AccScience Publishing / AIH / Online First / DOI: 10.36922/AIH025470105
ORIGINAL RESEARCH ARTICLE

Predicting breast cancer prognosis using γδ T cell gene signatures

Jia Weng1 Jiacheng Weng2 Antony Kam1 Shining Loo3 Lina Zhou4 Rencai Fan5 Runwei Guan6* Shicheng Li7,8* Kai Chen9*
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1 Department of Biosciences and Bioinformatics, School of Science, Xi’an Jiaotong-Liverpool University, Suzhou, Jiangsu, China
2 Department of Oncology, Suzhou Xiangcheng People’s Hospital, Suzhou, Jiangsu, China
3 Wisdom Lake Academy of Pharmacy, Xi’an Jiaotong-Liverpool University, Suzhou, Jiangsu, China
4 Health Management Center, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
5 Department of Medical Oncology, Fujian Medical University Union Hospital, Fuzhou, Fujian, China
6 Thrust of Artificial Intelligence, Hong Kong University of Science and Technology (Guangzhou), Guangzhou, Guangdong, China
7 Computing Science and Artificial Intelligence College, Suzhou City University, Suzhou, Jiangsu, China
8 Department of Oncology, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
9 Department of Oncology, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
Received: 19 November 2025 | Revised: 29 December 2025 | Accepted: 12 January 2026 | Published online: 3 February 2026
(This article belongs to the Special Issue Artificial intelligence in reproductive health and pathology)
© 2026 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
Abstract

Gamma delta (γδ) T cells exert a pivotal anti-tumor role in the breast cancer (BC) tumor microenvironment, highlighting the importance of investigating their prognostic value for improved patient stratification. We analyzed single-cell ribonucleic acid sequencing data to cluster immune cells and identify marker genes. Prognostic features were selected using Least Absolute Shrinkage and Selection Operator regression in the Cancer Genome Atlas–Breast Invasive Carcinoma cohort and validated across five external Gene Expression Omnibus cohorts. The expression of these prognostic genes was further validated by immunohistochemistry (IHC) in an in-house cohort of BC patients. These selected features were used to construct machine learning models, with the best-performing model undergoing hyperparameter tuning to optimize its performance. γδ T cells were identified as one of the major immune cell populations in BC. Twelve γδ T cell-associated genes were selected based on their prognostic significance in external validation cohorts. The random forest (RF) model achieved the highest accuracy (0.835) after hyperparameter tuning. In external validation, the final model showed the highest performance with area under the curve/accuracy values of 0.81/0.849. IHC analysis confirmed dysregulated expression of key signature proteins in BC tissues. In conclusion, we developed an efficient prognostic RF model based on a 12-gene signature from γδ T cells, which may serve as a clinically valuable tool for risk stratification in BC patients.

Graphical abstract
Keywords
Breast cancer
γδ T cell
Single-cell sequencing
Machine learning
Prognosis prediction
Funding
This research was supported by the Postgraduate Research Scholarship (PGRS FOS2211JM02), Research Development Funding (RDF-22-02-002) from Xi’an Jiaotong-Liverpool University (Suzhou, China), the Gusu Health Talent Research Fund (GSWS2023097), the Second Affiliated Hospital of Soochow University Pre-research Project for Doctoral and Returned Overseas Students (SDFEYBS2210), and the Su-zhou Applied Basic Research Technology Innovation Project (SYW2024096).
Conflict of interest
The authors declare that they have no competing interests.
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