The article did mention drugs, specifically EPO which is used to increase VO2 Max. Steroids would be less useful in a runner since they add muscle mass and dragging any excess weight around a 26.2 mile course is counterproductive. The article mentioned that EPO could be behind either the recent world record times or the eventual sub 2-minute time.
Corticosteroids are used to improve recovery time and to help reduce pain and inflammation. They are routinely abused by cyclists, who are also endurance athletes who seek to minimize body mass.
