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Background The presence of central lymph node metastases (CLNM) has been suggested as a risk factor for poorer prognosis and recurrence in papillary thyroid microcarcinoma (PTMC). However, the clinicopathologic factors for CLNM in clinical node-negative (CN0) PTMC were not well defined. This study aimed to perform a systematic review and meta-analysis to investigate the significant clinicopathologic predictors of CLNM in CN0 PTMC. Methods A systematic literature search was performed in PubMed, Embase, Cochrane Library, and Web of Science. Case-control studies on the association of clinicopathologic risk factors with CLNM in CN0 PTMC were included. Results Thirteen eligible studies involving 6068 patients with CN0 PTMC were included. From the pooled analyses, male (odds ratio [OR]: 2.07, 95%  CI : 1.49–2.87,  P    5 mm ( OR : 1.84, 95%  CI : 1.55–2.18,  P  &lt; 0.001), and extrathyroidal extension ( OR : 1.96, 95%  CI : 1.30–2.95,  P  = 0.001) are significantly associated with increased risk of CLNM in CN0 PTMC. A sample size with a cutoff point of 200 was identified as the source of heterogeneity for sex according to meta-regression ( t  = 3.18,  P  = 0.033). Then, the subgroup analysis of male was performed, which illustrated that male increased the risk of CLNM in the small sample group (SG) and the large sample group (LG) by 6.11-folds and 2.01-folds, respectively (SG:  OR , 6.11, 95%  CI , 3.16–11.81,  P  &lt; 0.001; LG:  OR , 2.01, 95%  CI , 1.65–2.46,  P  &lt; 0.001). Conclusions Male, multifocality, tumor size &gt; 5 mm, and extrathyroidal extension may be reliable clinical predictors of CLNM in CN0 PTMC. Moreover, prophylactic central lymph node dissection should be considered in surgical decision-making for CN0 PTMC patients, who are male, multifocal, with tumor size &gt; 5 mm, and with extrathyroidal extension. Trial registration CRD42021242211  (PROSPERO)

world journal of surgical oncology

Clinicopathologic predictors of central lymph node metastases in clinical node-negative papillary thyroid microcarcinoma: a systematic review and meta-analysis