(Updates with U.S. listed shares)
** Shares of Belgian biotech company Argenx ARGX.BR closed
3.5% higher at 485.10 euros, on Wednesday
** Stock topped Belgium's blue-chip BEL 20 index .BFX
** Analysts at brokerage KBC Securities say company's drug
Vyvgart is still the top contender, despite a positive trial
data from a competitor
** U.S.-listed shares of Argenx ARGX.O rose 4.6% to
$543.57 during the trading hours
** Amgen AMGN.O , late on Tuesday, reported favourable
late-stage data for its drug Uplizna to treat patients with a
rare muscle-weakening disease called myasthenia gravis
** "We deem the Uplizna dataset to be strong yet somewhat
less compelling than Vyvgart" - KBC
** "Vyvgart has shown strong effects already at week 4, and
thereby oversteps the efficacy of Uplizna at week 26" -
brokerage
** Up to day's close, stock gained 41.2% YTD
(Reporting by Dimitri Rhodes and Puyaan Singh)
((Dimitri.Rhodes@thomsonreuters.com))