Avaliação da proliferação celular como indicador prognóstico para mastocitomas cutâneos caninos Evaluation of cellular proliferation as prognostic indicator for canine cutaneous mast cell tumors

Abstract

Este estudo teve como objetivo avaliar o valor prognóstico de marcadores de proliferação celular em casos de mastocitomas cutâneos caninos. Vinte e três casos foram analisados quanto à expressão imuno-histoquímica de Ki67 e do Antígeno Nuclear de Proliferação Celular (PCNA), sendo subsequentemente acompanhados clinicamente. Observou-se que a expressão de Ki67 mantém relação negativa com a tradicional graduação histopatológica (p= 0,0418; pThis study evaluated the prognostic value of cell proliferation markers for canine cutaneous mast cell tumor cases. Twenty-three cases were analyzed with regard to immuno-histochemical expression of Ki67 and Proliferating Cell Nuclear Antigen (PCNA), and were clinically followed up. Ki67 expression was related to the traditional histopathological grading (p= 0.0418; p<0.05 between grades I and III), and was a reliable indicator of post-surgical survival (p=0.0089). PCNA immunoexpression did not show statistically significant values in the prediction of disease-related mortality and survival, although it is correlated to Ki67 expression. These results confirm that information about tumoral proliferative activity through Ki67 immunohistochemical detection can improve canine cutaneous mast cell tumor grading with regard to malignancy.

Keywords

• Mastocitoma
• PCNA
• Ki67
• marcadores de proliferação
• marcadores de prognóstico
• Mast cell tumor
• PCNA
• Ki67
• proliferation markers
• prognostic markers