AbstractBackground
The givosiran Expanded Access Trial is an open-label, multicenter, single-arm study designed to provide access to investigational givosiran for patients with acute hepatic porphyria (AHP) who have limited or no available treatment options and for whom the treating physician believes the benefits outweigh the risks. The effects of givosiran were evaluated in an exploratory manner.
Results
Givosiran was administered to 10 patients: three patients who continued from the Phase III clinical study (the ENVISION study) and seven newly included patients from this study. Low aminolevulinic acid and porphobilinogen levels were maintained. Two porphyria attacks were reported by the patients; however, both were mild and did not require hemin or hospitalization. In the Givosiran Patient Experience Questionnaire, eight of the 10 patients reported symptom improvement. Adverse events occurred in eight cases, five of which were suspected to be causally associated with givosiran. All adverse events were non-serious, and there were no deaths; however, one patient discontinued treatment due to alopecia.
Conclusion
This study demonstrates that AHP patients on once-monthly administration of givosiran experienced clinical benefits, and there was an acceptable safety profile.
Trial registration: jRCT2071200074. Registered Dec. 24, 2020, https://jrct.niph.go.jp/en-latest-detail/jRCT2071200074