Monocyte-derived APCs are central to the response of PD1 checkpoint blockade and provide a therapeutic target for combination therapy ===================================================================================================================================== * Sjoerd T T Schetters * Ernesto Rodriguez * Laura J W Kruijssen * Matheus H W Crommentuijn * Louis Boon * Jan Van den Bossche * Joke M M Den Haan * Yvette Van Kooyk