** Summit Therapeutics SMMT.O surges 35% premarket, while
Merck's MRK.N shares slide 3.6%
** Summit's ivonescimab therapy shows median of 11.14 months
of progression-free survival vs 5.82 months for Merck's Keytruda
in its late-stage lung cancer trial in China
** SMMT's experimental therapy reduces tumor progression
risk by 49%
** In May, SMMT said its therapy showed statistically
significant improvement compared to Merck's, sending its shares
soaring 177%
** "We could see some Merck weakness, but don't expect
Keytruda to be challenged anytime soon," BMO Capital Markets
says
** SMMT soars ~370% YTD vs MRK's ~8% gain, as of last close
(Reporting by Sriparna Roy in Bengaluru)
((Sriparna.Roy@thomsonreuters.com;))