Study of serum leptin in well-differentiated thyroid carcinoma: correlation with patient and tumor characteristics.

There was a trend for preoperative serum leptin levels to be higher in patients with cervical lymph node metastasis—34.25 (1.50–109.60) ng/ml—compared to those without lymph node metastasis—19.25 (4.20–44.80) ng/ml, however did not reach statistical significance ( p = 0.480).

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A positive trend was also apparent between the size of the tumor and preoperative leptin level; however, it did not reach a significant value ( p = 0.079; Fig. 3 ).

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