CSF2 and juvenile myelomonocytic leukemia: Table III (pairwise comparisons of GM-CSF-stimulated clonogenic assays) showed that at different GM-CSF concentrations, JMML patients were significantly more responsive to GM-CSF than both the controls and NS patients. Concerning unstimulated cultures, a significant growth advantage was observed also in NS/MPD when compared with the controls and NS patients (Table III).