** Shares of drugmaker Blueprint Medicines Corp BPMC.O
fall 5.8% to $41.73 premarket
** U.S FDA has placed a partial clinical hold on company's
early-stage trial of its experimental cancer drug, BLU-222, due
to safety concerns, BPMC says
** Visual problems such as light sensitivity and blurred
vision are observed in a limited number of patients - company
** Patients currently enrolled in the trial will continue on
the drug, but additional patients will not be enrolled until the
partial clinical hold is resolved - BPMC
** Stock lost ~59% in 2022
(Reporting by Sriparna Roy)
((Sriparna.Roy@thomsonreuters.com))