Pharmacokinetics and metabolism of ifosfamide in relation to DNA damage assessed by the COMET assay in children with cancer

Willits, I, Price, L, Parry, A, Tilby, M J, Ford, Dianne, Cholerton, S, Pearson, A D J and Boddy, A V (2005) Pharmacokinetics and metabolism of ifosfamide in relation to DNA damage assessed by the COMET assay in children with cancer. British Journal of Cancer, 92 (9). pp. 1626-1635. ISSN 0007-0920

6602554.pdf - Published Version
Available under License Creative Commons Attribution Non-commercial Share Alike 4.0.

Download (483kB) | Preview
Official URL:


The degree of damage to DNA following ifosfamide (IFO) treatment may be linked to the therapeutic efficacy. The pharmacokinetics and metabolism of IFO were studied in 19 paediatric patients, mostly with rhabdomyosarcoma or Ewings sarcoma. Ifosfamide was dosed either as a continuous infusion or as fractionated doses over 2 or 3 days. Samples of peripheral blood lymphocytes were obtained during and up to 96 h after treatment, and again prior to the next cycle of chemotherapy. DNA damage was measured using the alkaline COMET assay, and quantified as the percentage of highly damaged cells per sample. Samples were also taken for the determination of IFO and metabolites. Pharmacokinetics and metabolism of IFO were comparable with previous studies. Elevations in DNA damage could be determined in all patients after IFO administration. The degree of damage increased to a peak at 72 h, but had returned to pretreatment values prior to the next dose of chemotherapy. There was a good correlation between area under the curve of IFO and the cumulative percentage of cells with DNA damage (r2 = 0.554, P = 0.004), but only in those patients receiving fractionated dosing. The latter patients had more DNA damage (mean ± s.d., 2736 ± 597) than those patients in whom IFO was administered by continuous infusion (1453 ± 730). The COMET assay can be used to quantify DNA damage following IFO therapy. Fractionated dosing causes a greater degree of DNA damage, which may suggest a greater degree of efficacy, with a good correlation between pharmacokinetic and pharmacodynamic data.

Item Type: Article
Subjects: B900 Others in Subjects allied to Medicine
C100 Biology
Department: Faculties > Health and Life Sciences > Applied Sciences
Depositing User: Rachel Branson
Date Deposited: 17 Feb 2021 10:29
Last Modified: 31 Jul 2021 15:01

Actions (login required)

View Item View Item


Downloads per month over past year

View more statistics