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The effect of recombinant interleukin-2 (rIL-2) pretreatment on the pharmacokinetics of paclitaxel was investigated in the murine Lewis lung carcinoma model in C57B1/6 mice. Paclitaxel 15 mg/kg was administrated orally to mice, either alone or after 3 days pretreatment with twice daily dose of 16.5 microg rIL-2. Plasma concentrations of paclitaxel were estimated by reversed phase HPLC. Pharmacokinetic parameters were determined using MicroPharm software. Using Bailer's method, a significant difference was observed in the AUCs of paclitaxel administrated alone and with rIL-2 pretreatment (928.2 +/- 136.8 vs 2549.6 +/- 131.3 ng.h.ml(-1), p &lt;0.0001). Pretreatment with rIL-2 resulted in a 3-fold increase in the oral bioavailability of paclitaxel without altering its elimination half-life (0.798 vs 0.747 h). This could be due to the inhibition of P-glycoprotein (P-gp) mediated transport, thus enhancing paclitaxel intestinal absorption. The combination of these two drugs could be of interest in clinical practice due to their activity in pulmonary cancer.

ENHANCED ORAL BIOAVAILABILITY OF PACLITAXEL BY RECOMBINANT INTERLEUKIN-2 IN MICE WITH MURINE LEWIS LUNG CARCINOMA