Elevated serum thymidine kinase activity in canine splenic hemangiosarcoma

D. H. Thamm, D. A. Kamstock, C. R. Sharp, S. I. Johnson, E. Mazzaferro, L. V. Herold, S. M. Barnes, K. Winkler, K. A. Selting

Research output: Contribution to journalArticlepeer-review


Thymidine kinase 1 (TK1) is a soluble biomarker associated with DNA synthesis. This prospective study evaluated serum TK1 activity in dogs presenting with hemoabdomen and a splenic mass. An ELISA using azidothymidine as a substrate was used to evaluate TK1 activity. Sixty-two dogs with hemoabdomen and 15 normal controls were studied. Serum TK1 activity was significantly higher in dogs with hemangiosarcoma (HSA) than in normal dogs (mean ± SEM = 17.0 ± 5.0 and 2.01 ± 0.6, respectively), but not dogs with benign disease (mean ± SEM = 10.0 ± 3.3). Using a cut-off of 6.55 U/L, TK activity demonstrated a sensitivity of 0.52, specificity of 0.93, positive predictive value of 0.94 and negative predictive value of 0.48 for distinguishing HSA versus normal. When interval thresholds of <1.55 and >7.95 U/L were used together, diagnostic utility was increased. Serum TK1 evaluation may help to discriminate between benign disease and HSA in dogs with hemoabdomen and a splenic mass.

Original languageEnglish (US)
Pages (from-to)292-302
Number of pages11
JournalVeterinary and comparative oncology
Issue number4
StatePublished - Dec 2012
Externally publishedYes


  • Angiosarcoma
  • Biomarker
  • Cancer
  • Dog
  • Hemoabdomen

ASJC Scopus subject areas

  • General Veterinary


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