** Drug developer X4 Pharmaceuticals' XFOR.O shares rise
9.9% to $1.29 premarket
** U.S. FDA approves co's therapy to treat WHIM syndrome, a
rare genetic immunodeficiency disease, for use in patients aged
12 years or older
** The therapy, which will be sold under brand name
Xolremdi, is first of its kind to get U.S. approval specifically
for WHIM syndrome's treatment
** WHIM is characterized by disorders in which body's immune
system does not function properly
** The approval is based on late-stage study where the
therapy showed 60% reduction in infection rate compared with
placebo
** Up to last close, stock up 38.9% YTD
(Reporting by Sneha S K in Bengaluru)
((Sneha.SK@thomsonreuters.com;))