** Shares of cell therapy developer Arcellx rise 8% to $91.35 premarket
** Co says its cell therapy anito-cel showed 97% overall response rate in a mid-stage trial testing patients with multiple myeloma, a type of blood cancer
** Overall response rate is the proportion of patients who have a partial or complete response to the therapy
** If approved, anito-cel, developed in partnership with Gilead , will compete with Johnson & Johnson's cell therapy Carvykti
** Brokerage TD Cowen says anito-cel's efficacy remains at least as good as Carvykti, but with superior safety
** ACLX's therapy showed no delayed damage to the nervous system, but three deaths occurred due to adverse events during the trial
** Up to last close, stock up 52.3% YTD
(Reporting by Christy Santhosh)
((Christy.Santhosh@thomsonreuters.com))
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