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Clinicopathological and molecular characterisation of 'multiple-classifier' endometrial carcinomas

The Journal of pathology, 2020-03, Vol.250 (3), p.312 [Peer Reviewed Journal]

2019 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of Pathological Society of Great Britain and Ireland. ;ISSN: 1096-9896 ;EISSN: 1096-9896 ;DOI: 10.1002/path.5373 ;PMID: 31829447

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Title:
Clinicopathological and molecular characterisation of 'multiple-classifier' endometrial carcinomas
Author: León-Castillo, Alicia ; Gilvazquez, Ester ; Nout, Remi ; Smit, Vincent Thbm ; McAlpine, Jessica N ; McConechy, Melissa ; Kommoss, Stefan ; Brucker, Sara Y ; Carlson, Joseph W ; Epstein, Elisabeth ; Rau, Tilman T ; Soslow, Robert A ; Ganesan, Raji ; Matias-Guiu, Xavier ; Oliva, Esther ; Harrison, Beth T ; Church, David N ; Gilks, C Blake ; Bosse, Tjalling
Subjects: Adult ; Aged ; Aged, 80 and over ; Biomarkers, Tumor - genetics ; Carcinoma, Endometrioid - genetics ; Carcinoma, Endometrioid - metabolism ; Carcinoma, Endometrioid - pathology ; Endometrial Neoplasms - genetics ; Endometrial Neoplasms - metabolism ; Endometrial Neoplasms - pathology ; Female ; Humans ; Medicin och hälsovetenskap ; Middle Aged ; Mutation ; Prognosis
Is Part Of: The Journal of pathology, 2020-03, Vol.250 (3), p.312
Description: Endometrial carcinoma (EC) molecular classification based on four molecular subclasses identified in The Cancer Genome Atlas (TCGA) has gained relevance in recent years due to its prognostic utility and potential to predict benefit from adjuvant treatment. While most ECs can be classified based on a single classifier (POLE exonuclease domain mutations - POLEmut, MMR deficiency - MMRd, p53 abnormal - p53abn), a small but clinically relevant group of tumours harbour more than one molecular classifying feature and are referred to as 'multiple-classifier' ECs. We aimed to describe the clinicopathological and molecular features of multiple-classifier ECs with abnormal p53 (p53abn). Within a cohort of 3518 molecularly profiled ECs, 107 (3%) tumours displayed p53abn in addition to another classifier(s), including 64 with MMRd (MMRd-p53abn), 31 with POLEmut (POLEmut-p53abn), and 12 with all three aberrations (MMRd-POLEmut-p53abn). MMRd-p53abn ECs and POLEmut-p53abn ECs were mostly grade 3 endometrioid ECs, early stage, and frequently showed morphological features characteristic of MMRd or POLEmut ECs. 18/28 (60%) MMRd-p53abn ECs and 7/15 (46.7%) POLEmut-p53abn ECs showed subclonal p53 overexpression, suggesting that TP53 mutation was a secondary event acquired during tumour progression. Hierarchical clustering of TCGA ECs by single nucleotide variant (SNV) type and somatic copy number alterations (SCNAs) revealed that MMRd-p53abn tumours mostly clustered with single-classifier MMRd tumours (20/23) rather than single-classifier p53abn tumours (3/23), while POLEmut-p53abn tumours mostly clustered with single-classifier POLEmut tumours (12/13) and seldom with single-classifier p53abn tumours (1/13) (both p ≤ 0.001, chi-squared test). Finally, the clinical outcome of patients with MMRd-p53abn and POLEmut-p53abn ECs [stage I 5-year recurrence-free survival (RFS) of 92.2% and 94.1%, respectively] was significantly different from single-classifier p53abn EC (stage I RFS 70.8%, p = 0.024 and p = 0.050, respectively). Our results support the classification of MMRd-p53abn EC as MMRd and POLEmut-p53abn EC as POLEmut. © 2019 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of Pathological Society of Great Britain and Ireland.
Publisher: England
Language: English
Identifier: ISSN: 1096-9896
EISSN: 1096-9896
DOI: 10.1002/path.5373
PMID: 31829447
Source: SWEPUB Freely available online

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Clinicopathological and molecular characterisation of 'multiple-classifier' endometrial carcinomas

2019 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of Pathological Society of Great Britain and Ireland. ;ISSN: 1096-9896 ;EISSN: 1096-9896 ;DOI: 10.1002/path.5373 ;PMID: 31829447

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