Harold Varmus, who has run Memorial Sloan-Kettering Cancer Center for the past decade, has asked Sloan-Kettering's board to start looking for his successor. "I came here with the intention of doing this job for about 10 years, and 10 years have passed," Varmus told the Wall Street Journal Health Blog. Varmus is going to keep running a lab and teaching, and said he will stay on until his replacement has been recruited.