Abstract: PURPOSE To develop a risk score for patients with advanced systemic mastocytosis (AdvSM) that integrates clinical and mutation characteristics. PATIENTS AND METHODS The study included 383 patients with AdvSM from the German Registry on Disorders of Eosinophils and Mast Cells (training set; n = 231) and several centers for mastocytosis in the United States and Europe, all within the European Competence Network on Mastocytosis (validation set; n = 152). A Cox multivariable model was used to select variables that were predictive of overall survival (OS). RESULTS In multivariable analysis, the following risk factors were identified as being associated with OS: age greater than 60 years, anemia (hemoglobin 10 g/dL), thrombocytopenia (platelets 100 × 109/L), presence of one high molecular risk gene mutation (ie, in SRSF2, ASXL1, and/or RUNX1), and presence of two or more high molecular risk gene mutations. By assigning hazard ratio-weighted points to these variables, the following three risk categories were defined: low risk (median OS, not reached), intermediate risk (median OS, 3.9 years; 95% CI, 2.1 to 5.7 years), and high risk (median OS, 1.9 years; 95% CI, 1.3 to 2.6 years; P .001). The mutation-adjusted risk score (MARS) was independent of the WHO classification and was confirmed in the independent validation set. During a median follow-up time of 2.2 years (range, 0 to 23 years), 63 (16%) of 383 patients experienced a leukemic transformation to secondary mast cell leukemia (32%) or secondary acute myeloid leukemia (68%). The MARS was also predictive for leukemia-free survival (P

En el presente trabajo doctoral se ha propuesto los siguientes objetivos: Evaluar la utilidad de la citometría de flujo en muestras obtenidas por PAAF frente a la citología convencional (asociada o no al análisis histológico/inmunohistoquímico), en el diagnóstico inicial y la clasificación de los SLPC. Investigar la utilidad del análisis inmunofenotípico de la expresión de proteínas de la familia de las tetraspaninas en el diagnóstico y clasificación de los SLPC-B, tomando como referencia el patrón de expresión de estas proteínas en células B normales. Diseñar una nueva estrategia metodológica que permita evaluar de forma objetiva la eficiencia de un panel de combinaciones de anticuerpos empleado en la rutina para la clasificación de los subtipos más frecuentes de SLPC-B, proporcionando a la vez información sobre los marcadores más útiles y su contribución relativa a dicha clasificación diagnóstica.