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The DOI matches its Crossref record; 43 of the 43 references it cites were found in a registry or an index.

Interpretation of somatic POLE mutations in endometrial carcinoma

Open access
León‐Castillo, Alicia, Britton, Heidi, McConechy, Melissa K, McAlpine, Jessica N, Nout, Remi, Kommoss, Stefan, Brucker, Sara Y, Carlson, Joseph W, Epstein, Elisabeth, Rau, Tilman T, Bosse, Tjalling, Church, David N, Gilks, C Blake·2020·The Journal of Pathology

Abstract

Pathogenic somatic missense mutations within the DNA polymerase epsilon (POLE) exonuclease domain define the important subtype of ultramutated tumours (‘POLE‐ultramutated’) within the novel molecular classification of endometrial carcinoma (EC). However, clinical implementation of this classifier requires systematic evaluation of the pathogenicity of POLE mutations. To address this, we examined base changes, tumour mutational burden (TMB), DNA microsatellite instability (MSI) status, POLE variant frequency, and the results from six in silico tools on 82 ECs with whole‐exome sequencing from The Cancer Genome Atlas (TCGA). Of these, 41 had one of five known pathogenic POLE exonuclease domain mutations (EDM) and showed characteristic genomic alterations: C>A substitution > 20%, T>G substitutions > 4%, C>G substitutions < 0.6%, indels < 5%, TMB > 100 mut/Mb. A scoring system to assess these alterations (POLE‐score) was developed; based on their scores, 7/18 (39%) additional tumours with EDM were classified as POLE‐ultramutated ECs, and the six POLE mutations present in these tumours were considered pathogenic. Only 1/23 (4%) tumours with non‐EDM showed these genomic alterations, indicating that a large majority of mutations outside the exonuclease domain are not pathogenic. The infrequent combination of MSI‐H with POLE EDM led us to investigate the clinical significance of this association. Tumours with pathogenic POLE EDM co‐existent with MSI‐H showed genomic alterations characteristic of POLE‐ultramutated ECs. In a pooled analysis of 3361 ECs, 13 ECs with DNA mismatch repair deficiency (MMRd)/MSI‐H and a pathogenic POLE EDM had a 5‐year recurrence‐free survival (RFS) of 92.3%, comparable to previously reported POLE‐ultramutated ECs. Additionally, 14 cases with non‐pathogenic POLE EDM and MMRd/MSI‐H had a 5‐year RFS of 76.2%, similar to MMRd/MSI‐H, POLE wild‐type ECs, suggesting that these should be categorised as MMRd, rather than POLE‐ultramutated ECs for prognostication. This work provides guidance on classification of ECs with POLE mutations, facilitating implementation of POLE testing in routine clinical care. © 2019 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of Pathological Society of Great Britain and Ireland.

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Crossref · 10.1002/path.5372

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Metadata

Authors
León‐Castillo, A., Britton, H., McConechy, M. K., McAlpine, J. N., Nout, R., Kommoss, S., Brucker, S. Y., Carlson, J. W., Epstein, E., Rau, T. T., Bosse, T., Church, D. N., & Gilks, C. B.
Venue
The Journal of Pathology
Publisher
Wiley
Published
2020-01-29
Volume
250
Issue
3
Pages
323-335
ISSN
  • 0022-3417 (ISSN-L)
  • 1096-9896
OpenAlex
W2996314623
Cited by
409
References
43
FWCI
28.48
Type
journal article
Language
en
Open access
hybrid

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