** Drug developer's shares AMPE.N down ~25 pct to 36 cents
premarket - set to touch record low if losses hold
** Stock among top pct losers premarket across U.S.
exchanges
** U.S. Food and Drug Administration asks for additional
study for co's lead drug Ampion urn:newsml:reuters.com:*:nPn3VkZB7a
** Ampion is an injectable drug being developed to treat
severe osteoarthritis of the knee
** Co to conduct additional trial of about 150 patients and
will submit data from the study in the near future
** Up to Wednesday's close, stock had fallen 88 pct YTD
(Reporting by Saumya Sibi Joseph in Bengaluru)
((Reuters Messaging:
saumya.joseph.thomsonreuters.com@reuters.net))