A new murine tumour, which arose spontaneously in the lung, was characterized as a possible model of blood clotting changes during tumour and metastasis growth. The JW sarcoma (JWS), when transplanted s.c. in BALB/c mice, grows locally and spontaneously metastasizes to the lungs. The transplanted animals survive for 6 weeks. Thrombocytopenia and increased leukocyte count were observed during the metastasis growth. Concomitantly, increased fibrinogen level and reduced fibrinolytic activity were observed. At 4 weeks after tumour implantation, survival of labelled fibrinogen was prolonged. This experimental model may offer useful information on the haematological and blood clotting changes in cancer patients.
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