1094 – Prognostic value of androgen receptor expression in triple-negative breast cancer: a systematic review and meta-analysis

Resumo

Introduction: Triple-negative breast cancer (TNBC) is an aggressive subtype characterized by the absence of estrogen
receptor, progesterone receptor, and human epidermal growth factor receptor 2 (HER2) expression, with limited therapeutic options. TNBC exhibits high tumor heterogeneity and a worse prognosis, including early metastasis, and high
recurrence and mortality rates. In this context, the expression of androgen receptor (AR) has been suggested as a potential prognostic biomarker in TNBC. ARs are steroid-dependent transcription factors, able to modulate cell proliferation,
apoptosis, and tumor invasion, and may be associated with overall survival and disease-free survival in TNBC.
Objective: To investigate the prognostic value of AR in TNBC, as assessed by immunohistochemistry, through a systematic review and meta-analysis.
Methods: A systematic review was conducted according to PRISMA 2020, with a protocol registered in PROSPERO
(CRD420261347726). Data were obtained from the PubMed/MEDLINE database, including 14 studies from the last ten
years. Kaplan–Meier curves were reconstructed using Guyot’s algorithm. Random-effects meta-analysis with 95% confidence interval (CI) was used to assess the prevalence of AR positivity. Heterogeneity was analyzed using I², with a leaveone-out sensitivity analysis. Publication bias was assessed using funnel plots and Egger’s test, and risk of bias was assessed
using the Joanna Briggs Institute criteria, with analyses performed in R 4.5.2 software.
Results: The 14 studies were included in the meta-analysis (n=1,922), and AR expression was positive in 36.6% of the cases
(95%CI 29.99–43.20; I²=92.5%). Kaplan–Meier curves demonstrated worse disease-free survival (p=0.03) and overall survival (p<0.001) in AR+ TNBC patients. Sensitivity analyses confirmed the robustness of the findings, and Egger’s test did
not indicate publication bias (p=0.53).
Conclusion: AR expression in TNBC was associated with worse overall and disease-free survival, reinforcing its role as
a potential prognostic biomarker in risk stratification and possibly guiding individualized therapeutic strategies.
Ethics: Public data – Literature review.
Registry: International Prospective Register of Systematic Reviews (PROSPERO), CRD420261347726.