BERKELEY, Calif. & WASHINGTON--(BUSINESS WIRE)--Joseph Schlessinger, Ph.D., co-founder and chairman of the board of Plexxikon, and professor and chair of the Department of Pharmacology at Yale University School of Medicine, has been awarded the 2010 Pezcoller Foundation-AACR International Award for Cancer Research. The prize was given to Dr. Schlessinger for his work in elucidating the mechanism of action of receptor tyrosine kinases and their intracellular signaling pathways.