Agenus Inc. (NASDAQ: AGEN), an immuno-oncology company with a pipeline of immune checkpoint antibodies and cancer vaccines, announced today that the US Food and Drug Administration (FDA) granted marketing authorization to GlaxoSmithKline's (GSK) herpes zoster vaccine, SHINGRIX, containing Agenus' proprietary immune adjuvant QS-21 Stimulon®. SHINGRIX is indicated for prevention of herpes zoster (also known as shingles) in adults aged 50 years and older. The addition of QS-21 Stimulon helps improve the vaccine's effectiveness by boosting immune response in older adults who often experience age-related decline in immunity.