** Shares of drug developer Coya Therapeutics COYA.O rise
~7.8% to $10.98 premarket
** Co says its experimental Alzheimer's drug was safe and
increased levels of a type of immune cells in patients with
Alzheimer's disease during a small, mid-stage trial
** The antibody drug COYA 301, part of the IL-2 treatment
class, aims to enhance the function of regulatory T cells, which
suppress immune responses
** Says, once-a-month treatment with the drug showed a
slight improvement in cognitive function and also improved
levels of the disease-related protein beta-amyloid in the brain
and spinal fluid
** Up to last close, stock up 37.5% YTD
(Reporting by Christy Santhosh)
((Christy.Santhosh@thomsonreuters.com))