Updates
** Shares of cancer drug developer Iteos Therapeutics ITOS.O slide 23.6% to $12.76
** Stock had risen 27.3% to $21.26 in premarket trade
** Co says its lung cancer drug belrestotug, in combination with GSK's GSK.L drug dostarlimab, showed higher percentage of reduction or disappearance of tumor vs patients given only GSK's drug
** However, the combination led to an increase in immune-related events compared to dostarlimab monotherapy, ITOS says
** Investors seem to be concerned with adverse events from the study, but we believe they will be better managed in the late-stage trial, says Wedbush Securities analyst David Nierengarten
** The combo was tested in patients with an advanced kind of lung cancer called non-small cell lung cancer
** Including session's move, stock up 16.5% YTD
(Reporting by Kashish Tandon)