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. 2023 Mar;128(7):1360-1368.
doi: 10.1038/s41416-023-02141-0. Epub 2023 Jan 23.

Prognostic refinement of NSMP high-risk endometrial cancers using oestrogen receptor immunohistochemistry

Collaborators, Affiliations

Prognostic refinement of NSMP high-risk endometrial cancers using oestrogen receptor immunohistochemistry

Lisa Vermij et al. Br J Cancer. 2023 Mar.

Abstract

Background: Risk-assessment of endometrial cancer (EC) is based on clinicopathological factors and molecular subgroup. It is unclear whether adding hormone receptor expression, L1CAM expression or CTNNB1 status yields prognostic refinement.

Methods: Paraffin-embedded tumour samples of women with high-risk EC (HR-EC) from the PORTEC-3 trial (n = 424), and a Dutch prospective clinical cohort called MST (n = 256), were used. All cases were molecularly classified. Expression of L1CAM, ER and PR were analysed by whole-slide immunohistochemistry and CTNNB1 mutations were assessed with a next-generation sequencing. Kaplan-Meier method, log-rank tests and Cox's proportional hazard models were used for survival analysis.

Results: In total, 648 HR-EC were included. No independent prognostic value of ER, PR, L1CAM, and CTNNB1 was found, while age, stage, and adjuvant chemotherapy had an independent impact on risk of recurrence. Subgroup-analysis showed that only in NSMP HR-EC, ER-positivity was independently associated with a reduced risk of recurrence (HR 0.33, 95%CI 0.15-0.75).

Conclusions: We confirmed the prognostic impact of the molecular classification, age, stage, and adjuvant CTRT in a large cohort of high-risk EC. ER-positivity is a strong favourable prognostic factor in NSMP HR-EC and identifies a homogeneous subgroup of NSMP tumours. Assessment of ER status in high-risk NSMP EC is feasible in clinical practice and could improve risk stratification and treatment.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1. Recurrence-free survival for patients with NSMP high-risk endometrial cancer by ER and PR expression.
Kaplan–Meier survival curves of patients with NSMP high-risk endometrial cancer for recurrence-free survival by ER and PR expression.
Fig. 2
Fig. 2. Histopathological and molecular characteristics of NSMP high-risk endometrial cancers.
Histopathological and molecular landscape depicting ER and PR status, the most frequently mutated genes, histotype and grade assignment and L1CAM status of NSMP high-risk endometrial cancers (n = 161) with successful ER, PR and L1CAM immunohistochemistry and next-generation sequencing. IHC immunohistochemistry.
Fig. 3
Fig. 3. Incorporation of ER status in the molecular classification of endometrial cancer.
a Addition of a fourth step into the WHO diagnostic algorithm of the endometrial cancer (EC) molecular classification, including ER immunohistochemistry in NSMP EC. b Recurrence-free survival Kaplan–Meier curves of patients with high-risk endometrial cancer.

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