Not all drug companies are in pursuit of billion-dollar blockbuster drugs taken by millions of Americans. In fact, there are drugs treating rare conditions that wouldn't be sold on the market if not for a landmark piece of legislation known as the Orphan Drug Act, now 25 years old. Jeffrey Aronin, president and CEO of Ovation Pharmaceuticals Inc. tells the Chicago Tribune's Bruce Japsen about the silver anniversary of the Orphan Drug Act, its benefits and its future potential.