Revenues

Royalty Revenue

Revenues received from the Company’s royalty products for the three months ended March 31, 2011 were $11.8 million, as compared to $12.9 million for the three months ended March 31, 2010. Royalties on PEGINTRON, marketed by Merck & Co., Inc., continue to comprise the majority of the Company’s royalty revenue and a reported decline in sales of PEGINTRON accounted for essentially all of the decrease in royalty revenue.

Sale of In-process Research and Development (IPR&D)

During the first quarter of 2011, the Company received a $5.0 million milestone payment from the purchaser of the specialty pharmaceutical business resulting from the approval of an sBLA for the manufacture of Oncaspar.

The Company recorded revenue of $40.9 million in the three-month period ended March 31, 2010 related to the sale of in-process research and development.

General and Administrative

General and administrative expenses decreased approximately 49 percent to $5.1 million for the three months ended March 31, 2011, as compared to $9.9 million for the three months ended March 31, 2010. The decrease is due in large part to management’s efforts to contain costs and to reduce the overhead necessary to support the current size and structure of the Company. Also, the first-quarter 2010 expenses included a noncash expense of $2.4 million related to the acceleration of stock expense associated with the sale of the specialty pharmaceutical business and the resignation of the Company’s former CEO. The Company continues to identify and implement efficiencies to reduce ongoing general and administrative expenses. Meanwhile, the effects of the fourth-quarter 2010 restructuring and the first-quarter 2011 consolidation of facilities at the Company’s Piscataway location are expected to generate further savings over the remainder of 2011.

Contracted Services

As part of the specialty pharmaceutical sale, Enzon agreed to continue to assist in the development of the next-generation Adagen and Oncaspar programs on a contracted basis. In addition, Enzon agreed to perform ongoing general, administrative, and selling services as requested by the purchaser. The transition service agreement supporting these activities provides for Enzon to be reimbursed at a cost plus an additional mark-up for all expenses incurred. The level of these activities has diminished substantially over the period subsequent to the sale of the specialty pharmaceutical business and should decline significantly from 2010 levels throughout the remainder of 2011.

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