Identification of GZMA as a Potential Therapeutic Target Involved in Immune Infiltration in Breast Cancer by Integrated Bioinformatical Analysis

Granzyme A (GZMA) is a potential prognostic target for various cancer types. However, its therapeutic significance in breast cancer with immune infiltration remains controversial. We analyzed expression and its prognostic value in breast cancer with immune cell infiltration. Data was obtained from patients with breast cancer registered at The Cancer Genome Atlas. A correlation was performed between expression and patient's clinicopathological features such as age, pathologic stage, metastasis stage, overall survival (OS), disease-specific survival (DSS), and progress free interval (PFI). Kaplan-Meier analyses and Cox proportional hazard regression model were used to examine the predictive significance of expression for breast cancer. The co-expression pattern of was assessed by the LinkedOmics web portal. The relationship between expression and immune cells was analyzed using the TIMER database. The correlation between and lymphocytes and immunomodulators was established with the TISIDB database. There was a lower expression in breast cancer tissue than in normal tissue. Interestingly, expression was associated with age, pathologic stage, and the Tumour, Node, and Metastasis stage. Overexpression of was also associated with better OS, DSS, and PFI. Based on the Cox regression analysis, was identified as an independent favorable prognostic factor for breast cancer. Our findings demonstrated a strong association between and T-cell checkpoints (PD-1, PD-L1, and cytotoxic T lymphocyte-associated antigen (CTLA-4)) in breast cancer. Moreover, we evaluated the interactions between expression and markers of dendritic and CD8+ T cells using quantitative immunofluorescence. We discovered that increased infiltration of dendritic and CD8+ T cells was associated with expression in breast cancer. expression is associated with a favorable prognosis in breast cancer and is significantly correlated with immune cell infiltration. may be considered a promising therapeutic target for patients with breast cancer.