Current Oncology Reports

, Volume 3, Issue 2, pp 102–108 | Cite as

Determinants of prognosis and response to therapy in colorectal cancer

  • Syma Iqbal
  • Heinz-Josef Lenz


Identification of the molecular determinants of 5-fluorouracil (5-FU) and irinotecan (CPT-11) efficacy and toxicity is critically important for the development of more efficient and less toxic treatment strategies for patients with colon cancer. We have identified molecular predictors of response to chemotherapy with 5-FU and survival in patients with advanced colorectal cancer. Low gene expression levels of thymidylate synthase (TS), dihydropyrimidine dehydrogenase (DPD), and thymidine phosphorylase (TP) are associated with response and survival. Preliminary data suggest that gene expression levels of topoisomerase I, p21, bcl-2, and ICE may be predictive of response to therapy with CPT-11. Increased toxicity seen in patients treated with CPT-11 may be explained by polymorphism in the UGT1A1 gene, which is responsible for glucuronidation of the active metabolite of CPT-11.


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Copyright information

© Current Science Inc. 2001

Authors and Affiliations

  • Syma Iqbal
    • 1
  • Heinz-Josef Lenz
    • 1
  1. 1.Division of Medical OncologyUniversity of Southern California/ Norris Comprehensive Cancer CenterLos AngelesUSA

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