Publication date: December 2017
Source:European Journal of Cancer, Volume 87
Author(s): Carmen Criscitiello, Vincenzo Bagnardi, Giancarlo Pruneri, Andrea Vingiani, Angela Esposito, Nicole Rotmensz, Giuseppe Curigliano
BackgroundThe 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 methodsHaematoxylin 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.ResultsTILs 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).ConclusionsTILs 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.
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