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Experimental colonic cancer in a dog
The Japanese Journal of Surgery
|January 1, 1981
Summary
This study details an experimental canine model for colonic carcinoma, induced using N-ethyl-N’-nitro-N-nitrosoguanidine (ENNG) suppositories. The model demonstrated tumor development and metastasis, offering a valuable tool for human colorectal cancer research.
Area of Science:
- Veterinary Pathology
- Oncology
- Gastroenterology
Background:
- Colorectal cancer research requires reliable animal models.
- Inducing colonic carcinoma in dogs can provide insights into human disease progression.
Purpose of the Study:
- To establish and characterize an experimental canine model of colonic carcinoma.
- To evaluate the utility of this model for studying colorectal cancer.
Main Methods:
- Induction of colonic carcinoma in a dog via anal insertion of N-ethyl-N'-nitro-N-nitrosoguanidine (ENNG) suppositories over 17 months.
- Gross and histological examination of the colon, lymph nodes, liver, lungs, and kidneys post-mortem.
- Analysis of tumor pathology, including differentiation, invasion, and metastasis.
Main Results:
- Development of an infiltrating colonic tumor with varied histological types (undifferentiated carcinoma, squamous cell carcinoma, malignant melanoma, adenocarcinoma).
- Evidence of metastasis to regional lymph nodes, liver, lungs, and renal glomeruli.
- Presence of adenocarcinoma and signet ring cell carcinoma in the gastric mucosa.
Conclusions:
- The ENNG-induced canine colonic carcinoma model successfully replicated key features of human colorectal cancer, including diverse tumor histology and distant metastasis.
- This experimental model is suitable for further investigations into the pathogenesis and treatment of colonic carcinoma.