Poster display session: Breast cancer - early stage, locally advanced & metastatic, CNS tumours, Developmental therapeutics, Genitourinary tumours - prostate & non-prostate, Palliative care, Psycho-oncology, Public health policy, Sarcoma, Supportive care Poster Display session

206P - TNBC universe: a monocentric retrospective analyses of TILs and AR as prognostic markers

Presentation Number
206P
Lecture Time
12:45 - 12:45
Speakers
  • Agnese Losurdo (Milan, IT)
Location
Hall A3 - Poster Area Networking Hub, ICM M√ľnchen, Munich, Germany
Date
22.10.2018
Time
12:45 - 13:45

Abstract

Background

TILs have been proposed as a prognostic biomarker in many tumor types both in the adjuvant and neoadjuvant setting. In TNBC, TILs are present at the highest level and have been demonstrated to be associated with better prognosis. TNBC is a highly diverse group of cancers and subtyping is necessary to better identify patient-tailored therapies. Cluster analysis by gene expression identified 6 TNBC subtypes among which the so called “luminal androgen receptor subtype”.

Methods

We retrospectively collected 160 early stage TNBC consecutively treated at our Institution from 2006 to 2015. Data were obtained for clinico-pathological patients' characteristics. On IHC archive slides we analyzed stromal TILs scored as a continuous variable and androgen receptor's (AR) percentage and intensity of expression. We performed Cox analyses for DFS and for OS, and we used chi-square and Fisher test to evaluate the correlation between TILs, AR and other clinical variables. To define high vs low TILs, an internal dataset cut-off of 10% was considered.

Results

150 patients were eligible for IHC analyses of TILs and AR. With a median follow-up of 6.5 years, 41 local and/or distant relapse events were observed and 28 patients died of disease. Interestingly, TILs were found to be significantly associated with nodal status (N0 vs N1-3), grading (G2 vs G3) and Ki-67 (<20% vs ≥ 20%) (p = 0.007, p = 0.055 and p = 0.002, respectively). AR was also significantly associated with proliferation, specifically AR-positive cases presented mostly with a Ki-67<20% (p = 0.008). Probably due to the paucity of events, no statistically significant association of TILs and AR with either DFS or OS was observed.

Conclusions

TILs are a promising prognostic marker, but still prospective validation is needed to integrate them into clinical practice. Among TNBC, the identification of AR-expressing luminal subtype might provide a targeted therapy chance for a low proliferation TNBC subtype. Larger prospective trials are likely to validate TILs prognostic role and to explore the universe of TNBC subtypes targeted therapies opportunities.

Legal entity responsible for the study

Istituto Clinico Humanitas.

Funding

Has not received any funding.

Disclosure

All authors have declared no conflicts of interest.

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