** Shares of gene therapy developer Adaptimmune Therapeutics
ADAP.O fall ~6.7% to $1.18
** Co says its gene therapy Tecelra got U.S. FDA approval
for the treatment of a rare type of cancer called synovial
sarcoma
** The approval comes with a safety-related 'boxed warning'
for an inflammatory response
** Co says the treatment carries a list price of $727,000
** Brokerage Guggenheim says the price represents a premium
over recent cell therapies but is justified given the "ultra
rare" indication
** Stock up 48.8% YTD
(Reporting by Christy Santhosh)
((Christy.Santhosh@thomsonreuters.com))