Elevated levels of thymidine kinase 1 peptide in serum from patients with breast cancer.

Thymidine kinase (TK) has an important role in DNA synthesis and is thus related to cell proliferation and turn-over. Traditionally, TK has been measured by enzymatic activity or radioimmunoassays. These assays are difficult to adapt to random access instruments. The aim of this study was to evaluate a new immunological sandwich assay for detection of TK peptides in serum from breast cancer patients.
Serum samples were collected from patients with breast cancer and stored frozen at -70 degrees C. The samples were collected after surgery, after metastatic tumor recurrence and after chemotherapy due to tumour recurrence. Patients' serum samples were analysed by the TK enzyme-linked immunosorbent assay (ELISA).
In receiver operating characteristics (ROC) analyses of TK1 for diagnosis of breast cancer, the area under the curve (AUC) collected four weeks after surgery was 0.56 (95% CI 0.47-0.65), for samples collected postsurgically after tumour recurrence 0.73 (95% CI 0.65-0.80), and after chemotherapy 0.64 (95% CI 0.56-0.72).
This study indicates that the tumour proliferation marker TK has a potential as a serum marker in breast cancer. Further studies are warranted to verify this observation.
AuthorsLena Carlsson, Anders Larsson, Henrik Lindman
JournalUpsala journal of medical sciences (Ups J Med Sci) Vol. 114 Issue 2 Pg. 116-20 ( 2009) ISSN: 2000-1967 [Electronic] Sweden
PMID19396699 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Biomarkers, Tumor
  • Peptide Fragments
  • Thymidine Kinase
  • thymidine kinase 1
  • Biomarkers, Tumor (blood)
  • Breast Neoplasms (blood, enzymology)
  • Enzyme-Linked Immunosorbent Assay
  • Female
  • Humans
  • Peptide Fragments (blood)
  • ROC Curve
  • Sensitivity and Specificity
  • Thymidine Kinase (blood, chemistry)

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