Monitoring drug-induced gammaH2AX as a pharmacodynamic biomarker in individual circulating tumor cells.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
Lihua H WangRobert Kinders

Abstract

Circulating tumor cells (CTC) in peripheral blood of patients potentially represent a fraction of solid tumor cells available for more frequent pharmacodynamic assessment of drug action than is possible using tumor biopsy. However, currently available CTC assays are limited to cell membrane antigens. Here, we describe an assay that directly examines changes in levels of the nuclear DNA damage marker gammaH2AX in individual CTCs of patients treated with chemotherapeutic agents. An Alexa Fluor 488-conjugated monoclonal gammaH2AX antibody and epithelial cancer cell lines treated with topotecan and spiked into whole blood were used to measure DNA damage-dependent nuclear gammaH2AX signals in individual CTCs. Time-course changes in both CTC number and gammaH2AX levels in CTCs were also evaluated in blood samples from patients undergoing treatment. The percentage of gammaH2AX-positive CTCs increased in a concentration-dependent manner in cells treated with therapeutically relevant concentrations of topotecan ex vivo. In samples from five patients, percent gammaH2AX-positive cells increased post-treatment from a mean of 2% at baseline (range, 0-6%) to a mean of 38% (range, 22-64%) after a single day of drug administration; this increa...Continue Reading

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