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Tumor evolution and progression in multifocal and paired non-invasive/invasive urothelial carcinoma

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Abstract

Although multifocal tumors and non-invasive/invasive components are commonly encountered in surgical pathology, their genetic relationship is often poorly characterized. We used next-generation sequencing (NGS) to characterize somatic alterations in a patient with five spatially distinct, high-grade papillary urothelial carcinomas (UCs), with one tumor harboring an underlying invasive component. NGS of 409 cancer-related genes was performed on DNA isolated from formalin-fixed paraffin-embedded (FFPE) blocks representing each papillary tumor (n = 5), the invasive component of one tumor, and matched normal tissue. We identified nine unique non-synonymous somatic mutations across the six UC samples, including five present in each carcinoma sample, consistent with clonal origin and limited intertumoral heterogeneity. Copy number and loss of heterogeneity (LOH) profiles were similar in all six carcinomas; however, the invasive carcinoma component uniquely showed focal CDKN2A loss and chromosome 9 LOH and did not harbor gains of chromosomes 5p or X that were present in the other tumor samples. Phylogenetic analysis supported the invasive component arising from a shared progenitor prior to the outgrowth of cells in the non-invasive tumors. Results were extended to three additional cases of upper tract UC with paired non-invasive/invasive components, which identified driving alterations exclusive to both non-invasive and invasive components. Lastly, we performed targeted RNA sequencing (RNAseq) using a custom bladder cancer panel, which confirmed gene expression signature differences between paired non-invasive/invasive components. The results and approaches presented here may be useful in understanding the clonal relationships in multifocal cancers or paired non-invasive/invasive components from routine FFPE specimens.

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Acknowledgments

The authors thank Mandy Davis and Angela Fullen for technical assistance and Arul Chinnaiyan and Eric Fearon for critical review of the manuscript. This work was supported by the University of Michigan, Department of Anatomic Pathology Operations Committee (to JIW and SAT) and generous gifts from the Teeter and MacLeod families for bladder cancer research at the University of Michigan.

Conflict of interest

SAT has a separate sponsored research agreement with Compendia Bioscience/Life Technologies. None of the study described herein was supported by Compendia Bioscience/Life Technologies, and they had no role in the data collection, interpretation, or analysis and did not participate in the study design or the decision to submit for publication. All authors have no disclosures or conflicts of interest otherwise.

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Correspondence to Scott A. Tomlins.

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Joshua I. Warrick and Daniel H. Hovelson contributed equally to this manuscript.

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Warrick, J.I., Hovelson, D.H., Amin, A. et al. Tumor evolution and progression in multifocal and paired non-invasive/invasive urothelial carcinoma. Virchows Arch 466, 297–311 (2015). https://doi.org/10.1007/s00428-014-1699-y

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  • DOI: https://doi.org/10.1007/s00428-014-1699-y

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