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Two pharmaceutical companies have halted clinical trials of gene-targeting therapies for Huntington’s disease (HD), following the drugs’ disappointing performance.

Researchers had hoped that the treatments — known as antisense oligonucleotides (ASOs) — would be a game changer for HD, an incurable genetic condition that affects cognition, behaviour and movement. But back-to-back announcements from Roche, headquartered in Basel, Switzerland, and Wave Life Sciences, in Cambridge, Massachusetts, have dealt a crushing blow to those affected by the disease.

“I was really shocked, really tearful,” says Marion, a woman in London with HD, who was part of one of the trials. “We didn’t see it coming at all. I felt really frightened and worried about my future.” Marion requested that her last name be withheld to protect her privacy.

In mid-March, Roche announced that it was halting a phase III study of its ASO drug, tominersen. A week later, Wave Life Sciences said that it would discontinue the development of two of its HD ASOs that were in phase I/II clinical trials.

“The Roche trial in particular left the community quite devastated,” says...