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Role of KIT and platelet-derived growth factor receptors as oncoproteins

Jonathan A Fletcher1

  • 1Department of Pathology, Brigham and Women's Hospital, Boston, MA 02115, USA.

Seminars in Oncology
|June 4, 2004
PubMed

Insights

Imatinib effectively targets specific tyrosine kinases like KIT and PDGFRs, crucial in various cancers. Its success in treating tumors depends on the precise molecular mechanism driving their growth.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • KIT and platelet-derived growth factor receptors (PDGFRs) are key drivers in numerous hematologic and solid tumors.
  • Imatinib is a targeted therapy that inhibits specific receptor tyrosine kinases, including KIT, PDGFRs, ABL, and BCR-ABL.

Purpose of the Study:

  • To elucidate the mechanisms by which imatinib exerts its anti-cancer effects.
  • To identify tumor types and molecular alterations most likely to respond to imatinib therapy.

Main Methods:

  • Analysis of imatinib's inhibitory effects on KIT, PDGFRs, ABL, and BCR-ABL tyrosine kinases.
  • Correlation of tumor response with specific oncogenic drivers such as chromosomal translocations, gene amplification, and activating point mutations.

Main Results:

  • Imatinib is effective against tumors driven by overexpression of PDGFR ligand, wild-type PDGFR or KIT receptors due to gene amplification, and PDGFR or KIT fusion protein-tyrosine kinases.
  • Tumors with constitutively activating point mutations in tyrosine kinases show variable responses to imatinib, dependent on mutation location.

Conclusions:

  • Imatinib's efficacy is strongly linked to the essential role of targeted tyrosine kinase activity in tumor oncogenesis.
  • Understanding the precise molecular mechanism of a malignancy is critical for predicting imatinib response.

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