘Content’ found on this website is strictly prohibited without the prior consent of the publisher. Contact the publisher to obtain permission before redistributing.