SUMMIT, N.J.--(BUSINESS WIRE)--Celgene Corporation (NASDAQ: CELG) announced that updated results of a phase II, multi-center, randomized, double-blind, placebo-controlled, three-arm study of apremilast in adult patients with psoriatic arthritis (CC-10004-PSA-001) were presented today at the American College of Rheumatology (ACR) 2009 annual meeting in Philadelphia, PA.