Nadeau Nadeau K K Hwa Hwa V V Rosenfeld Rosenfeld RG RG STAT5b deficiency: an unsuspected cause of growth failure, immunodeficiency, and severe pulmonary disease STAT5b deficiency: an unsuspected cause of growth failure, immunodeficiency, and severe pulmonary disease J Pediatr J Pediatr 2011 2011 158 158 701 701 708 708 10.1016/j.jpeds.2010.12.042 10.1016/j.jpeds.2010.12.042 21414633 21414633. Here, STAT5B is linked to immune system disorder.