Introduction: Laryngeal squamous cell carcinoma (LSCC) is the most common type of laryngeal cancer, with around 60% of patients being diagnosed at an advanced stage. Recently, cancer-derived sialylated immunoglobulin G (SIA-IgG) has been suggested to play a role in the progression of various epithelial tumors, but its significance in LSCC remains unknown. This study aimed to investigate the clinical significance of SIA-IgG as a novel biomarker in relation to the initiation, progression, and prognostication of LSCC. Methods: Immunohistochemistry (IHC) was utilized to assess SIA-IgG expression in tumor samples from 75 LSCC patients, aiming to investigate its correlation with clinical prognosis. In vitro functional experiments were conducted to explore the impact of SIA-IgG expression on the proliferative and migratory abilities of laryngocarcinoma cells. Results: High expression of SIA-IgG was associated with pT stage, pN stage, TNM stage, and recurrence during follow-up and was correlated with poor disease-free survival (DFS) and overall survival (OS). Multivariate Cox analysis demonstrated that SIA-IgG served as an independent risk factor for OS and DFS. Knocking down SIA-IgG significantly weakened laryngocarcinoma cells’ proliferation, clonogenesis, and migration abilities. Conclusions: The frequent expression of SIA-IgG in LSCC is significantly associated with poor prognosis. High levels of SIA-IgG can enhance proliferation and migration in laryngocarcinoma cells. These findings suggest that SIA-IgG has potential as a novel biomarker for LSCC.

While cancer-derived sialylated immunoglobulin G (SIA-IgG) has been found to promote the development of various epithelial tumors, research on its role in laryngeal cancer remains blank. Therefore, the objective of this study is to investigate the correlation between LSCC expression and clinical prognosis as well as the proliferation and migration abilities of laryngeal cancer cells.

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