LONDON (TheDeal) -- European stocks were mixed to lower on Thursday as the U.K. left its first-quarter GDP growth estimate unchanged and worries over Greece continued ahead of next week's loan payment deadline.

In London, the FTSE 100 was little changed at 7,033.39, while in Frankfurt, the DAX was 0.38% lower at 11,726.88. In Paris, the CAC 40 retreated 0.64% at 5,149.16.

In the U.K., the Office of National Statistics said that GDP in volume terms rose by 0.3% in the first quarter, reiterating the estimate published at the end of April.

Meanwhile, jitters over Greece continue to rattle stock and bond markets on the second day of the G7 meeting in Dresden, Germany, where arriving officials were quick to rebuff Athens' boast of an imminent deal with international creditors.

In a Thursday note, Mizuho Securities bond market strategist Peter Chatwell predicted that market uncertainty will continue "until we know the full content of the Greek draft [accord], and are thus able to assess whether it will meet the requirements of its creditors."

On a brighter note, strong corporate results pushed several stocks higher across the region.

Leading Londong gainers, retailer Sports Direct International (SDISY) added 5% after saying that earnings per share beat expectations, crediting its continued and "prudent" depreciation policy and lower interest rate charges.

Home improvement retailer Kingfisher (KGFHY) was also up, adding 3% after posting first-quarter results largely in line with expectations, and sealing agreements with two national retailers to sell leases on do-it-yourself and gardening stores slated for closure. In March, the company announced plans to shut around 60 locations.

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