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The role of hospital pharmacists in gene therapy preparation

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European Statement

Production and Compounding

Author(s)

Lucija Tominović Gjivić, Gabrijela Kos, Anita Šimić

Why was it done?

In order to ensure correct use of voretigene neparvovec and minimise the risks associated with its administration, the product can be distributed only through treatment centres where qualified staff (vitreoretinal surgeons and pharmacists) have participated in the mandatory risk management plan (RMP) education program required by EMA.
Since voretigene neparvovec has to be transported and stored frozen at ≤-65 ºC, has short shelf life after dilution (4 hours), contains genetically modified organisms and must be handled according to local biosafety guidelines, there was a need for establishing standard operating procedures (SOPs) for each step of the treatment process.

What was done?

The University Eye Clinic, University Hospital Sveti Duh in Zagreb, Croatia, was designated as the world’s 6th gene therapy centre in 2020.
Hospital pharmacists, as part of a multidisciplinary team, play an important role in preparation and administration of the gene therapy product voretigene neparvovec which is indicated for the treatment of patients with vision loss due to inherited retinal dystrophy caused by biallelic RPE65 (retinal pigment epithelium-specific 65 kilodalton protein) mutations.

How was it done?

The multidisciplinary team consists of a paediatric ophthalmologist, an inherited retinal disease specialist, retinal surgeons, pharmacists and nurses.
SOPs were created for: ordering process, storage of the product, coordination between members of the multidisciplinary team, preparation of the product, administration and disposal of waste.
Preparation of voretigene neparvovec is performed under aseptic conditions in a Class II vertical laminar flow biological safety cabinet (BSC) according to Pharmacy Manual which was ensured by the manufacturer.

What has been achieved?

Since 2020. there had been 47 dose applications of voretigene neparvovec (26 patients, Croatian and nonCroatian citizens).
The prevalence of inherited retinal dystrophy associated with biallelic RPE65 mutation is 1:200 000 and it is expected that there are 19 individuals (population of 3,8, million) with biallelic RPE65 mutation in Croatia, and 13 of them were detected since 2020.
There were no registered side effects which could be associated with errors during the preparation or administration of voretigene neparvovec.

What next?

With the increasing number of gene and cell-based therapies, the need for continuous education of hospital pharmacists and exchange their experiences is greater than ever.

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