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Erschienen in: Cancer Chemotherapy and Pharmacology 2/2013

01.08.2013 | Original Article

Hepatic activation of irinotecan predicts tumour response in patients with colorectal liver metastases treated with DEBIRI: exploratory findings from a phase II study

verfasst von: R. P. Jones, P. Sutton, R. M. D. Greensmith, A. Santoyo-Castelazo, D. F. Carr, R. Jenkins, C. Rowe, J. Hamlett, B. K. Park, M. Terlizzo, E. O’Grady, P. Ghaneh, S. W. Fenwick, H. Z. Malik, G. J. Poston, N. R. Kitteringham

Erschienen in: Cancer Chemotherapy and Pharmacology | Ausgabe 2/2013

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Abstract

Purpose

The response of colorectal liver metastases to the cytotoxic agent irinotecan varies widely. Attempts to correlate tumour metabolism with response have been mixed. This study investigated the hepatic metabolism of irinotecan as a potential predictor of tumour response to irinotecan-eluting beads (DEBIRI).

Methods

Ten patients with colorectal liver metastases were treated with 200 mg irinotecan (as DEBIRI) as part of the PARAGON II study. Hepatic expression of key metabolising enzymes was measured using mass spectrometry-based proteomics. Serum drug concentrations and hepatic irinotecan metabolism were characterised and correlated with tumour response.

Results

Serum concentrations of irinotecan metabolites did not correlate with hepatic metabolism or pathological response. There was a strong correlation between hepatic CES-2 expression and activation of irinotecan (r 2 = 0.96, p < 0.001). Patients with a UGT1A1*28 6/7 SNP showed no difference in drug metabolism or pathological response. Hepatic CES-2 mediated activation of irinotecan clearly correlated with tumour replacement by fibrosis (r 2 = 0.54, p = 0.01).

Conclusion

This study provides the first evidence that hepatic activation of irinotecan predicts tumour response. Delivery of liver-targeted irinotecan to normal liver tissue rather than tumour may be a more rational approach to maximise response.
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Metadaten
Titel
Hepatic activation of irinotecan predicts tumour response in patients with colorectal liver metastases treated with DEBIRI: exploratory findings from a phase II study
verfasst von
R. P. Jones
P. Sutton
R. M. D. Greensmith
A. Santoyo-Castelazo
D. F. Carr
R. Jenkins
C. Rowe
J. Hamlett
B. K. Park
M. Terlizzo
E. O’Grady
P. Ghaneh
S. W. Fenwick
H. Z. Malik
G. J. Poston
N. R. Kitteringham
Publikationsdatum
01.08.2013
Verlag
Springer Berlin Heidelberg
Erschienen in
Cancer Chemotherapy and Pharmacology / Ausgabe 2/2013
Print ISSN: 0344-5704
Elektronische ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-013-2199-5

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