Pharmacokinetic profile of vinorelbine, a new semi-synthetic vinca alkaloid, determined by high-performance liquid chromatography.
1. Vinorelbine (NVB), a new semi-synthetic vinca alkaloid, is currently used in the treatment of advanced non-small-cell lung cancer (NSCLC) and advanced breast cancer. The pharmacokinetic profile of NVB has been redefined with a specific h.p.l.c. method which measures NVB and desacetyl-NVB. 2. In man, the pharmacokinetics of NVB are best characterized by a three-compartment model with a terminal half-life of 42 h and a large volume of distribution (75 l/kg). The total clearance was 1.26 lh-1 kg-1 and about 11% of the dose was eliminated by the kidneys. Desacetyl-NVB was a minor urinary metabolite. 3. Human pulmonary distribution study showed higher levels of NVB in lung tissue than in serum during the first 3 h after NVB injection; the tumour concentrations were lower than those determined in healthy parenchyma. 4. In the micropig, the 0-48 h biliary excretion of unchanged drug accounted for 25% dose with 21.5% being eliminated during the first 8 h. Desacetyl-NVB concentrations were low and inconsistent. 5. Preliminary results show a better response rate with the combination of cisplatin and NVB than that obtained with NVB alone in the treatment of advanced NSCLC. This increased activity is not the result of a pharmacokinetic interaction since it was shown that cisplatin did not alter the kinetic profile of NVB. 6. This is the first pharmacokinetic investigation of unlabelled vinca alkaloids by a h.p.l.c. procedure.(ABSTRACT TRUNCATED AT 250 WORDS)
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Laboratoire de Pharmacocinétique, Institut de Bactériologie, Strasbourg, France.
Jehl
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Quoix
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D000818:Animals; D000970:Antineoplastic Agents / Q000493:pharmacokinetics* / Q000627:therapeutic use; D001652:Bile Ducts / Q000378:metabolism; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy / Q000378:metabolism; D013056:Spectrophotometry, Ultraviolet; D013552:Swine; D013556:Swine, Miniature; D014018:Tissue Distribution; D014747:Vinblastine / Q000031:analogs & derivatives* / Q000493:pharmacokinetics / Q000627:therapeutic use; D000077235:Vinorelbine
D000970:Antineoplastic Agents; D014747:Vinblastine; D000077235:Vinorelbine