Despite robust, sustained reductions in poly(GP), no clinical benefit was seen at 24 weeks, and reductions in poly(GP) were not associated with stabilization in functional outcomes. Based on these data, Wave decided to stop development of WVE-004.

This is an OLE study conducted to evaluate the safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and clinical effects of WVE-004 in adult patients with ALS, FTD, or mixed ALS/FTD phenotype with a documented mutation in the C9orf72 gene. To participate in the study, patients must have successfully completed Phase 1b/2a WVE-004-001 study.

Inclusion Criteria:

• Patient successfully completed the Phase 1b/2a study with WVE-004, WVE-004-001.

Exclusion Criteria:

• Patient has a clinically significant medical finding on the physical examination other than C9orf72-associated ALS or FTD that, in the judgment of the Investigator or Sponsor, will make the patient unsuitable for participation in and/or completion of the trial procedures.
• Patient received any other investigational drug, biological agent, or device within 1 month or 5 half-lives of study agent, whichever is longer. Patient received an investigational oligonucleotide within the past 6 months or 5 half-lives of the drug, whichever is longer.