CSF2 and asthma: Blood eosinophils obtained from patients with asthma show delayed apoptosis when compared to eosinophils from healthy controls[4] and elevated levels of eosinophil survival-prolonging cytokines interleukin (IL)-5 and granulocyte macrophage-colony stimulating factor (GM-CSF) have been found from the bronchoalveolar lavage fluid of asthmatics[5].