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espanolIntroduccion: Los estilos de afrontamiento son variables psicologicas que pueden predecir la adaptacion psicologica y en sentido contrario una mayor disfuncion psicosocial en pacientes con cancer. Se han descrito dos dimensiones: centrados en el problema o activos positivos, caracterizados por la busqueda de informacion, planificacion y resolucion de problemas; y los dirigidos a la emocion o evitativos caracterizados por el escape, distanciamiento o desesperanza. Objetivo: Determinar las propiedades psicometricas de la Escala de Afrontamiento del Cancer en una muestra de pacientes con cancer de la poblacion mexicana. Metodo: Participaron 317 pacientes del Instituto Nacional del Cancer, de los cuales 148 eran mujeres (46,7%) y 169 hombres (53,4%), con una edad media de 46,2 anos. Los participantes completaron al mismo tiempo el Mental Adjustment to Cancer (MAC), el HADS y el Termometro del Distress. Resultados: Mediante el analisis factorial se identificaron cinco factores que explicaron el 53,32% de la varianza, con 22 reactivos. La consistencia interna de la escala global fue satisfactoria (0,81). La validez concurrente mostro asociaciones significativas (Pearson r = - 0,120 – 0,586, p EnglishIntroduction: Coping styles can predict psychological adaptation and in the opposite direction a greater psychosocial dysfunction in patients with cancer. Two dimensions have been described: focused on the problem or positive assets, characterized by the search for information, planning and problem solving; and those directed at emotion or avoidant characterized by escape, distancing or despair have been consistently described in the literature. Objective: Determine the psychometric properties of the Mental Adjustment to Cancer (MAC) in a sample of patients with cancer from the Mexican population. Method: Three hundred seventeen patients from the National Cancer Institute participated, of which 148 were women (46.7%) and 169 men (53.4%), with a mean age of 46.2 years. Completed concurrently the Mental Adjustment to Cancer , HADs and Distress Thermometer. Results: A factor analysis show to five factors explained 53.32% of the variance, with 22 items loading on factors in a way similar to the original version. The internal consistency of the overall scale was satisfactory (0.81). The concurrent validity assessed by way of correlations with concurrent measures showed significant associations (Pearson r= - 0.120 - 0.586, p