** GlaxoSmithKline's shares up 2 pct, 3rd-largestFTSE 100 gainer, having earlier been down as much as 1.5pct, after posting Q4 revenue and core EPS ahead of analystconsensus
** Q4 core EPS of 18.1p vs Reuters consensus 17.9p, revenueof 6.286 bln stg vs Reuters consensus of 6.256 bln stg
** Growing demand for new drugs helped to offset slide insales of its Advair medicine
** Shares also see spike in volumes after news (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)