Many patients with a chronic disease or cancer have to contend with anemia. At present, the hormone EPO is administered to a large number of these patients to alleviate the anemia. But unfortunately, treatment with EPO is not always effective. Scientists have recently been researching the role of the Gas6 protein. This substance has proven successful in the treatment of mice with anemia. In addition, Gas6 contributes to a reinforcement of EPO’s effect.