Man Obsessed, A by Alan E. Nourse (1928 - 1992)

Jeffrey Meyer had a killing on his mind. It meant nothing to him that his towering Twenty-first Century world was going mad. He shouldered aside the rising tide of narcotics-mania, the gambling fever, the insatiable lust for the irrational. Jeff had his own all-consuming obsession—Paul Conroe must die!
After a five-year frenzied chase, Jeff had his victim cornered; he'd driven him into the last hideaway of the world's most desperate men—the sealed vaults of the human-vivisectionists. And Jeff knew that to reach his final horrible objective, he must offer himself also as a guinea pig for the secret experiments of the world's most feared physicians! (Summary from original text)