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Published in: Breast Cancer Research and Treatment 3/2020

01-12-2020 | Breast Cancer | Epidemiology

Assessment of stromal tumor infiltrating lymphocytes and immunohistochemical features in invasive micropapillary breast carcinoma with long-term outcomes

Authors: Frederik Deman, Kevin Punie, Annouschka Laenen, Patrick Neven, Eva Oldenburger, Ann Smeets, Ines Nevelsteen, Chantal Van Ongeval, Adinda Baten, Timothy Faes, Melissa Christiaens, Hilde Janssen, Caroline Weltens, Christine Desmedt, Hans Wildiers, Giuseppe Floris

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

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Abstract

Purpose

We studied the long-term outcomes of invasive micropapillary carcinoma (IMPCs) of the breast in relation to stromal tumor infiltrating lymphocytes (sTILs), prognostic biomarkers and clinicopathological features.

Methods

Stage I-III IMPCs treated with upfront surgery at our institution (January 2000 and December 2016) were included. Central pathology review was performed and sTILs (including zonal distribution and hot spot analysis) and tumor-associated plasma cells (TAPC) were evaluated. Expression of P53, BCL2, FOXP3, and WT1, which are variably linked to breast cancer prognosis, was measured by immunohistochemistry using tissue microarrays. Time-to-event endpoints were distant recurrence free interval (DRFI) and breast cancer-specific survival (BCSS).

Results

We included 111 patients of whom 59% were pure IMPCs. Standard clinicopathological features were comparable between pure and non-pure IMPCs. Overall, the mean sTILs level was 20% with higher proportion of sTILs present at the invasive front. There were no significant differences between pure- and non-pure IMPCs in sTILs levels, nor in the spatial distribution of the hot spot regions or in the distribution of TAPC. Higher sTILs correlated with worse DRFI (HR = 1.55; p = 0.0172) and BCSS (HR = 2.10; p < 0.001).

Conclusions

Clinicopathological features, geographical distribution of sTILs and TAPC are similar between pure and non-pure IMPCs. Despite a high proportion of grade 3 tumors and lymph node involvement, we observed a low rate of distant recurrences and breast cancer-related death in this cohort of stage I-III IMPCs treated with primary surgery. Caution in interpretation of the observed prognostic correlations is required given the very low number of events, warranting validation in other cohorts.
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Metadata
Title
Assessment of stromal tumor infiltrating lymphocytes and immunohistochemical features in invasive micropapillary breast carcinoma with long-term outcomes
Authors
Frederik Deman
Kevin Punie
Annouschka Laenen
Patrick Neven
Eva Oldenburger
Ann Smeets
Ines Nevelsteen
Chantal Van Ongeval
Adinda Baten
Timothy Faes
Melissa Christiaens
Hilde Janssen
Caroline Weltens
Christine Desmedt
Hans Wildiers
Giuseppe Floris
Publication date
01-12-2020
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/s10549-020-05913-x

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