March 8, 2010 (Miami Beach, Fla.) -- If the drug Enbrel stops working, people with psoriasis have two effective options, new research suggests.
Although Enbrel works for many people with psoriasis, one new study shows that the recently approved drug Stelara can help treat moderate to severe psoriasis if Enbrel fails.
A second study suggests Remicade is effective for people with psoriasis who are no longer helped by Enbrel.
The findings were presented at the annual meeting of the American Academy of Dermatology. Both studies were sponsored by Centocor, which makes Stelara and Remicade.
About 7.5 million Americans suffer from psoriasis, a lifelong disorder characterized by inflammation of skin and, often, the joints.
Stelara, Remicade, and Enbrel are all biologics -- drugs made of genetically engineered proteins -- that are generally used to treat patients who aren't responding to traditional therapies such as light therapy and methotrexate.
Remicade and Enbrel both block tumor necrosis factor-alpha (TNF-alpha), a chemical produced by immune cells that fuels inflammation, much like gas on a fire. Stelara targets two proteins, interleukin 12 and interleukin 23, that also drive the inflammatory process.
The new findings show that if Enbrel stops working, "there are other effective options," says Alan Menter, MD, chair of the psoriasis research unit at Baylor Research Institute in Dallas.
Menter was an investigator in the Stelara study, a follow-up analysis of a larger trial of more than 900 patients that showed Stelara was more effective than Enbrel in the treatment of moderate-to-severe plaque psoriasis.
The new analysis focused on 50 patients who continued to have moderate-to-severe psoriasis after 12 weeks of Enbrel therapy. Compared with people who were helped by Enbrel, they tended to be heavier, male, and have more severe psoriasis.
All were given Stelara injections four weeks and eight weeks later.
Three months later, 40% had, at most, minimal signs of their psoriasis; 70% had mild disease at most.
The second study involved 217 psoriasis patients who had significant disease despite ongoing treatment with Enbrel. All were switched to Remicade therapy.
"While both drugs block TNF-alpha, they do so in slightly different ways. There are subtle difference that made us think that Remicade may work more effectively," says Robert Kalb, MD, a clinical professor of dermatology at the State University of New York, Buffalo, who was involved in the trial.