A Scoping Review on Tyrosine Kinase Inhibitors in Cats: Current Evidence and Future Directions

Žiga Žagar1, Jarno M Schmidt1

  • 1IVC Evidensia Small Animal Clinic Hofheim, 65719 Hofheim am Taunus, Germany.

Insights

Tyrosine kinase inhibitors (TKIs) show promise in feline oncology, particularly toceranib phosphate for mast cell tumors. Further research is needed to expand TKI applications and address knowledge gaps in cat cancer treatment.

Area of Science:

  • Veterinary Oncology
  • Pharmacology

Background:

  • Tyrosine kinase inhibitors (TKIs) are established in human and canine cancer therapy.
  • Their application in feline oncology remains limited, with no TKIs currently approved for cats.

Purpose of the Study:

  • To systematically review research on tyrosine kinase expression in feline tissues.
  • To evaluate the in vitro and in vivo use of TKIs in domestic cats.
  • To identify knowledge gaps and potential future indications for TKIs in feline cancer.

Main Methods:

  • A comprehensive literature search of three electronic databases and reference lists.
  • Inclusion criteria identified 139 relevant studies.
  • Analysis focused on tyrosine kinase expression and TKI efficacy in feline neoplastic and non-neoplastic tissues.

Main Results:

  • Commonly studied feline tumors include mast cell tumors (MCTs), mammary carcinomas, squamous cell carcinomas, and injection-site sarcomas.
  • Toceranib phosphate demonstrated the most efficacy, particularly against feline MCTs.
  • Mammary carcinomas show potential for TKI treatment.

Conclusions:

  • Toceranib phosphate is currently the most promising TKI for feline cancers, especially MCTs.
  • Further research is crucial to establish new indications and bridge knowledge gaps in feline oncology.
  • Clinical trials are needed to validate TKI efficacy and safety in cats.