** U.S.-listed shares of drug developer XORTX Therapeutics
Inc XRTX.O rise 13.6% to $0.67 premarket
** Co says it has submitted an "orphan drug" status request
to U.S. FDA for its experimental kidney disease therapy
** The drug candidate, XRx-008, is being developed to treat
autosomal dominant polycystic kidney disease (ADPKD), XRTX
** ADPKD is characterized by expansion of fluid-filled cysts
in the kidneys
** The FDA awards "orphan drug" designation to drugs that
treat rare conditions and are protected through a series of
government incentives once they reach the market
** Stock fell ~62% over the past 12 months
(Reporting by Mariam E Sunny)
((Mariam.ESunny@thomsonreuters.com;))