Changes of gastrointestinal argyrophil endocrine cells in the COLO205 tumor-implanted Balb/c-nu/nu mice

The regional distributions and frequencies of argyrophil endocrine cells in gastrointestinal (GI) tract of Balb/c-nu/ nu mouse were studied using Grimelius silver stain after abdominal subcutaneous implantation of COLO205. The experimental animals were divided into two groups, one is non-implanted group (Sham) and the other is COLO205-implanted group. Samples were collected from GI tract (fundus, pylorus, duodenum, jejunum, ileum, cecum, colon and rectum) at 21 days after implantation of COLO205 cells (1x10(6) cell/mouse). In this study, argyrophil cells were detected throughout the entire GI tract with various frequencies regardless of implantation. Most of these argyrophil cells in the mucosa of GI tract were generally spherical or spindle in shape (open type cell) while cells showing round in shape (close type cell) were found occasionally in gastric and/or intestinal gland regions. The regional distributions of argyrophil cells in COLO205 were similar to those of Sham. However, significant decreases of argyrophil cells were detected in COLO205 compared to those of Sham except for the jejunum and ileum. In the jejunum and ileum, argyrophil cells in COLO205 showed similar frequencies compared to those of Sham. In the pylorus, the most dramatically decreasement of argyrophil cells were detected in COLO205 compared to that of Sham. Implantation of COLO205 tumor cell line induced severe quantitative changes of argyrophil cell density, and the abnormality in density of GI endocrine cells may contribute to the development of gastrointestinal symptoms such as anorexia and indigestion, frequently encountered in patients with cancer.

Tumor estromal maligno de colon transverso. Informe de un caso / Malignant stromal tumor of transverse colon

Antecedentes. Los sarcomas de colon son poco comunes, de ellos, el más frecuente es el leiomiosarcoma. A la fecha se han informado 45 casos de tumor estromal maligno en la literatura mundial. La histogénesis de estas neoplasias mesenquimatosas se determinan con análisis ultraestructural y tinciones de inmunohistoquímica, sin embargo, cuando estas técnicas especiales son negativas y existe duda en cuanto a la línea de diferenciación celular (músculo liso, neural o indiferenciado), es preferible llamarlos tumores estromales del tracto gastrointestinal (TEGI). Objetivo. Presentar un caso de tumor estromal maligno del colon transverso. Método. Se revisó el caso de un paciente de 46 años de edad con diagnóstico de tumor estromal maligno de colon transverso y el tratamiento efectuado. Resultados. Se informa el caso de un paciente con diagnóstico de tumor estromal maligno en el colon transverso, cuyas principales manifestaciones clínicas fueron dolor abdominal, hemorragia transanal, y finalmente oclusión intestinal. Se sometió a laparotomía exploradora, encontrando intusucepción del colon transverso, por lo que se hizo hemicolectomía derecha ampliada. La evolución postquirúrgica fue satisfactoria y la vigilancia a tres años no ha demostrado datos de activación tumoral. Conclusiones. Los tumores estromales de colon son raros y su tratamiento es la resección quirúrgica con fines curativos o paliativos