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Published in: Breast Cancer Research and Treatment 3/2020

Open Access 01-10-2020 | Breast Cancer | Epidemiology

Prognostic value of histopathological DCIS features in a large-scale international interrater reliability study

Authors: Emma J. Groen, Jan Hudecek, Lennart Mulder, Maartje van Seijen, Mathilde M. Almekinders, Stoyan Alexov, Anikó Kovács, Ales Ryska, Zsuzsanna Varga, Francisco-Javier Andreu Navarro, Simonetta Bianchi, Willem Vreuls, Eva Balslev, Max V. Boot, Janina Kulka, Ewa Chmielik, Ellis Barbé, Mathilda J. de Rooij, Winand Vos, Andrea Farkas, Natalja E. Leeuwis-Fedorovich, Peter Regitnig, Pieter J. Westenend, Loes F. S. Kooreman, Cecily Quinn, Giuseppe Floris, Gábor Cserni, Paul J. van Diest, Esther H. Lips, Michael Schaapveld, Jelle Wesseling, Grand Challenge PRECISION consortium

Published in: Breast Cancer Research and Treatment | Issue 3/2020

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Abstract

Purpose

For optimal management of ductal carcinoma in situ (DCIS), reproducible histopathological assessment is essential to distinguish low-risk from high-risk DCIS. Therefore, we analyzed interrater reliability of histopathological DCIS features and assessed their associations with subsequent ipsilateral invasive breast cancer (iIBC) risk.

Methods

Using a case-cohort design, reliability was assessed in a population-based, nationwide cohort of 2767 women with screen-detected DCIS diagnosed between 1993 and 2004, treated by breast-conserving surgery with/without radiotherapy (BCS ± RT) using Krippendorff’s alpha (KA) and Gwet’s AC2 (GAC2). Thirty-eight raters scored histopathological DCIS features including grade (2-tiered and 3-tiered), growth pattern, mitotic activity, periductal fibrosis, and lymphocytic infiltrate in 342 women. Using majority opinion-based scores for each feature, their association with subsequent iIBC risk was assessed using Cox regression.

Results

Interrater reliability of grade using various classifications was fair to moderate, and only substantial for grade 1 versus 2 + 3 when using GAC2 (0.78). Reliability for growth pattern (KA 0.44, GAC2 0.78), calcifications (KA 0.49, GAC2 0.70) and necrosis (KA 0.47, GAC2 0.70) was moderate using KA and substantial using GAC2; for (type of) periductal fibrosis and lymphocytic infiltrate fair to moderate estimates were found and for mitotic activity reliability was substantial using GAC2 (0.70). Only in patients treated with BCS-RT, high mitotic activity was associated with a higher iIBC risk in univariable analysis (Hazard Ratio (HR) 2.53, 95% Confidence Interval (95% CI) 1.05–6.11); grade 3 versus 1 + 2 (HR 2.64, 95% CI 1.35–5.14) and a cribriform/solid versus flat epithelial atypia/clinging/(micro)papillary growth pattern (HR 3.70, 95% CI 1.34–10.23) were independently associated with a higher iIBC risk.

Conclusions

Using majority opinion-based scores, DCIS grade, growth pattern, and mitotic activity are associated with iIBC risk in patients treated with BCS-RT, but interrater variability is substantial. Semi-quantitative grading, incorporating and separately evaluating nuclear pleomorphism, growth pattern, and mitotic activity, may improve the reliability and prognostic value of these features.
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Metadata
Title
Prognostic value of histopathological DCIS features in a large-scale international interrater reliability study
Authors
Emma J. Groen
Jan Hudecek
Lennart Mulder
Maartje van Seijen
Mathilde M. Almekinders
Stoyan Alexov
Anikó Kovács
Ales Ryska
Zsuzsanna Varga
Francisco-Javier Andreu Navarro
Simonetta Bianchi
Willem Vreuls
Eva Balslev
Max V. Boot
Janina Kulka
Ewa Chmielik
Ellis Barbé
Mathilda J. de Rooij
Winand Vos
Andrea Farkas
Natalja E. Leeuwis-Fedorovich
Peter Regitnig
Pieter J. Westenend
Loes F. S. Kooreman
Cecily Quinn
Giuseppe Floris
Gábor Cserni
Paul J. van Diest
Esther H. Lips
Michael Schaapveld
Jelle Wesseling
Grand Challenge PRECISION consortium
Publication date
01-10-2020
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 3/2020
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-020-05816-x

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