RESUMEN
Background:Overexpression/amplification of the HER2 gene in advanced gastric cancer is a predictor of response to adjuvant therapy with monoclonal antibodies.Aim: To determine the frequency of HER2 gene overexpression and amplificationin advanced gastric cancer. Material and Methods: One hundred nine advancedgastric cancer biopsy specimens, from 76 men and 33 women aged 67 ± 14 and 62± 12 years respectively, were selected. Three histological patterns (diffuse, intestinaland mixed) were recognized. Automated immunohistochemistry was performedwith monoclonal c-erbB-2 (NCL-356) Novocastra. Fluorescent in situ hybridization (FISH) for HER2 was performed in positive cases. Results: In 39% of cases,immunohistochemical staining was negative. It was 1+, 2+ and 3+ positive in 15,36 and 11% of cases, respectively. It was positive in 16% and 3% of intestinal typeand mixed carcinomas, respectively. It was negative in all diffuse carcinomas. FISHwas performed in 39 (2 +) cases and in 11 (3 +) cases. The gene amplification waspositive in two (2 +) and 11 (3 +) cases (11.9%). The overall concordance betweenimmunohistochemical staining and in situ hybridization was 85%. Conclusions: Inadvanced gastric cancer, HER2 gene overexpression or amplification was observed in11% and 12% of cases, respectively.
Asunto(s)
Anciano , Femenino , Humanos , Masculino , Persona de Mediana Edad , Adenocarcinoma/genética , Amplificación de Genes/genética , /genética , Neoplasias Gástricas/genética , Adenocarcinoma/patología , Expresión Génica , Hibridación Fluorescente in Situ , Neoplasias Gástricas/patología , Análisis de Matrices TisularesRESUMEN
Entre los tumores hepáticos benignos se encuentra el granuloma hepático secundario a reacción por cuerpo extraño que puede ser provocado por agentes como el talco, almidón y materiales de sutura entre otros. Se presenta el,caso de un paciente de 34 años con antecedentes de traumatismo toracoabdominal que presenta, a los 5 años de evolución, dolor abdominal y baja de peso, evidenciándose en estudio por imágenes un tumor hepático sólido único. Se reseca quirúrgicamente, encontrándose en el examen histopatológico una lesión inflamatoria extensa con granulomas de tipo cuerpo extraño