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Ionis Innovation

Our antisense-powered pipeline

Our drug discovery platform has served as a springboard for drug discovery and realized hope for patients with unmet needs. Our broad, diverse pipeline has more than 40 first-in-class and/or best-in-class medicines designed to treat a broad range of diseases including cancer and cardiovascular, neurological, infectious and pulmonary diseases.

The result of 30 years of perfecting and advancing RNA targeted drug discovery and development, our proprietary platform now provides a fast and efficient path from genomic discovery to life-saving therapies.


Amyotrophic Lateral Sclerosis

Chemistry: Generation 2+

ION363 is an investigational antisense medicine designed to reduce the production of the Fused in Sarcoma (FUS) protein.  ION363 is also known as Jacifusen (not an official USAN name) in honor of Jaci Hermsted, the first patient treated with the drug under an expanded access program. It is in development for patients with a rare genetic form of amyotrophic lateral sclerosis (ALS) caused by mutations in the FUS gene3. Mutant FUS causes motor neuron degeneration through a toxic gain of function mechanism2. In patients, mutant FUS protein aggregates in motor neurons4. Antisense-mediated reduction of mutant FUS protein in a FUS-ALS mouse model prevents motor neuron loss. It is hypothesized that reduction of FUS protein will reverse or prevent disease progression in FUS-ALS patients.

Amyotrophic Lateral Sclerosis

ALS is a rare, fatal neurodegenerative disorder characterized by loss and dysfunction of neurons in motor pathways. It is estimated that there are ~55,000 patients diagnosed with ALS in major markets1. Approximately 90 percent of patients with ALS have no known family history, while approximately 10 percent of patients have a known genetic cause for their disease. People with ALS suffer progressive degeneration of motor neurons, which results in a declining quality of life due to muscle weakness, loss of movement and difficulty in breathing and swallowing. Currently, treatment options for patients with ALS are extremely limited with no drugs that significantly slow disease progression.

Select Publications
  1. Mehta, P. et al. (2018) Prevalence of Amyotrophic Lateral Sclerosis — United States, 2014. MMWR Morb Mortal Wkly Rep. 67(7):216–218.
  2. Sharma, A. et al. (2016) ALS-associated mutant FUS induces selective motor neuron degeneration through toxic gain of function. Nat Commun. 7:10465.
  3. Da Cruz, S. et al. (2011) Understanding the role of TDP-43 and FUS/TLS in ALS and beyond. Curr Opin Neurobiol. 21:904-919.
  4. Mackenzie, I.R. et al. (2010) TDP-43 and FUS in amyotrophic lateral sclerosis and frontotemporal dementia. Lancet Neurol. 9:995-1007.

* Safety and efficacy have not been evaluated by any regulatory authorities for the indications described.


Future-creating, antisense medicines

Our antisense technology has allowed us to create treatments that disrupt the disease process, may change its course and, we hope make a positive difference in patients' lives.

Once in a lifetime breakthroughs again and again

Meet Chuck. Active throughout his life, hATTR, a rare disease, started to rob him of the things he loved: riding his bicycle, dancing, racing motorcycles, and picking up his grandchildren. Just about to give up, news of a clinical trial renewed his hope.