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. 1990 Oct;62(4):663–667. doi: 10.1038/bjc.1990.352

Thymidine kinase in breast cancer.

J F Robertson 1, K L O'Neill 1, M W Thomas 1, P G McKenna 1, R W Blamey 1
PMCID: PMC1971480  PMID: 2223587

Abstract

The enzyme thymidine kinase is associated with DNA synthesis. Thymidine kinase serum levels were studied in normal controls (n = 20), patients with primary breast cancer (n = 60), patients with systemic breast cancer (n = 20) and as a non-cancer disease control group in patients with inflammatory gastrointestinal disorders (n = 20). Comparison of pretreatment values in the cancer patients with the normal controls showed a significant difference between the three groups in relation to stage of disease: mean values 4.22 (+/- 1.08), 6.22 (+/- 2.24) and 9.79 (+/- 7.56) pmol ml-1 h-1 for normal controls, operable breast cancer and systemic breast cancer respectively (P less than 0.005; analysis of variance). Patients with systemic breast cancer had a significantly elevated serum thymidine kinase level compared to controls (P less than 0.01) and patients with primary operable cancer (P less than 0.05). Patients with primary operable cancer had significantly higher serum thymidine kinase levels over normal controls (P less than 0.01). Mean serum TK in patients with inflammatory gastrointestinal diseases was similar to normal controls but significantly less than both patients with primary operable breast cancer and patients with systemic breast cancer. Twenty patients with operable breast cancer were followed up after primary surgery by serial 3-monthly thymidine kinase levels in the disease free interval. Four patients have developed systemic recurrence with a rise in the mean thymidine kinase value to 14.3 pmol ml-1 h-1. Ten patients with advanced breast cancer had serial thymidine kinase levels measured 2-monthly during the first 6 months of primary hormone therapy. The serum values fell in all five responders (mean 9.12-4.78 pmol ml-1 h-1) and rose in all five progressors (mean 8.62-38.5 pmol ml-1 h-1). Serum thymidine kinase reflects stage of disease in breast cancer. Serial thymidine kinase levels in patients with systemic breast cancer reflected response to systemic therapy.

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Selected References

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