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Fluorescence In Situ Hybridization Analysis Of Circulating Tumor Cells In Metastatic Prostate Cancer

M. Leversha, J. Han, Z. Asgari, D. Danila, O. Lin, Rita Gonzalez-Espinoza, A. Anand, H. Lilja, G. Heller, M. Fleisher, H. Scher
Published 2009 · Biology, Medicine

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Purpose: To assess the feasibility of characterizing gene copy number alteration by fluorescence in situ hybridization (FISH) of circulating tumor cells (CTC) isolated using the CellSearch system in patients with progressive castration-resistant metastatic prostate cancer. Experimental Design: We used probe combinations that included the androgen receptor (AR) and MYC genes for FISH analysis of CTC samples collected from 77 men with castration-resistant metastatic prostate cancer. Results: High-level chromosomal amplification of AR was detected in 38% and relative gain of MYC in 56% of samples analyzed. No such abnormalities were detected in samples with CTC counts of <10, reflecting ascertainment difficulty in these lower count samples. Conclusion: The CTC isolated from our patient cohort present a very similar molecular cytogenetic profile to that reported for late-stage tumors and show that FISH analysis of CTC can be a valuable, noninvasive surrogate for routine tumor profiling. That as many as 50% of these patients have substantial amplification of the AR locus indicates that androgen signaling continues to play an important role in late-stage prostate cancer.
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