Early History and Focus
Sugen was founded in 1991 in Redwood City, California, by veteran biotech investor Stephen Evans-Freke and kinase researchers Joseph Schlessinger and Axel Ullrich. The name was derived from the initials of Schlessinger and Ullrich, and the "GEN" for Genetics. Sugen developed small-molecule inhibitors of protein kinases, key enzymes in signal transduction and cellular decision-making. The main focus was on oncology, though the company had collaborations in other therapeutic areas. The concept of inhibiting kinases by small molecules that mimicked the ATP structure was generally thought to be infeasible when the company was founded (due to the high (mM) concentration of ATP in cells), and Sugen has been credited with pioneering this area, leading to protein kinases being the second most active area of drug development, largely based on ATP-competitive inhibitors. Sugen also had research programs on protein phosphatases, none of which lead to therapeutics.
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