MENLO PARK, Calif.--(BUSINESS WIRE)--Geron Corporation (Nasdaq:GERN) today reported positive preclinical study data showing that GRNCM1, Geron’s cardiomyocyte product derived from human embryonic stem cells (hESCs), does not cause cardiac arrhythmias after transplantation into a model of chronic heart damage designed to test this potential safety concern. GRNCM1 is being developed for the treatment of heart failure.