** Shares of drug developer Magenta Therapeutics Inc
MGTA.O surge ~55% to 87 cents, after the bell
** Stock among top gainers across U.S. exchanges
** Co said it will explore strategic alternatives and stop
further development of its programs
** Strategic options may include an acquisition, merger,
business combination or other transaction - MGTA
** Last week, co paused dosing in its early-to-mid stage
study of blood cancer therapy MGTA-117, after a participant
experienced respiratory failure and cardiac arrest resulting in
death
** Stock lost 91% in 2022
(Reporting by Sriparna Roy)
((Sriparna.Roy@thomsonreuters.com;))