** Shares of drug developer Cogent Biosciences COGT.O rise 19.4% to $9.05 premarket
** Co says its drug, bezuclastinib, showed a statistically significant reduction in symptoms in patients with mastocytosis, a type of blood disorder
** Mastocytosis is a disease where the body makes too many of a type of white blood cell called mast cells, which build up in places like the bone marrow, skin or organs
** COGT expects to file a marketing application for the treatment by the end of 2025
** Up to last close, stock down 2.8% YTD
(Reporting by Christy Santhosh)
((Christy.Santhosh@thomsonreuters.com))