LONDON--GlaxoSmithKline PLC (GSK) said it started a late-stage trial of retosiban, a drug that could potentially be used to improve the prospects for babies that are born before term.

The phase three program will seek to measure whether the treatment delays the onset of a baby's delivery and whether it improves the mortality rate. A follow-up study will assess the long-term consequences for infants.

Shares at 1110 GMT traded seven pence or 0.4% higher at 1,584 pence.

Write to Ed Ballard at ed.ballard@wsj.com

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