** Shares of Acer Therapeutics Inc ACER.O gain 5.4% to
$1.56
** Co and its partner Relief Therapeutics Holding SA
RLFB.S say European Commission grants 'orphan drug'
designation to its experimental drug ACER-001 for treating maple
syrup urine disease (MSUD) urn:newsml:reuters.com:*:nGNX9BKS5F
** MSUD is a rare genetic disorder that occurs when the body
cannot breakdown certain parts of proteins
** Benefits of the orphan drug tag include potential for up
to 10-year EU market exclusivity upon regulatory approval of the
therapy
** Including session's gain, stock down ~32% this year
(Reporting by Raghav Mahobe)
((Raghav.Mahobe@thomsonreuters.com;))