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Eicosanoids and metastasis: experimental aspects in Lewis lung carcinoma.

摘要:

Lewis lung primary carcinomas have been extracted for eicosanoids, and the findings examined in relation to lung metastases. The order of the 5 compounds measured was PGE2 greater than PGE1 greater than PGF2 alpha greater than 6-keto-PGF1 alpha greater than TXB2. On the basis of the observation that the balance of PGI2 and TXA2 is altered in metastasis (Honn et al., 1983), the effects of Nafazatrom, a PGI2 enhancing agent, and imidazole, a thromboxane synthetase inhibitor, were tested. The experimental approach taken was to study spontaneous lung metastases after removal of the primary tumour at 13 days after tumour cell inoculation. Both Nafazatrom and imidazole decreased the lung weight when given during the period either before or after the excision of the primary tumour. There was a general trend toward an increase in the number of small lung nodules (greater than 2 mm) and a decrease in large lung nodules (greater than 2 mm) as a result of the chemotherapy. Mean survival time of the mice was significantly different among the five groups, with the mice surviving the longest in the group treated with Nafazatrom after the excision of the primary tumour.

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