Correlation Between Preoperative Neutrophil-to-Lymphocyte Ratio and Clinicopathological Characteristics of Papillary Thyroid Carcinomas: Toward a Preoperative Biomarker.

Introduction: Papillary thyroid carcinoma (PTC) is the most common type of thyroid cancer, with considerable variability in its clinical presentation and prognosis. Recent studies have focused on the relationship between its clinicopathological characteristics and inflammatory biomarkers, particularly the preoperative neutrophil-to-lymphocyte ratio (NLR). Our aim was to investigate the correlation between NLR and the clinicopathological features of PTC. Methods: This was a retrospective study. We involved patients who underwent surgery for PTC over a 5-year period from January 2016 to December 2021. Based on the mean NLR value, the study population was divided into 2 groups, with Group 1 corresponding to patients with an elevated NLR. Results: Our study included 102 patients aged between 20 and 83 years. All patients were euthyroid. The mean preoperative NLR was 2.01 ± 0.62, with 53% of patients classified into Group 1. On ultrasound, most nodules were classified as EU-TIRADS 5, and 38% had a Bethesda category 6 cytology. Final histopathological analysis revealed microcarcinoma in the majority of cases. PTC was multifocal in 35 cases and bilateral in 38, with an aggressive histological variant observed in 45 cases. Multivariate analysis demonstrated a statistically significant correlation between NLR and extrathyroidal invasion, lymph node metastasis, aggressive histological subtypes, and multifocality. Conclusion: NLR is a readily accessible and cost-effective preoperative biomarker. Its use could improve risk stratification and support personalized therapeutic strategies. However, prospective studies with larger, multicenter cohorts are required to validate NLR as a reliable predictive biomarker.