Greenwich LifeSciences rises as regulators allow expansion of late-stage breast cancer study

Greenwich Lifesciences

20/07/2026 13:36

** Shares of biotech firm Greenwich LifeSciences GLSI.O rise 6.6% to $17.39 premarket
** Co says U.S. and European regulators approved protocol changes to expand its late-stage study of experimental breast cancer immunotherapy glsi-100
** Trial tests whether glsi-100 can prevent HER2-positive breast cancer, a common type of breast cancer, from returning after surgery and treatment
** Co plans to expand enrollment to as many as 2,000 patients across nearly 200 sites in the U.S. and Europe, with additional countries planned
** Says changes could speed enrollment by allowing more patients to qualify and help generate results sooner
** Preliminary data from an open-label arm showed lower cancer recurrence rates, though the co says results remain early and could change 
** As of last close, stock down ~22% YTD

 (Reporting by Sahil Pandey in Bengaluru)
 ((Sahil.Pandey@thomsonreuters.com))