** Shares of drugmaker Xuanzhu Biopharmaceutical 2575.HK jump 18.1% to HK$37
** Set for the biggest one-day pct rise since Oct 22
** Stock also hit highest level since March 27 in the fifth session of gain
** Cambridge, Massachusetts-based oncology drugmaker Boston Oncology CGT Holding will license Xuanzhu's breast cancer treatment Bireociclib and lung cancer treatment Dirozalkib
** Payments to exceed $100 million if milestones are met
** Under agreement, Sihuan Pharmaceutical 0460.HK unit Xuanzhu is eligible to receive an upfront payment, regulatory and sales-related milestone payments, royalties based on sales
** YTD, Xuanzhu stock down 50.6%, while Sihuan Pharmaceutical shares up 15.5%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))