Abstract
Stromal tumour infiltrating lymphocytes (sTIL) in haematoxylin and eosin (H&E) stained sections has been linked to better outcomes and better responses to neoadjuvant therapy in triple-negative and HER2-positive breast cancer (TNBC and HER2 +). However, the infiltrate includes different cell populations that have specific roles in the tumour immune microenvironment. Various studies have found high concordance between sTIL visual quantification and computational assessment, but specific data on the individual prognostic impact of plasma cells or lymphocytes within sTIL on patient prognosis is still unknown. In this study, we validated a deep-learning breast cancer sTIL scoring model (smsTIL) based on the segmentation of tumour cells, benign ductal cells, lymphocytes, plasma cells, necrosis, and ‘other’ cells in whole slide images (WSI). Focusing on HER2 + and TNBC patient samples, we assessed the concordance between sTIL visual scoring and the smsTIL in 130 WSI. Furthermore, we analysed 175 WSI to correlate smsTIL with clinical data and patient outcomes. We found a high correlation between sTIL values scored visually and semi-automatically (R = 0.76; P = 2.2e-16). Patients with higher smsTIL had better overall survival (OS) in TNBC (P = 0.0021). In the TNBC cohort, smsTIL was as an independent prognostic factor for OS. As part of this work, we introduce a new segmentation dataset of H&E-stained WSI.
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Data availability
Data on anonymized tiles and ground truth segmentations of breast cancer whole slide image sections have been deposited into the open-source database Zenodo (10.5281/zenodo.7775365).
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Acknowledgements
The authors would like to acknowledge Xavier Duran for his statistical guidance.
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This research was funded by Rio Hortega post-residency grant, Instituto de Salud Carlos III CM20/00019 and supported by grants from Instituto de Salud Carlos III/FEDER (PT17/0015/0011) and the ‘Xarxa de Bancs de tumors’ sponsored by Pla Director d’Oncologia de Catalunya (XBTC).
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Conceptualization: MG, JG, LC and IV. Methodology: MG, JG, PS, JS, PG, JM, LC and IV. Formal analysis and investigation: MG, JG, LC and IV. Writing-original draft preparation: MG and JG. Writing-review and editing: LC, IV, BB, BL and JA. Funding acquisition: MG, LC and JA.
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This study was approved by the Ethics Commission of Hospital del Mar (2020/794537/I). Biological samples were obtained from ‘Parc de Salut MAR Biobank (MARBiobanc)’(Barcelona).
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Gonzàlez-Farré, M., Gibert, J., Santiago-Díaz, P. et al. Automated quantification of stromal tumour infiltrating lymphocytes is associated with prognosis in breast cancer. Virchows Arch 483, 655–663 (2023). https://doi.org/10.1007/s00428-023-03608-4
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DOI: https://doi.org/10.1007/s00428-023-03608-4