Purpose: The purpose of this study was to investigate the stability of reconstituted infliximab solutions and determine whether infliximab is suitable for compounding for potential intravitreal use.
Methods: Infliximab was reconstituted, and the solution was aliquoted and stored refrigerated. On each day of testing, an aliquot was serially diluted to concentrations ranging from 50,000 pg/mL to 69 pg/mL. Each dilution was assayed by microsphere immunoassay daily for 5 days and weekly for a total of 6 weeks. The outcome measure was median fluorescence intensity measured by dual laser flow analysis of fluorochrome-labeled secondary antibodies to infliximab bound to tumor necrosis factor-alpha-coated microspheres.
Results: There was an increasing median fluorescence intensity for increasing infliximab concentration in a sigmoidal dose-response curve with a variable slope that was equivalent for each time point. Each respective concentration of infliximab showed nearly equivalent median fluorescence intensity for every time point over the 6-week period.
Conclusion: The authors found that the immunoreactivity of 2 different concentrations of infliximab stored at 4 degrees C over a 6-week period remained stable. Infliximab is suitable for compounding and could be a cost-effective intravitreal medication for use in clinical practice if further study supports its safety and efficacy.
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