Enzon Pharmaceuticals, Inc. receives royalty revenues from existing licensing arrangements with other companies primarily related to sales of four marketed drug products: PegIntron, Sylatron, Macugen and CIMZIA. The Company has no clinical operations and limited corporate operations. PegIntron is used both as a monotherapy and in combination with REBETOL (ribavirin) capsules for the treatment of chronic hepatitis C. Macugen is used for the treatment of neovascular (wet) age-related macular degeneration. Sylatron is used for the treatment of melanoma. CIMZIA is used for the treatment of moderate to severe rheumatoid arthritis and Crohn's disease. CIMZIA is a biologic medicine that counteracts tumor necrosis factor (or TNF), which promotes inflammation of the joints in rheumatoid arthritis.