PMID- 17956601 OWN - NLM STAT- MEDLINE DCOM- 20080131 LR - 20220310 IS - 1471-2407 (Electronic) IS - 1471-2407 (Linking) VI - 7 DP - 2007 Oct 23 TI - Pharmacokinetic analysis of two different docetaxel dose levels in patients with non-small cell lung cancer treated with docetaxel as monotherapy or with concurrent radiotherapy. PG - 197 AB - BACKGROUND: Previous pharmacokinetic studies with docetaxel have mostly used 3-weekly (75 mg/m2 and 100 mg/m2) or weekly regimens (35-40 mg/m2). The pharmacokinetics and radiosensitizing efficacy of weekly 20 mg/m2 docetaxel, has however not been well characterized. We examined the pharmacokinetics of weekly docetaxel when administered with concurrent radiotherapy and compared the results with a 3-weekly 100 mg/m2 regimen. METHODS: Thirty-four patients with non small cell lung cancer (NSCLC) were included in this study, 19 receiving 100 mg/m2 docetaxel 3-weekly as single therapy, and 15 receiving 20 mg/m2 docetaxel weekly with concurrent radiotherapy. A newly developed HPLC method was used for measuring docetaxel levels, capable of quantifying docetaxel in plasma down to the nanomolar level. RESULTS: The HPLC method showed detectable concentrations of docetaxel in plasma even after 72 hours. In the present study we have demonstrated that median docetaxel plasma levels of 3 nM can be obtained 72 hours after a dose of 20 mg/m2. CONCLUSION: The pharmacokinetics of docetaxel is characterized by great inter-individual variability and at some time points plasma concentrations for 20 mg/m2 and 100 mg/m2 docetaxel were overlapping. Extrapolation of these results indicates that radio sensitizing docetaxel concentrations may be present for as long as 1 week, thus supporting the use of 20 mg/m2 weekly docetaxel. FAU - Brunsvig, Paal F R AU - Brunsvig PF AD - Department of Medical Oncology, Cancer Clinic, Rikshospitalet-Radiumhospitalet Medical Centre, Montebello, 0310 Oslo, Norway. p.f.brunsvig@medisin.uio.no FAU - Andersen, Anders AU - Andersen A FAU - Aamdal, Steinar AU - Aamdal S FAU - Kristensen, Vessela AU - Kristensen V FAU - Olsen, Harald AU - Olsen H LA - eng PT - Clinical Trial PT - Comparative Study PT - Journal Article DEP - 20071023 PL - England TA - BMC Cancer JT - BMC cancer JID - 100967800 RN - 0 (Antineoplastic Agents) RN - 0 (Orosomucoid) RN - 0 (Taxoids) RN - 15H5577CQD (Docetaxel) SB - IM MH - *Antineoplastic Agents/administration & dosage/blood/pharmacokinetics MH - Area Under Curve MH - Carcinoma, Non-Small-Cell Lung/*drug therapy/radiotherapy MH - Chromatography, High Pressure Liquid MH - Combined Modality Therapy MH - Docetaxel MH - Dose-Response Relationship, Drug MH - Female MH - Humans MH - Lung Neoplasms/*drug therapy/radiotherapy MH - Male MH - Middle Aged MH - Orosomucoid/analysis MH - Radiotherapy MH - Reproducibility of Results MH - *Taxoids/administration & dosage/blood/pharmacokinetics PMC - PMC2175508 EDAT- 2007/10/25 09:00 MHDA- 2008/02/01 09:00 PMCR- 2007/10/23 CRDT- 2007/10/25 09:00 PHST- 2007/03/13 00:00 [received] PHST- 2007/10/23 00:00 [accepted] PHST- 2007/10/25 09:00 [pubmed] PHST- 2008/02/01 09:00 [medline] PHST- 2007/10/25 09:00 [entrez] PHST- 2007/10/23 00:00 [pmc-release] AID - 1471-2407-7-197 [pii] AID - 10.1186/1471-2407-7-197 [doi] PST - epublish SO - BMC Cancer. 2007 Oct 23;7:197. doi: 10.1186/1471-2407-7-197.