Spectrum Pharmaceuticals Inc. (SPPI) signed a deal with biopharmaceutical company Viropro Inc. (VPRO) to develop a biosimilar version of Swiss pharmaceutical giant Roche Holding AG's (RHHBY, ROG.VX) cancer drug rituximab ahead of its U.S. patent expiration in 2015.
The agreement comes as a wave of patent expirations looms over large pharmaceutical companies. Rituximab, used in the treatment of many lymphomas, leukemias, transplant rejection and some autoimmune disorders, saw worldwide sales of about $5.6 billion in 2009.



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