** Shares of Antengene Corp 6996.HK rise 5.6% to HK$5.84
** Stock at highest level since Feb 2023, set for sixth consecutive session of gains
** Innovative oncology medicines-focused clinical-stage biopharmaceutical group says its Xpovio approved in China for second-line treatment of multiple myeloma
** Hang Seng Biotech Index .HSHKBIO rises 2.6%, while benchmark Hang Seng Index .HSI falls 1.1%
** YTD, stock up 783%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))