Enzon Inc. (NASDAQ:ENZN) of South Plainfield, N.J., said it filed aU.S. patent application to register the trademark "ONCASPAR"for its PEG-L-asparaginase drug, which is under FDA review.ONCASPAR is used to treat patients with acute lymphoblasticleukemia who are hypersensitive or allergic to the unmodifiedform of L-asparaginase.

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