** Shares of drug developer Acer Therapeutics Inc ACER.O
close ~10% down at $3.72
** Co receives U.S. FDA approval for its drug to treat the
genetic disorder called urea cycle disorders (UCD)
** On retail investor website Stocktwits.com, several
traders share they were "selling the news"
** Selling the news refers to a stock going down on positive
news as the news had long been predicted and priced in by the
market
** The same drives investors to buy the stock and wait for
the news to become public
** YTD, stock was up ~63%, as of last close
(Reporting by Anirban Chakroborti in Bengaluru)
((Anirban.Chakroborti@thomsonreuters.com;))