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Tumour-infiltrating lymphocytes (TILs)-related genomic signature predicts chemotherapy response in breast cancer.

Abstract：

PURPOSE:The present study evaluated whether morphological-measured stromal and intra-tumour tumour-infiltrating lymphocytes (TILs) levels were associated with gene expression profiles, and whether TILs-associated genomic signature (GS) could be used to predict clinical outcomes and response to therapies in several breast cancer subtypes. METHODS:We retrospectively evaluated haematoxylin eosin (HE)-TILs levels and gene expression profiling data from 40 patients with primary breast cancer and extracted the 22 overexpressed genes in cases with high TILs scores as the TILs-GS. The TILs-GS were compared with breast cancer subtype and were evaluated predictive values for prognosis and response to therapies. RESULTS:Higher TILs-GS expressions were observed for triple-negative and human epidermal growth factor receptor 2 (HER2) positive (+) breast cancers, compared to the luminal types (P < 0.001). With the exception of HER2+, the TILs-GS had no prognostic value in subtypes of breast cancers. The Wilcoxon test revealed significantly different TILs-GS levels between the cases with pathological complete response (pCR) and residual disease after anthracycline and taxane-based neoadjuvant chemotherapy, with the exception of the luminal-low proliferation subtype. In the multivariate analysis, pCR was independently associated with smaller tumour size, higher histological grade, ER negativity, HER2 positivity and higher TILs-GS scores (OR 2.02, 95% CI 1.30-3.14, P = 0.025). CONCLUSIONS:TILs-GS was associated with stromal and intra-tumour TILs levels, as evaluated using HE, which predicted prognosis and chemotherapy response in several breast cancer subtypes. Further studies are needed to perform stratification according to TILs-GS levels and the conventional breast cancer subtypes.

journal_name

Breast Cancer Res Treat

journal_title

Breast cancer research and treatment

authors

Kochi M,Iwamoto T,Niikura N,Bianchini G,Masuda S,Mizoo T,Nogami T,Shien T,Motoki T,Taira N,Tokuda Y,Doihara H,Matsuoka J,Fujiwara T

doi

10.1007/s10549-017-4502-3

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

39-47

issue

1

eissn

0167-6806

issn

1573-7217

pii

10.1007/s10549-017-4502-3

journal_volume

167

pub_type

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