Validation of the triple a model (age, absolute neutrophil count, absolute lymphocyte count) for the prediction of survival and thrombosis in 1000 patients with polycythemia vera

/L) lymphocyte counts. The presented multicenter international study on a large cohort of PV patients validated the findings from prior reports and demonstrated excellent prognostic properties of the triple A model with respect to both thrombosis and survival in PV. Moreover, it revealed that the addition of patient comorbidities (assessed through the Charlson comorbidity index (CCI)) to ELN and triple A score may not help to further refine the survival prognostication of these patients. Therefore, the triple A score with its simplicity seems to offer excellent balance during the initial risk assessment in PV, implicating its global applicability.