By Chelsey Dulaney 
 

Eli Lilly (LLY) and Co. and Incyte Corp. (INCY) said Monday that a late-stage study of an experimental rheumatoid arthritis treatment showed improvement over a placebo and met its primary endpoint.

The companies said patients taking the drug, baricitinib, showed a statistically signficant improvement compared to those taking a placebo in the second-consecutive Phase 3 trial. The trial, part of an extensive Phase 3 program to test the drug in more than 3,000 patients, included 684 patients who had showed inadequate responses to conventional drugs.

The companies announced similar results in December from the first Phase 3 trial.

Rheumatoid arthritis is an autoimmune disease characterized by inflammation and progressive destruction of joints.

Lilly and Incyte struck a world-wide license and collaboration agreement for baricitinib in 2009. In addition to arthritis studies, the drug is also being tested for the treatment of psoriasis and diabetic nephropathy.

Write to Chelsey Dulaney at chelsey.dulaney@wsj.com

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