** Shares of GenScript Biotech Corp 1548.HK jump 7.3% to HK$16.5, their highest since June 16, and set for fifth consecutive session of gains
** Stock on track for biggest one-day pct rise since June 9
** Hong Kong-listed GenScript said its associate Legend Biotech LEGN.O announced that its cancer treatment drug Carvykti generated about $439 mln in net sales for the quarter ended June
** Legend's partner Johnson & Johnson JNJ.N reports Q2 sales of blood cancer cell therapy Carvykti of $439 mln vs consensus estimates of $419 mln, says the increase is driven by factors including capacity expansion
** YTD, GenScript stock up 66.3%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))