New approaches to prevent intestinal toxicity of irinotecan-based regimens

Andrea Alimonti, Alain Gelibter, Ida Pavese, Francesco Satta, Francesco Cognetti, Gianluigi Ferretti, Debora Rasio, Aldo Vecchione, Mario Di Palma

Research output: Contribution to journalArticlepeer-review


Background. Irinotecan is a selective inhibitor of topoisomerase I, an enzyme part of the replication and transcription system of DNA. Irinotecan is employed, with different modalities, in the treatment of metastatic colorectal cancer, and recently it has been officially approved in association with fluorouracil (FU) and leucovorin (LV) as a first-line option in metastatic colorectal cancer. Results. One of the problems linked to the administration of this drug is the high intestinal toxicity, which constitutes its dose limiting toxicity (DLT). In routine practice, loperamide is employed as symptomatic drug for the treatment of CPT-11-induced diarrhoea, but is not completely adequate to control the problem. The role of the intestinal bacterial microflora in the pathogenesis of CPT-11-induced intestinal toxicity has been recently discovered. The active metabolite of CPT-11, SN38, is generated from CPT-11 by sieric carboxylesterase, and subsequently conjugated to SN38-G by hepatic UDP-glucuronyltransferase. SN38-G is the inactive metabolite of CPT-11 and is excreted into the small intestine, from which it is eliminated in the faeces. Some studies have shown the ability of intestinal bacterial β-glucoronidases to transform SN38-G into SN38, causing direct damage to the intestinal mucosa. Thus, alternative strategies such as intestinal alkalinization and anti-cyclooxygenase 2 (COX-2) therapy have been explored. Conclusions. In this review, we will illustrate the mechanisms which cause the CPT-11-induced diarrhoea and the potential measures available to prevent it.

Original languageEnglish
Pages (from-to)555-562
Number of pages8
JournalCancer Treatment Reviews
Issue number6
Publication statusPublished - Oct 2004


  • Bacterial β-glucuronidase inhibitors
  • Diarrhoea
  • Irinotecan

ASJC Scopus subject areas

  • Oncology
  • Urology


Dive into the research topics of 'New approaches to prevent intestinal toxicity of irinotecan-based regimens'. Together they form a unique fingerprint.

Cite this