** Shares of medical aesthetics firm Sientra Inc SIEN.O
jump 76% to $3.1 before the bell
** Stock top pct. gainer across U.S. stock exchanges
premarket
** Co late Thursday reported that the U.S. FDA granted
marketing clearance for its breast tissue expander AlloX2 Pro
** A tissue expander is an empty implant used in
reconstruction surgeries
** SIEN adds that with the approval AlloX2 Pro becomes the
first MRI-compatible tissue expander available in the U.S.
market
** The nod for AlloX2 Pro makes it SIEN's third product
approved by the FDA in the past 12 months
** FDA last month granted marketing clearance for co's
Portfinder, an electronic handheld device that allows clinicians
to locate the right administration spot for tissue expansion
** Up to Thursday's close, stock fell 13.75% YTD
(Reporting by Pratik Jain in Bengaluru)
((Pratik.Jain@thomsonreuters.com;))