Prognostic features of chronic myelomonocytic leukaemia: a modified Bournemouth score gives the best prediction of survival.

We have studied the clinical and laboratory features of 53 cases of chronic myelomonocytic leukaemia (CMML) defined according to the FAB criteria. A granulocyte count of greater than 16 X 10(9)/l or a monocyte count of greater than 2.6 X 10(9)/l correlated with a poorer survival, but the best predictor of poor survival was the modified 'Bournemouth' score in which one point each was allocated for Hb less than 10 g/dl, neutrophils less than 2.5 X 10(9)/l or greater than 16 X 10(9)/l, platelets less than 100 X 10(9)/l and bone marrow blasts greater than 5%. A score of 2 or more was predictive of poor survival (Chi2 = 10.25; P less than 0.001). Those patients with low monocyte and neutrophil counts and a low modified Bournemouth score tended to have a clinical course similar to refractory anaemia (RA) with an indolent course not requiring treatment and long survival whereas those with high monocyte and neutrophil counts and a high modified 'Bournemouth' score have a clinical course resembling that of refractory anaemia with excess of blasts (RAEB).