Image source: Celgene Corporation.Celgene Corp (NASDAQ: CELG) launched Otezla in 2014 to diversify its revenue stream and by all measures, Celgene's first foray into autoimmune disease has been a success. Second quarter sales of Otezla clocked in at $242 million, up 170% from last year and 24% from Q1. Can Otezla's sales continue to head higher?Continue reading