** Shares of companies developing Alzheimer's disease
treatments jump before the bell after Biogen BIIB.O and
Eisai's 4523.T treatment succeeds in a late-stage trial
** Prothena Corporation PLC PRTA.O jumps 38.6% to $42.88,
Acumen Pharmaceuticals ABOS.O rises 29.8% to $6.1 premarket
** The drug, lecanemab, slowed cognitive and functional
decline in a large trial of patients in the early stages of the
disease, marking a rare win in a field littered with failed
drugs urn:newsml:reuters.com:*:nL1N30Z0O8
** The data is an unequivocal win for both Alzheimer's
patients and Biogen, says BMO analyst Evan Seigerman
** These results should confirm any doubts that these drugs
have clinical effect, and we predict there could be multiple
drugs driving a multi-billion dollar class in the future -
Jefferies analyst Michael Yee
** Biogen's shares up 40%, while rival Eli Lilly LLY.N up
~8% at $335.60 premarket urn:newsml:reuters.com:*:nL4N30Z23S
** PRTA shares down ~27% YTD, while ABOS down 30.5%
(Reporting by Manas Mishra)
((Manas.Mishra@thomsonreuters.com;
www.twitter.com/Manaswrites15;))