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Second TNF Blocker Approved for Refractory UC

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New Option, Could Be Better

It is good news for patients who have ulcerative colitis and the health care providers who take care of them that a second anti-TNF agent is now available. The FDA’s approval of Humira (adalimumab) for moderate to severe ulcer-ative colitis provides us with an additional option that we definitely need because there are many patients who suffer from ulcerative colitis and fail to respond to the "conventional" treatments with aminosalicylates or steroids and thiopurines, or lose response to infliximab. Adalimumab is an option for many of these types of patients and may be the first choice anti–tumor necrosis factor agent for some patients or providers, due to the injectable delivery method for this therapy.

Despite this good news, however, we need to acknowledge that 8-week remission rates of 18.5% and 16.5% leave a lot of room for improvement. Future studies with adalimumab in ulcerative colitis will focus on how to optimize this therapy and will explore adjustable dosing schedules, combination therapies, and other important longer-term outcomes such as sustained remission and mucosal healing.

David T. Rubin, M.D., AGAF, is a professor of medicine and co-director of the Inflammatory Bowel Disease Center at the University of Chicago. He has served as a consultant for Janssen and for Abbott.


 

Adalimumab, a subcutaneously administered tumor necrosis factor blocker, has been approved for treating adults with moderately to severely active ulcerative colitis who have not had an adequate response with conventional treatments, the Food and Drug Administration announced.

The safety and effectiveness of adalimumab for this patient population was established in two clinical studies of 908 patients with moderately to severely active ulcerative colitis (UC).

Adalimumab, marketed as Humira by Abbott Laboratories, was first approved for treating rheumatoid arthritis in 2002, followed by psoriatic arthritis in 2005, ankylosing spondylitis in 2006, Crohn’s disease in 2007, and plaque psoriasis and juvenile idiopathic arthritis in 2008.

Adalimumab is the second TNF blocker to be approved for ulcerative colitis; infliximab (Remicade), an intravenous TNF blocker, was previously approved for treating ulcerative colitis.

Clinical remission rates in the two studies were significantly greater among patients treated with infliximab than among those who received placebo: In an 8-week study, which did not include patients who had previously been treated with a TNF blocker, the clinical remission rate at 8 weeks was 18.5% among those on adalimumab vs. 9.2% in those on placebo, a 9.3% difference.

In the second study, which followed patients for 1 year and included some who had been treated with infliximab, the clinical remission rate at 8 weeks was 16.5% among those on adalimumab, vs. 9.3% among those on placebo, a 7.2% difference.

At a meeting on Aug. 28 held to review these data, the majority of the FDA’s Gastrointestinal Drugs Advisory Committee agreed that these differences represented clinically meaningful benefits and supported approval of adalimumab for this indication – adults with moderately to severely active ulcerative colitis who have not had an adequate response to conventional treatment.

Panelists cited the need for more treatments for ulcerative colitis and for a subcutaneous TNF blocker for these patients, as well as its potential steroid-sparing effects.

In the studies, no new side effects were identified, the agency said.

The FDA statement points out that the effectiveness of adalimumab "has not been established in patients with ulcerative colitis who have lost response to or were intolerant to TNF blockers."

The approved dosing regimen for adalimumab is a starting dose of 160 mg, followed by a second dose of 80 mg 2 weeks later and then a maintenance dose of 40 mg every other week.

"The drug should only continue to be used in patients who have shown evidence of clinical remission by 8 weeks of therapy," according to the FDA statement.

Adalimumab is the first self-administered biologic treatment for ulcerative colitis to be approved.

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