** Surface Oncology Inc's shares SURF.O rise 37.8% to
$1.01 - amongst biggest gainers across U.S. stock exchanges
premarket
** Drug developer said Coherus BioSciences Inc CHRS.O will
acquire the company to add two experimental immunotherapies to
CHRS portfolio
** The stock-for-stock deal is valued up to $65 mln - SURF
** The acquisition is approved by both the companies board
and expected to close in Q3
** SURF says it is also reducing its workforce by half
** Shares of CHRS down 3.7% to $5.19 premarket
** Up to Thursday's close, SURF's stock had fallen ~10% YTD
(Reporting by Khushi Mandowara in Bengaluru)
((Khushi.Mandowara@thomsonreuters.com;))