Erythropoietin, also known as erythropoetin, haematopoietin, or haemopoietin, is a glycoprotein cytokine secreted mainly by the kidneys in response to cellular hypoxia; it stimulates red blood cell production in the bone marrow. From Wikipedia
New research reveals tumor-derived erythropoietin suppresses immune responses, with combined EPO blockade and anti-PD-1 therapy achieving complete tumor regression in preclinical models.