**Shares of drug developer Sarepta Therapeutics SRPT.O 2.1% to $19.78 in early trading
** Co says U.S. FDA has approved the start of new study to test whether adding an extra immune-suppressing drug can make its gene therapy for Duchenne muscular dystrophy safer for patients who can no longer walk
** DMD is a rare genetic disorder that causes progressive muscle weakness and loss, mostly in boys and young men
** The early stage trial enrolls ~25 patients who can no longer walk, co says
** Patients will receive co's Elevidys gene therapy plus sirolimus to lower risk of serious liver complications - RNA
** The therapy is approved for children aged four and older who can walk, but not for those unable to walk due to safety concerns - RNA
** Including session's move, stock down ~85% YTD
(Reporting by Sahil Pandey in Bengaluru)
((Sahil.Pandey@thomsonreuters.com))
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