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Integrative Genetic Characterization and Phenotype Correlations in Pheochromocytoma and Paraganglioma Tumours
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Endocrine Surgery.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Endocrine Surgery.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Endocrine Oncology.
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2014 (English)In: PLoS ONE, ISSN 1932-6203, Vol. 9, no 1, e86756- p.Article in journal (Refereed) Published
Abstract [en]

Background: About 60% of Pheochromocytoma (PCC) and Paraganglioma (PGL) patients have either germline or somatic mutations in one of the 12 proposed disease causing genes; SDHA, SDHB, SDHC, SDHD, SDHAF2, VHL, EPAS1, RET, NF1, TMEM127, MAX and H-RAS. Selective screening for germline mutations is routinely performed in clinical management of these diseases. Testing for somatic alterations is not performed on a regular basis because of limitations in interpreting the results. Aim: The purpose of the study was to investigate genetic events and phenotype correlations in a large cohort of PCC and PGL tumours. Methods: A total of 101 tumours from 89 patients with PCC and PGL were re-sequenced for a panel of 10 disease causing genes using automated Sanger sequencing. Selected samples were analysed with Multiplex Ligation-dependent Probe Amplification and/or SNParray. Results: Pathogenic genetic variants were found in tumours from 33 individual patients (37%), 14 (16%) were discovered in constitutional DNA and 16 (18%) were confirmed as somatic. Loss of heterozygosity (LOH) was observed in 1/1 SDHB, 11/11 VHL and 3/3 NF1-associated tumours. In patients with somatic mutations there were no recurrences in contrast to carriers of germline mutations (P = 0.022). SDHx/VHL/ EPAS1 associated cases had higher norepinephrine output (P = 0.03) and lower epinephrine output (P<0.001) compared to RET/NF1/H-RAS cases. Conclusion: Somatic mutations are frequent events in PCC and PGL tumours. Tumour genotype may be further investigated as prognostic factors in these diseases. Growing evidence suggest that analysis of tumour DNA could have an impact on the management of these patients.

Place, publisher, year, edition, pages
2014. Vol. 9, no 1, e86756- p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-220300DOI: 10.1371/journal.pone.0086756ISI: 000330283100207OAI: oai:DiVA.org:uu-220300DiVA: diva2:705647
Available from: 2014-03-17 Created: 2014-03-12 Last updated: 2015-02-03Bibliographically approved
In thesis
1. Charting the Genetic Landscape and Clonal Architectures of Pheochromocytoma
Open this publication in new window or tab >>Charting the Genetic Landscape and Clonal Architectures of Pheochromocytoma
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Genotypic and phenotypic inter patient heterogeneity characterize pheochromocytoma and paraganglioma (PPGL). Up to 60% of PPGL are associated with either somatic or germline mutations in at least 14 established disease causing genes. Consequently, a comprehensive screening test for PPGL patients utilizing standard techniques is not feasible and in the diagnostic approach, multiple different phenotype guided gene prioritization protocols have been utilized. This may result in misdiagnosis, especially in patients with sporadic presentation. Diagnostic testing of somatic mutations in tumour material is not performed due to the lack of actionable results.

The aims of this study were, (1) to investigate the use of novel sequencing techniques in a clinical application, (2) to discover novel PPGL disease causing loci using novel sequencing techniques, (3) to characterize a large cohort of PPGL for mutations in known disease causing genes and to analyse corresponding genotype-phenotype correlations, (4) to dissect the molecular and genetic landscape of MEN2 PPGL and (5) to determine the clonal architecture and heterogeneity within, and in-between matched PPGL.

For these purposes we studied PPGL tumours from a total of 96 patients using targeted and/or whole exome enrichment, capillary and high throughput sequencing as well as genome wide array based genotyping. Novel bioinformatics pipelines were constructed for raw data processing and downstream interpretation. Quantitative PCR, western blot and immunohistochemistry were utilized in order to characterize molecular traits. Selected experimental findings were correlated to patient phenotype.

We conclude that novel sequencing techniques could be utilized in clinical genetic screening of patients with PPGL. Somatic gain-of-function mutations in H-RAS are likely to contribute to disease pathogenesis. Analysing tumour DNA for somatic mutations in disease causing genes could provide relevant clinical information and have an impact on patient management. Concomitant mutations in PPGL may occur in exceptional cases and have a substantial impact on tumour biology and patient phenotype. And finally genetic heterogeneity is present between and within a majority of PPGL tumours.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014. 57 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 1047
National Category
Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)
urn:nbn:se:uu:diva-234285 (URN)978-91-554-9084-3 (ISBN)
Public defence
2014-12-06, Auditorium Minus, Gustavianum, Akademigatan 3, Uppsala, 13:15 (English)
Available from: 2014-11-13 Created: 2014-10-15 Last updated: 2015-02-03

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