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Regional Lymph Node Metastasis Created by Partial Excision of Carcinomas Induced in Hamster Cheek Pouch with 9,10-Dimethyl-1,2-Benzanthracene

Department of Oral & Maxillofacial Surgery I, Matsumoto Dental College, 1780 Gobara, Hirooka, Shiojiri, Nagano 399-07, Japan

M. Mogi

Department of Oral Biochemistry, Matsumoto Dental College, 1780 Gobara, Hirooka, Shiojiri, Nagano 399-07, Japan

Y. Katsumata

Department of Oral & Maxillofacial Surgery I, Matsumoto Dental College, 1780 Gobara, Hirooka, Shiojiri, Nagano 399-07, Japan

T. Chino

Department of Oral & Maxillofacial Surgery I, Matsumoto Dental College, 1780 Gobara, Hirooka, Shiojiri, Nagano 399-07, Japan

The feasibility of using the hamster cheek pouchldimethyl-benzanthracene (DMBA) system as an experimental model of lymphatic metastasis was investigated. Forty male Syrian golden hamsters treated with DMBA were divided into two equal groups-one with surgical excision of their tumors and a control group without tumor excision. In the excision group, the animals received three applicationslweek to the left cheek pouch of 0.3% DMBA in acetone for 14 weeks. Following a three-week observation period, the tumors in the pouch were excised at their base, and the animals were killed after four weeks of further observation. In the control group, the animals were treated for 14 weeks in a manner similar to that used for the excision group, left for seven weeks without treatment, and then killed. Cheek pouches with tumors and cervical lymph nodes were processed for histological examination. All of the animals, both with and without metastasis, had borne squamous cell carcinomas (SCC) in their treated cheek pouches. Histologically, seven out of 16 animals in the excision group showed metastatic deposits of SCC confined to the left cervical lymph nodes, while in the control group, metastasis was not found in any of the 19 animals with SCC in their cheek pouches. The results demonstrate that surgical excision of the hamster cheek pouch carcinoma is efficient in producing unequivocal lymph node metastasis.

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Journal of Dental Research, Vol. 66, No. 11, 1673-1679 (1987)
DOI: 10.1177/00220345870660111401


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