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Plasminogen drug product stability study for intended use in ligneous conjunctivitis

Alfonso Salvatore*, Alessandro Carluccia, Marialetizia Carforaa, Zelinda Raiaa, Chiara Orazzoa, Valentina Maielloa, Marcella Maddalunoa, Renato Marinielloa, Luca Sanguignoa, Ciro Battagliaa, Roberto Creaa, Marta Bellinia, Anna Falboa and Ester Ascionea

Background: Ligneous conjunctivitis is rare pathology associated to congenital Type 1 plasminogen deficiency. It is characterized by the formation of fibrin rich pseudomebranes.

A Plasminogen-based drug has been manufactured by Kedrion biopharma and delivered to patients as compassionate use, showing its efficacy in regression and recurrence prevention of pseudomembranes. The plasminogen drug product is currently stored at <-20°C. Alternative storage conditions for patient use were investigated to establish drug product stability after thawing.

Study Design and Methods: The analyzed storage conditions were: the Refrigerator (2-8°C), room temperature (RT, 20-25°C) and high temperature (40°C).

108 Vials of Drug were thawed at RT and divided into three groups to perform three independent studies. 36 vials for each group were stored at 25°C or 40°C in climatic chamber or 2-8°C in a refrigerator. Time points were provided and main product Critical Quality Attributes (CQA) were analyzed: Protein Concentration (0.7-1.3 mg/mL), Plasminogen Potency (>5.0 U/mL), Protein Composition (SDS-Page, Plasminogen> 90%), Plasmin Activity (<0.005 UI/mL). The acceptance criteria (AC) were based on the Product Specifications when properly stored.

Results: CQA AC In 24 hours time point, Plasminogen Potency (3.81 U/mL) and Protein Concentration (0.64 mg/mL) were out of AC and Plasmin Activity (0.027 UI/mL) was found. In subsequent 36 hours time point specific degradation pattern were observed.

Data at 25°C indicated that all CQA were compliant with AC within 72 hours. Despite in subsequent 7 days time point Plasminogen Potency (5.72 U/mL) and Protein Concentration (0.84 mg/mL) were compliant, Plasmin Activity (0.084 UI/mL) and Protein Composition (88 %) were not compliant.

CQA remained within acceptance criteria at refrigerated conditions (2-8°C) for the whole study duration (1 month).

Conclusion: This study provide indications on the product stability for patient use. This data will allow the drug to be stored in more advantageous conditions for the patient.