Healthcare stocks lead U.S. market lower

KEEPING SCORE: The S&P 500 fell 10 points, or 0.4%, to 2,645 as of 10 a.m. Eastern time. The Dow Jones industrial average lost 114 points, or 0.5%, to 24,486. The Nasdaq composite slid 18 points, or 0.3%, to 6,963. The Russell 2000 index of smaller-company stocks declined 8 points, or 0.5%, to 1,483.