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Background. Papillary thyroid carcinoma (PTC) with central lymph node metastases (CLNMs) is common. The objective of this study was to investigate the incidence and risk factors of lymph node metastasis patients with PTC. Patients and Methods. Between January 2013 and February 2015, a retrospective study of 543 patients with PTC undergoing hemithyroidectomy or total thyroidectomy with routine central lymph node dissection (CLND) was analyzed. Clinicopathologic risk factors for CLNM were studied using univariate and multivariate analysis by SPSS 22.0 software. Results. The incidence of CLNMs in PTC patients was 38.1% (207/543). In the multivariate analysis, male gender (p<0.001, OR: 1.984), age <45 years (p<0.001, OR: 1.934), bilaterality (p=0.006, OR: 1.585), tumor size ≥0.25 cm (p=0.001, OR: 7.655), and external extension (p=0.001, OR: 7.579) were independent risk factors of CLNMs. Furthermore, in PTC patients with tumor size <0.25 cm, all 7 males and 21 patients with unilaterality were not found to have CLNMs. Conclusions. CLNMs are prevalent in the PTC patients with the following risk factors: male gender, age <45 years, bilaterality, tumor size ≥0.25 cm, and external extension. PTC patients with tumor size <0.25 cm, male patients, and patients with unilateral lesion could be considered safe from CLNMs.

A Study on Central Lymph Node Metastasis in 543 cN0 Papillary Thyroid Carcinoma Patients