4.7 Article

Prognostic value of tumour-infiltrating lymphocytes in small HER2-positive breast cancer

Journal

EUROPEAN JOURNAL OF CANCER
Volume 87, Issue -, Pages 164-171

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ejca.2017.10.011

Keywords

Tumour-infiltrating lymphocytes; HER2; Stage pT1a-b breast cancer

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Funding

  1. ERA-NET: TRANSCAN-2 research funding

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Background: The standard treatment for patients with small, node-negative, human epidermal growth factor receptor type 2 (HER2)-positive breast cancer (BC) is still controversial. Our aim was to assess the prognostic role of tumour-infiltrating lymphocytes (TILs) in patients with stage pT1a-b HER2-positive BC. Patients and methods: Haematoxylin and eosin slides from node-negative, pT1a-b HER2-positive BC surgical specimens were retrieved from pathology archives to assess TILs and their association with outcome. Results: TILs were evaluated in 205 patients with HER2-positive, pT1a-b tumours, who underwent breast surgery between 1997 and 2009 at the European Institute of Oncology. At a median follow-up of 11 years, we did not observe any association between the presence of TILs, either assessed as a continuous or dichotomous variable (<50 versus >= 50%), and outcome. Within the subgroup of patients with pT1a tumours who did not receive any adjuvant therapy (36/97 patients), the rate of disease-free survival events was lower in lymphocyte-predominant BC (LPBC) as compared with non-LPBC patients (p = 0.066). Conclusions: TILs cannot be used as a prognostic biomarker in pT1a-b HER2-positive BC. Additional biomarkers are needed for selecting patients with stage I HER2-positive BC who candidate to adjuvant therapy de-escalation. (C) 2017 Elsevier Ltd. All rights reserved.

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