The prevalence and clinical relevance of tumor-infiltrating lymphocytes (TILs) in ductal carcinoma in situ of the breast

Tumor-infiltrating lymphocytes (TILs) are a robust prognostic adjunct in invasive breast cancer, but their clinical role in ductal carcinoma in situ (DCIS) has not been ascertained. We evaluated the prevalence and clinical relevance of TILs in a well annotated series of 1488 consecutive DCIS women w...

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Veröffentlicht in:Annals of oncology 2017-02, Vol.28 (2), p.321-328
Hauptverfasser: Pruneri, G., Lazzeroni, M., Bagnardi, V., Tiburzio, G.B., Rotmensz, N., DeCensi, A., Guerrieri-Gonzaga, A., Vingiani, A., Curigliano, G., Zurrida, S., Bassi, F., Salgado, R., Van den Eynden, G., Loi, S., Denkert, C., Bonanni, B., Viale, G.
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container_issue 2
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container_title Annals of oncology
container_volume 28
creator Pruneri, G.
Lazzeroni, M.
Bagnardi, V.
Tiburzio, G.B.
Rotmensz, N.
DeCensi, A.
Guerrieri-Gonzaga, A.
Vingiani, A.
Curigliano, G.
Zurrida, S.
Bassi, F.
Salgado, R.
Van den Eynden, G.
Loi, S.
Denkert, C.
Bonanni, B.
Viale, G.
description Tumor-infiltrating lymphocytes (TILs) are a robust prognostic adjunct in invasive breast cancer, but their clinical role in ductal carcinoma in situ (DCIS) has not been ascertained. We evaluated the prevalence and clinical relevance of TILs in a well annotated series of 1488 consecutive DCIS women with a median follow-up of 8.2years. Detailed criteria for TILs evaluation were pre-defined involving the International Immuno-Oncology Biomarker Working Group. TILs percentage was considered both as a continuous and categorical variable. Levels of TILs were examined for their associations with ipsilateral breast event (IBE), whether in situ or invasive. Of the 1488 patients with DCIS under study, 35.1% had 
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We evaluated the prevalence and clinical relevance of TILs in a well annotated series of 1488 consecutive DCIS women with a median follow-up of 8.2years. Detailed criteria for TILs evaluation were pre-defined involving the International Immuno-Oncology Biomarker Working Group. TILs percentage was considered both as a continuous and categorical variable. Levels of TILs were examined for their associations with ipsilateral breast event (IBE), whether in situ or invasive. Of the 1488 patients with DCIS under study, 35.1% had &lt;1%, 58.3% 1–49% and 6.5% ≥50% peri-ductal stromal lymphocytes. The interobserver agreement in TILs evaluation, measured by the intraclass correlation coefficient (ICC) was 0.96 (95% CI 0.95–0.97). At univariable analysis, clinical factors significantly associated with TILs (P ≤0.001) were intrinsic subtype, grade, necrosis, type of surgery. Her-2 positive DCIS were more frequently associated with TILs (24% of patients with TILs ≥50%), followed by the triple negative (11%), Luminal B/Her-2 positive (9%) and Luminal A/B subtypes (1%) (P &lt; 0.0001). We did not find any association between TILs as a continuous variable and the risk of IBEs. Likewise, when patients were stratified by TILs percentage (&lt;1%, between 1% and 49.9%, and ≥50%), no statistically significant association was observed (10-year cumulative incidence of IBEs: 19%, 17.3%, and 18.7% respectively, P = 0.767). TILs occur more frequently in the Her-2 positive DCIS. 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subjects Adult
Aged
Breast Neoplasms - epidemiology
Breast Neoplasms - immunology
Breast Neoplasms - pathology
Breast Neoplasms - therapy
Carcinoma, Intraductal, Noninfiltrating - epidemiology
Carcinoma, Intraductal, Noninfiltrating - immunology
Carcinoma, Intraductal, Noninfiltrating - pathology
Carcinoma, Intraductal, Noninfiltrating - therapy
ductal carcinoma in situ
Female
Humans
Lymphocytes, Tumor-Infiltrating - pathology
Middle Aged
Neoplasm Recurrence, Local - epidemiology
Neoplasm Recurrence, Local - immunology
Neoplasm Recurrence, Local - prevention & control
Prevalence
Prognosis
Proportional Hazards Models
tumor infiltrating lymphocytes
title The prevalence and clinical relevance of tumor-infiltrating lymphocytes (TILs) in ductal carcinoma in situ of the breast
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