By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- European stock markets trimmed earlier advances on Monday after a larger-than-expected drop in euro-zone inflation reignited deflation fears, adding more pressure on the European Central Bank to ease monetary policy at its meeting on Thursday.

The Stoxx Europe 600 index climbed 0.2% to 334.38, after trading as high as 335.94 ahead of the data.

The benchmark was lifted by a solid gain for Novartis AG (NVS), up 3% after the drug maker said it will close its trial of a heart-failure drug early because of the strength of the results so far.

Also pushing higher, ING Groep NV gained 2.9% after the Dutch bank said it will resume paying dividends in 2015.

More broadly, euro-zone consumer-price data were the main event in Europe on Monday. Inflation fell to 0.5% in the currency union in March, below analysts' expectations and marking the lowest level since late 2009. Economists worry the euro zone may be heading for deflation, which could put the region's fragile economic recovery at risk. This has raised calls for the ECB to either cut rates or launch new easing measures at its meeting on Thursday.

Meanwhile, the euro (EURUSD) has steadily increased against the dollar, recently touching its highest level since 2011. That has further added pressure on the ECB loosen policy.

ECB President Mario Draghi has consistently reassured listeners that the euro zone isn't heading for deflation, but that the central bank stands ready to act if needed. Howard Archer, chief U.K. and European economist at IHS Global Insight, called the inflation data "uncomfortable and unwelcome news for the ECB" and said the decision on Thursday will be a close call.

"However, the general impression we get from ECB officials' comments is that the they don't believe circumstances warrant policy action at this stage, and we still think it is more likely than not that the ECB will sit tight," he said.

Data out on Friday showed Spain fell into deflation in March, as high unemployment and weak demand for goods among households and businesses added pressure on consumer prices.

After the euro-zone-wide data on Monday, most major European stock indexes traded higher, although coming off their intraday highs. The U.K.'s FTSE 100 index gained 0.2% to 6,630.59, while Germany's DAX 30 index picked up 0.1% to 9,591.79. France's CAC 40 index was slightly lower at 4,410.52.

The German benchmark was also helped higher by a stronger-than-expected report on retail sales for February, while fourth-quarter economic growth in France was confirmed at 0.3%.

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