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Birkeland E, Zhang S, Poduval D, Geisler J, Nakken S, Vodak D, Meza-Zepeda LA, Hovig E, Myklebost O, Knappskog S, Lønning PE. Patterns of genomic evolution in advanced melanoma. Nat Commun 2018; 9:2665. [PMID: 29991680 PMCID: PMC6039447 DOI: 10.1038/s41467-018-05063-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 06/07/2018] [Indexed: 01/30/2023] Open
Abstract
Genomic alterations occurring during melanoma progression and the resulting genomic heterogeneity between metastatic deposits remain incompletely understood. Analyzing 86 metastatic melanoma deposits from 53 patients with whole-exome sequencing (WES), we show a low branch to trunk mutation ratio and little intermetastatic heterogeneity, with driver mutations almost completely shared between lesions. Branch mutations consistent with UV damage indicate that metastases may arise from different subclones in the primary tumor. Selective gain of mutated BRAF alleles occurs as an early event, contrasting whole-genome duplication (WGD) occurring as a late truncal event in about 40% of cases. One patient revealed elevated mutational diversity, probably related to previous chemotherapy and DNA repair defects. In another patient having received radiotherapy toward a lymph node metastasis, we detected a radiotherapy-related mutational signature in two subsequent distant relapses, consistent with secondary metastatic seeding. Our findings add to the understanding of genomic evolution in metastatic melanomas. As melanoma progresses, it evolves. Here, in advanced melanoma the authors study genomic evolution, highlighting trunk mutations dominated by the ultraviolet damage signature, common late truncal whole-genome duplication events, as well as selective copy number gain of mutant BRAF.
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Affiliation(s)
- E Birkeland
- Section of Oncology, Department of Clinical Science, University of Bergen, 5020 Bergen, Norway.,Department of Oncology, Haukeland University Hospital, 5021 Bergen, Norway
| | - S Zhang
- Section of Oncology, Department of Clinical Science, University of Bergen, 5020 Bergen, Norway.,Department of Oncology, Haukeland University Hospital, 5021 Bergen, Norway
| | - D Poduval
- Section of Oncology, Department of Clinical Science, University of Bergen, 5020 Bergen, Norway.,Department of Oncology, Haukeland University Hospital, 5021 Bergen, Norway
| | - J Geisler
- Institute of Clinical Medicine, University of Oslo, Campus Akershus University Hospital, 1478 Lørenskog, Oslo, Norway.,Department of Oncology, Akershus University Hospital, 1478 Lørenskog, Norway
| | - S Nakken
- Department of Tumor Biology, Institute of Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, 0310 Oslo, Norway.,Norwegian Cancer Genomics Consortium, Institute for Cancer Research, Oslo University Hospital -Radium Hospital, 0310 Oslo, Norway
| | - D Vodak
- Department of Tumor Biology, Institute of Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, 0310 Oslo, Norway.,Norwegian Cancer Genomics Consortium, Institute for Cancer Research, Oslo University Hospital -Radium Hospital, 0310 Oslo, Norway
| | - L A Meza-Zepeda
- Department of Tumor Biology, Institute of Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, 0310 Oslo, Norway.,Norwegian Cancer Genomics Consortium, Institute for Cancer Research, Oslo University Hospital -Radium Hospital, 0310 Oslo, Norway.,Genomics Core Facility, Department of Core Facilities, Institute of Cancer Research, the Norwegian Radium Hospital, 0310 Oslo, Norway
| | - E Hovig
- Department of Tumor Biology, Institute of Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, 0310 Oslo, Norway.,Norwegian Cancer Genomics Consortium, Institute for Cancer Research, Oslo University Hospital -Radium Hospital, 0310 Oslo, Norway.,Department of Informatics, University of Oslo, 0316 Oslo, Norway.,Institute of Cancer Genetics and Informatics, The Norwegian Radium Hospital, Oslo University Hospital, 0310 Oslo, Norway
| | - O Myklebost
- Department of Tumor Biology, Institute of Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, 0310 Oslo, Norway.,Norwegian Cancer Genomics Consortium, Institute for Cancer Research, Oslo University Hospital -Radium Hospital, 0310 Oslo, Norway
| | - S Knappskog
- Section of Oncology, Department of Clinical Science, University of Bergen, 5020 Bergen, Norway.,Department of Oncology, Haukeland University Hospital, 5021 Bergen, Norway
| | - P E Lønning
- Section of Oncology, Department of Clinical Science, University of Bergen, 5020 Bergen, Norway. .,Department of Oncology, Haukeland University Hospital, 5021 Bergen, Norway.
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