Please ensure Javascript is enabled for purposes of website accessibility

Here's Why Ionis Pharmaceuticals Stock Got Slammed Today

By Brian Orelli, PhD - Updated Mar 23, 2021 at 6:26PM

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More

The biotech's partner is stopping a late-stage clinical trial for a Huntington's disease treatment.

What happened

Shares of Ionis Pharmaceuticals (IONS 1.44%) closed down 21.7% on Tuesday after the biotech's partner Roche Holding (RHHBY 0.93%) announced plans to stop treating patients with tominersen in a late-stage clinical trial testing the duo's drug to treat Huntington's disease, a progressive brain disorder.

So what

After taking an interim peek at the data from the study, the independent data-monitoring committee recommended patients stop receiving the drug due to the benefit/risk profile of tominersen. The companies noted there were no new or emerging safety signals identified in the patients taking tominersen, which implies the problem likely has to do with lower-than-expected efficacy.

Roche plans to follow the patients in the study, without giving them additional doses of tominersen or a placebo, but investors should assume there's a very, very small chance the final data might show a positive effect given the recommendation of the independent data monitoring committee.

Doctor talking to a patient in an exam room

Image source: Getty Images.

The companies also paused dosing in the extension study in which patients who were in the late-stage study could continue receiving tominersen or be switched to the drug if they were in the placebo group.

Shares of Wave Life Sciences (WVE 1.63%), which is testing multiple Huntington's disease drugs in early-stage development, fell 21% on Tuesday as investors worried about the ability to treat the disease.

Now what

Without a doubt, stopping dosing of tominersen is bad news for Ionis. Huntington's disease is an unmet need with huge potential if a company can find a drug to treat the genetic disease.

But Ionis has a well-stocked pipeline of drugs, including five other drug programs in phase 3 development, and 25 phase 2 clinical trials testing various drugs for different diseases. Some of them will likely follow the fate of tominersen -- drug development isn't perfect, after all -- but Ionis still has enough shots on goal to make it a biotech worth holding.

Invest Smarter with The Motley Fool

Join Over 1 Million Premium Members Receiving…

  • New Stock Picks Each Month
  • Detailed Analysis of Companies
  • Model Portfolios
  • Live Streaming During Market Hours
  • And Much More
Get Started Now

Stocks Mentioned

Ionis Pharmaceuticals, Inc. Stock Quote
Ionis Pharmaceuticals, Inc.
$36.60 (1.44%) $0.52
Roche Holding AG Stock Quote
Roche Holding AG
$40.12 (0.93%) $0.37
Wave Life Sciences Ltd. Stock Quote
Wave Life Sciences Ltd.
$1.25 (1.63%) $0.02

*Average returns of all recommendations since inception. Cost basis and return based on previous market day close.

Related Articles

Motley Fool Returns

Motley Fool Stock Advisor

Market-beating stocks from our award-winning service.

Stock Advisor Returns
S&P 500 Returns

Calculated by average return of all stock recommendations since inception of the Stock Advisor service in February of 2002. Returns as of 05/16/2022.

Discounted offers are only available to new members. Stock Advisor list price is $199 per year.

Premium Investing Services

Invest better with The Motley Fool. Get stock recommendations, portfolio guidance, and more from The Motley Fool's premium services.