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Overexpression of P-glycoprotein (Pgp), a multidrug transporter encoded by the MDR1 gene, is associated with chemoresistance in some human solid tumor malignancies. To date, analyses of MDR1 levels in solid tumors have examined constitutive increases in expression at relapse. In the present study, we have evaluated the acute induction of MDR1 gene expression in a solid human tumor as a function of time in response to in vivo exposure to chemotherapy. Five patients with unresectable sarcomapmid:10589744 fatcat:xojfxfc4sjf7bbfviq23lphkbu