Bristol-Myers Squibb Co. said Friday that it has won U.S. approval to sell a new type of drug for treating the painful swelling of rheumatoid arthritis.
Sales of the new medicine, called Orencia, may top $1 billion a year, some industry analysts have predicted.
Rheumatoid arthritis occurs when the body's immune system attacks the joints. An estimated 2 million Americans have the disease.
Orencia is the first approved drug known as a T-cell co-stimulation modulator. It helps relieve joint pain by inhibiting activation of T-cells, components of the immune system involved in inflammation.
The drug, known generically as abatacept, is administered by monthly intravenous infusion.
Orencia was approved for treating moderate to severe cases of rheumatoid arthritis that do not respond to one or more other therapies.
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Older treatments include Abbott Laboratories Inc.'s Humira, Johnson & Johnson's Remicade and Amgen Inc.'s Enbrel.
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Three Bristol-Myers studies showed more patients had a 20 percent improvement in disease symptoms if they took Orencia rather than a placebo. In one study, 61 percent of Orencia patients, compared with 35 percent of placebo patients, saw that level of benefit during six months of therapy.
Like the older drugs, Orencia was associated with a risk of infections. Serious infections occurred in 3 percent of patients treated with Orencia, compared with 1.9 percent who received a placebo.
Enbrel, Remicade and Humira are TNF-alpha inhibitors, which block a protein linked to inflammation.














