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The role of blood platelet and fibrinogen in experimental metastasis in nude mice following whole body X-irradiation.

Human tumor cells were injected intravenously into nude mice following whole body X-irradiation and the number of platelets and the serum fibrinogen level in the blood were examined. Pulmonary metastasis was present in the irradiated mice but not in the non-irradiated mice. The number of platelets decreased rapidly after intravenous injection of the tumor cells and remained low in the irradiated mice, yet there was a recovery in the number in the non-irradiated mice. Serum fibrinogen level was increased in the irradiated mice and was decreased after intravenous injection in the irradiated mice, to a greater extent than seen in the non-irradiated mice. These findings may be related to trapping and lodgement of tumor cells in the target organ.