MENLO PARK, Calif.--(BUSINESS WIRE)--Geron Corporation (Nasdaq:GERN) announced today that its collaborator, Merck & Co., Inc., has initiated a Phase I clinical trial of V934/V935, a non-dendritic cell based cancer vaccine candidate targeting telomerase. The trial will assess the safety, tolerability and immunogenicity of the vaccine candidate in patients with solid tumors, including non-small cell lung cancer and prostate carcinoma. Merck is developing the vaccine candidate under a July 2005 Research, Development and Commercialization License Agreement with Geron that provided Merck with exclusive worldwide rights to develop and commercialize non–dendritic cell based vaccines targeting telomerase.