MedImmune and Infinity Pharmaceuticals have entered into an agreement to jointly develop and commercialize novel small molecule cancer drugs targeting Heat Shock Protein 90 (Hsp90) and the Hedgehog cell-signaling pathway. In preclinical studies, Hsp90 and the Hedgehog pathway appear to be implicated in the growth and survival of a broad range of blood-related and solid tumor types. IPI-504, the most advanced of the drug candidates included in the agreement, is an Hsp90 inhibitor that has thus fa...