| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
Research Institute of Drug Safety, Setsunan University, Hirakata, Osaka, Japan (KO, IN); and Marupi Lifetech Co., Ltd., Ikeda, Osaka, Japan (TY, KN)
Mast cell tumors (MCTs) of gastrointestinal origin that had been surgically removed from 39 dogs were examined to evaluate their pathologic features. Miniature breeds, especially Maltese, were most frequently affected. The average age of affected dogs was 9.7 ± 2.6 years. No sex difference was apparent. The most frequently affected sites were in the upper digestive tract, and the prognosis was very poor. Grossly, the gastrointestinal wall was prominently thickened, and the lumen of the affected gut was usually narrowed. Microscopically, there was diffuse transmural invasion of round to pleomorphic tumor cells. Tumor cells had moderate to abundant cytoplasm, round to ovoid nuclei with scattered chromatin, and mitotic figures. Fibrous stroma was observed in about half of the tumors. There was variable infiltration of eosinophils. In all tumors, cytoplasmic granules showed weak metachromasia, but the number of granules was very small. Immunohistochemical staining for c-kit and mast cell tryptase was positive in 77% and 62% of tumors, respectively. All tumors were positive for at least two of these markers. Immunohistochemical staining for p53 was positive in 13% of the tumors. Reactivity for staining markers and p53 was unrelated to cell pleomorphism, vessel invasion, or survival time. Gastrointestinal MCTs have histologic and immunohistochemical features completely different from those of other primary or metastatic gastrointestinal tumors. The combination of immunostaining for mast cell tryptase and c-kit and histochemical staining for metachromasia appears to be a powerful tool for the diagnosis of gastrointestinal MCTs.
Key words: c-kit; dogs; gastrointestinal tract; immunohistochemistry; mast cell; mast cell tryptase; mast cell tumor; p53.
Request reprints from Dr. K. Ozaki, Research Institute of Drug Safety, Setsunan University, 45-1 Nagaotohge-cho, Hirakata, Osaka 573-0101 (Japan). E-mail: ozaki{at}pharm.setsunan.ac.jp.
This article has been cited by other articles:
 |
|
 |
|
  K. Ozaki, T. Yamagami, K. Nomura, and I. Narama T-Cell Lymphoma with Eosinophilic Infiltration Involving the Intestinal Tract in 11 Dogs Vet. Pathol., May 1, 2006; 43(3): 339 - 344. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. J. Fernandez, K. H. West, M. L. Jackson, and B. A. Kidney Immunohistochemical and Histochemical Stains for Differentiating Canine Cutaneous Round Cell Tumors Vet. Pathol., July 1, 2005; 42(4): 437 - 445. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
