In a large trial led by a Stanford investigator, an experimental drug produced clinically meaningful improvements for rheumatoid arthritis patients unresponsive to existing treatments.
Rheumatoid arthritis patients getting little or no relief from conventional small-molecule drugs and injectable biologic drugs saw substantial improvement in their condition from daily use of an experimental compound in a large 24-week study led by a Stanford University School of Medicine investigator
A paper describing the results of the double-blind, randomized phase-3 clinical trial was published July 23 in JAMA.
“For patients who haven’t done well on other therapies, these findings are cause for optimism, enthusiasm and hope,” said Mark Genovese, MD, professor of immunology and rheumatology and principal investigator of the study.
Stanford Health Care offers services to rheumatoid arthritis patients through its immunology and rheumatology clinic. As clinical chief, Genovese spends three half-days per week in the clinic, where he regularly sees and treats rheumatoid arthritis patients.
He is the paper’s lead author. The senior author is Tsutomu Takeuchi, MD, PhD, professor of rheumatology and clinical immunology at Keio University School of Medicine in Tokyo, Japan.
Rheumatoid arthritis is a progressive, systemic autoimmune disease affecting at least 1 in every 100 people worldwide. For reasons that aren’t understood, 3 of every 4 people with the disorder are women. While its most visible hallmarks are pain, stiffness, inflammation and eventual deterioration of joints, patients also are at heightened risk for cardiovascular disease and other inflammatory complications.
In clinical trials, about 70% of rheumatoid arthritis patients have appeared to benefit initially from small-molecule therapies in a pill form, such as methotrexate, said Genovese, who is the James W. Raitt M.D. Professor. However, “in the real world, adherence to any of them is more like 50%,” he said. Patients for whom the conventional small-molecule drugs fail are switched to pricey, injectable, bioengineered-protein drugs, including three of the world’s top-15 biggest-selling drugs in dollar sales. But these drugs, too, fail among about half the rheumatoid arthritis patients who use them, Genovese said.
Selective JAK-1 inhibitor
The experimental compound, filgotinib, is a selective JAK-1 inhibitor. It works by preferentially blocking 1 of a set of 4 closely related enzymes required for certain inflammatory signaling processes within cells. Two other compounds that are similar in mechanism of action to filgotinib but that impede JAK enzyme family members less selectively are licensed in the United States for use by rheumatoid arthritis patients, but only at low doses or with warning labels due to side effects.
This novel drug works exceptionally well in patients who’ve already failed traditional therapies for rheumatoid arthritis.
The trial was conducted in 114 centers in 15 countries, mostly in North America and Europe. The 449 participants averaged 56 years of age, and about 80% of them were female. They were randomized to 1 of 3 study arms, in which they received daily doses of either 200 milligrams of filgotinib, 100 milligrams of filgotinib or a placebo for 24 weeks. All participants had moderately to severely active rheumatoid arthritis despite treatment with one or more biologic therapies.
The primary goal of the study was to observe whether there was an improvement at 12 weeks into the trial of at least 20% on a measure of joint swelling and tenderness called the ACR20 that was established by the American College of Rheumatology. An important secondary outcome was a score indicating low disease activity in 28 predetermined joints on a test called the DAS28-CRP.
Compared with the placebo group, a significantly greater proportion of participants on both the high- and low-dose filgotinib regimens achieved the primary endpoint: a 20% improvement in symptoms as measured by the ACR20. Sixty-six percent of participants on 200 milligrams of filgotinib, and 57.5% of those on 100 milligrams, fulfilled this criterion, versus only 31.1% of those on placebo.
Of equal or even greater importance, Genovese said, was the participants’ improvement on the DAS28-CRP at both 12 and 24 weeks. By 12 weeks, 40.8% of those on the 200 milligram dose of filgotinib and 37.3% of those on 100 milligrams had reached the status of low disease activity as measured by the DAS28-CRP, as opposed to only 15.5% of those on the placebo regimen. These outcomes continued or improved over the course of the trial. By 24 weeks, 48.3% of the high-dose filgotinib recipients and 37.9% of those on the low dose had reached low-disease-activity status.
By week 12 of the trial, 22.4% of high-dose and 25.5% of low-dose filgotinib recipients, but only 8.1% of placebo recipients, had DAS28-CRP scores indicating outright remission. By week 24, high-dose recipients had a remission rate of 30.6%; low-dose recipients, 26.1%; and placebo recipients, 12.2%.
Improvement seen early on
The drug’s benefits to participants became apparent soon after the trial’s onset. “We could see improvements as early as two weeks into the trial,” Genovese said.
Also telling was a substantial difference among the study arms in how many participants completed the 24-week trial. Of the 148 participants in the placebo arm, 51 dropped out before completion. Only 20 of the 148 high-dose recipients and 34 of the 153 low-dose recipients dropped out.
Investigators’ early concerns about increased susceptibility to infections, or the re-emergence of active forms of prior infections, such as tuberculosis or shingles, were assuaged by the relative smattering of such adverse events, compared with placebo.
Notably, patients for whom at least three different biologic therapies provided insufficient relief did as well in this trial as those who’d derived insufficient relief from just one biologic therapy, Genovese said. “We found that those high levels of response were independent of how many drugs you’d failed, and independent of which drugs you’d failed,” he said.
Overall response rates to filgotinib appear to surpass those of the other commercially available JAK inhibitors at doses approved for use in the United States, he said.
“This novel drug works exceptionally well in patients who’ve already failed traditional therapies for rheumatoid arthritis,” he said.
The Latest on: Rheumatoid arthritis
via Google News
The Latest on: Rheumatoid arthritis
- A community powered walkathon to create awareness on arthritis witnessed a huge participationon February 24, 2020 at 1:08 am
“Being diagnosed with rheumatoid arthritis at the age of 15 was a daunting experience, but one that was made more manageable with a fantastic support network and the right treatment plan. As I learnt ...
- 6 Tips for Hosting Family Events If You Live with Rheumatoid Arthritison February 21, 2020 at 1:14 pm
We hosted Hanukkah last year and Thanksgiving this year. It’s a lot of fun, but also a lot of work. Since I have rheumatoid arthritis (RA), I know I shouldn’t exert myself too much or I’ll end up in ...
- The outcomes of bariatric surgery on rheumatoid arthritis disease activity: a prospective cohort studyon February 21, 2020 at 2:14 am
Rheumatoid arthritis (RA) is a chronic inflammatory autoimmune disease that primarily affects the joints. Overweight and obesity can aggravate disease activity and clinical outcome in patients with RA ...
- What is seronegative rheumatoid arthritis?on February 20, 2020 at 6:46 pm
Rheumatoid arthritis (RA) is an autoimmune condition and type of inflammatory arthritis. It causes pain, swelling, and stiffness in the joints. There are several different types, including ...
- Local transplantation of adipose-derived stem cells has a significant therapeutic effect in a mouse model of rheumatoid arthritison February 20, 2020 at 4:01 am
Rheumatoid arthritis (RA) is an autoimmune disease characterized by synovial inflammation and degeneration of articular cartilage and bone. In previous decades, systemic therapies, including ...
- Study Probes Side Effects of Methotrexate, Used for Psoriasis, Rheumatoid Arthritison February 18, 2020 at 9:43 am
Study Probes Side Effects of Methotrexate, Used for Psoriasis, Rheumatoid Arthritis TUESDAY, Feb. 18, 2020 (HealthDay News) -- Many Americans battling autoimmune illnesses such as rheumatoid arthritis ...
- Early Signs of Arthritis You Should Never Ignoreon February 18, 2020 at 9:22 am
Inflammatory arthritis is a systemic disease in which the mechanisms that normally protect your body attack your own joints and tissues instead. The most well-known example is rheumatoid arthritis (RA ...
- Arthritis Foundation Releases Findings From One of the Nation's Largest Assessments of People With Arthritison February 18, 2020 at 7:15 am
/PRNewswire/ -- As the leading organization dedicated to changing the lives of the more than 54 million people living with arthritis in the U.S., the ...
- Study investigates rates of adverse events for common rheumatoid arthritis drugon February 17, 2020 at 2:06 pm
Today it is the most commonly used drug for systemic rheumatic diseases worldwide and is the first drug a physician will prescribe for a patient with rheumatoid arthritis. But despite its use by ...
- New Rheumatoid Arthritis Treatments and Studies: The Latest Researchon February 17, 2020 at 11:25 am
Rheumatoid arthritis (RA) is a chronic condition that causes joint swelling, stiffness, and pain. There’s no known cure for RA — but there are treatments available to help relieve symptoms, limit ...
via Bing News