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Fibrinolytic and coagulant responses to regional limb perfusions of tumor necrosis factor, interferon-gamma, and/or melphalan.

Regional limb perfusion with antineoplastic agents stresses the local vasculature in a variety of ways. However, by monitoring the perfusates from limbs treated with melphalan alone or with melphalan plus tumor necrosis factor (TNF) and interferon-gamma (IFN-gamma), we were able to distinguish the effect of the cytokines on the observed coagulant and fibrinolytic responses. We collected samples of effluent from a series of lower extremities that were perfused with the cytokines and/or melphalan as treatment for localized melanoma. Both regimens produced statistically significant evidence of coagulant and fibrinolytic activation. However, limbs receiving cytokines in addition to the melphalan responded with a sharper rise in tissue plasminogen activator (tPA) and plasmin (plasmin-antiplasmin complexes [PAP]) than limbs treated with melphalan alone. Evidence of thrombin formation (prothrombin fragment 1 + 2 [F1 + 2], thrombin-antithrombin complexes [TAT]) was also greater when the cytokines were included, although the response was delayed and less consistent than the fibrinolytic activation.