Cancer Chemotherapy and Pharmacology

, Volume 68, Issue 3, pp 721–731 | Cite as

Effect of radiation on the penetration of irinotecan in rat cerebrospinal fluid

  • Amit Khatri
  • M. Waleed Gaber
  • Richard C. Brundage
  • Michael D. Naimark
  • Suzan K. Hanna
  • Clinton F. Stewart
  • Mark N. Kirstein
Original Article

Abstract

Purpose

Anticancer agents are useful for treating brain tumors, but sub therapeutic concentrations due to decreased blood–brain barrier (BBB) penetration limit their effectiveness. This study evaluated the effect of cranial radiation on the pharmacokinetics of irinotecan in plasma and cerebrospinal fluid (CSF).

Methods

Rats (n = 48) were treated with irinotecan (10 mg/kg), and then administered 10 or 20 Gy or sham irradiation as control after drug. The pharmacokinetics for irinotecan, SN-38, and APC were measured in plasma and CSF over 6 h. Up to 7 plasma samples per animal were collected, and one CSF sample was collected per animal (serial sacrifice design). Population pharmacokinetic analysis was performed with NONMEM, and radiation tested as a covariate for the fraction of irinotecan (fCSF) entering the CSF.

Results

The estimate of fCSF (% and RSE) was 0.165 (73.5) for the control group and 0.265 (66.5) for radiation-treated groups, respectively (P < 0.05). Predictive check plots showed that the model adequately described the overall trend and variability in the observed data. The median values of bootstrap parameters were similar to the NONMEM estimates based on the original data set.

Conclusions

These results indicate that cranially administered radiation can increase the penetration of anticancer agents such as irinotecan into the CSF. Studies that evaluate radiation-fractionation, radiation-time course effect relationships, blood–brain barrier and blood-tumor barrier effects for irinotecan and other anticancer agents are warranted.

Keywords

Irinotecan Radiation Cerebrospinal fluid Pharmacokinetics 

Notes

Conflict of interest

None.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Amit Khatri
    • 1
  • M. Waleed Gaber
    • 2
  • Richard C. Brundage
    • 1
  • Michael D. Naimark
    • 3
  • Suzan K. Hanna
    • 3
  • Clinton F. Stewart
    • 3
  • Mark N. Kirstein
    • 1
    • 4
  1. 1.Department of Experimental and Clinical Pharmacology, College of PharmacyUniversity of MinnesotaMinneapolisUSA
  2. 2.Department of PediatricsBaylor College of MedicineHoustonUSA
  3. 3.Department of Pharmaceutical SciencesSt. Jude Children’s Research HospitalMemphisUSA
  4. 4.Masonic Cancer CenterUniversity of MinnesotaMinneapolisUSA

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