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Tofersen: First Approval

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posted on 2023-06-06, 19:04 authored by Hannah A. Blair


Funding The preparation of this review was not supported by any external funding.

Authorship and Conflict of interest During the peer review process, the manufacturer of the agent under review was offered an opportunity to comment on the article. Changes resulting from any comments received were made by the authors on the basis of scientific completeness and accuracy. Hannah Blair is a salaried employee of Adis International Ltd/Springer Nature and declares no relevant conflicts of interest. All authors contributed to the review and are responsible for the article content.

Ethics approval, Consent to participate, Consent to publish, Availability of data and material, Code availability Not applicable.

Additional information about this Adis Drug Review can be found here


Tofersen (Qalsody™) is an antisense oligonucleotide being developed by Biogen for the treatment of amyotrophic lateral sclerosis (ALS). On 25 April 2023, tofersen was approved in the USA for the treatment of ALS in adults who have a mutation in the superoxide dismutase 1 (SOD1) gene. This article summarizes the milestones in the development of tofersen leading to this first approval for ALS.

© Springer Nature Switzerland AG 2023


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