By Kate Gibson, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks mostly fell on Tuesday, slicing April gains, as investors took in more economic data that including one illustrating contraction in Chicago-area manufacturing.

But several analysts cited the market's lofty levels as part of the equation.

"We're coming off a peak," said Alan Skrainka, chief investment officer at Cornerstone Wealth Management in Des Peres, Mo., who chalked up the day's drop to the "normal ebb and flow" of the equities market.

"There's some technical resistance right at the high," Randy Frederick, managing director of active trading and derivatives at the Schwab Center for Financial Research, said of the 1,593.61 close, a record, by the S&P 500 (SPX) on Monday.

On Tuesday, the S&P 500 index was down 1 point at 1,592.64, with health-care companies driving losses and technology the best performing of its 10 major industry sectors.

Up 1.5% for April, a positive finish for a sixth straight month would mark the index's longest winning run since a seven-month stretch that ended in September 2009.

The Dow Jones Industrial Average (DJI) lost 27.15 points to 14,79160, with 15 of its 30 components in the red, led by Pfizer Inc. (PFE), down 3.3% after the drug manufacturer cut its 2013 profit outlook and reported first-quarter earnings that missed Wall Street estimates.

The Nasdaq Composite (RIXF) rose 6.16 points to 3,313.17.

Helping the Nasdaq higher, Apple Inc. (AAPL) shares gained 1.8% after the iPhone maker detailed a six-part bond offering in a regulatory filing on Tuesday. Read story about potential impact on the bond market.

Advancers pulled just ahead of decliners on the New York Stock Exchange, where 196 million shares traded as of 11:15 a.m. Eastern.

Composite volume surpassed 1.1 billion.

Among the day's economic reports, the S&P/Case-Shiller home-price index rose 0.3% in February, and 9.3% year-over-year, while a gauge of manufacturing in the Chicago area slid to a more-than three-year low in April and the Conference Board's consumer-confidence index jumped sharply in April.

The Federal Open Market Committee will begin its two-day meeting on monetary policy on Tuesday, with a decision slated for Wednesday. With inflation below the Fed's 2% target, and data last week showing the U.S. economy growing less than expected in the first quarter, the FOMC is expected to keep its bond-buying program at $85 billion a month.

On Thursday, the European Central Bank could trim its benchmark interest rate.

Aetna Inc. (AET) shares rose 3.2% after the health insurer reported Tuesday a slight drop in first-quarter earnings but raised its full-year operating earnings estimate.

Best Buy Co. (BBY) shares rallied 9.9% after the electronics retailer said it would sell its 50% stake in Carphone Warehouse Group's European business to Carphone Warehouse.

Pitney Bowes Inc. (PBI) retreated 17% after releasing first-quarter results and cutting its dividend.

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