Biopharmaceutical firm Celgene ( CELG) is enjoying some stellar performance in 2013. Shares of the $50 billion name have rallied more than 53% since the calendar flipped over to 2013. A lot of the firm's success can be traced to the success of its cancer and immunology drugs. Offerings such as Revlimid, Thalomid and Vidaza combined with prospects such as now-approved Pomalyst are getting investors excited. >>3 Health Care Stocks Under $10 to Watch Celgene's pipeline looks strong, despite a lack of diversity in the diseases that the legacy firm's drugs treat. As CELG's researchers come up with new indications for existing therapies, the firm should be able to generate material increases in sales. Growth by acquisition has been a major strategy for management in recent years, adding Abraxis BioScience and Pharmion under the firm's umbrella -- and all of their intellectual property and research capabilities along with it. From a financial standpoint, Celgene has plenty of dry powder to keep up its strategy. Its $3.5 billion cash position more than offsets a $3 billion debt load, and the firm's true cash generation power is masked by the fact that its $2 billion in annual free cash flow generation has been offset by major investments in recent years. Now the firm has a chance to return extra value to shareholders in 2013. Funds picked up 4.85 million shares of Celgene in the most recent quarter.