** Shares of drug developer Minerva Neurosciences Inc
NERV.O plummet 68.4% to $4.25 premarket
** Set for worst day since May 2020 if losses hold; among
top pct. losers across U.S. exchanges
** NERV says U.S. FDA has sent it a "refusal to file"
letter, refusing to accept its application seeking approval for
its experimental therapy, roluperidone, targeting negative
symptoms of schizophrenia urn:newsml:reuters.com:*:nGNX4V1TS8
** Says it plans to request a meeting with the FDA to
discuss further
** NERV had submitted the application in August urn:newsml:reuters.com:*:nL4N2ZY2PD
** Stock had more than doubled YTD through last close
(Reporting by Ruhi Soni in Bengaluru)
((Ruhi.Soni@thomsonreuters.com
Twitter: https://twitter.com/ruhithere))