The clinical value of Delphian and pre-tracheal lymph nodes in predicting lateral lymph nodes metastasis of papillary thyroid carcinoma.

BACKGROUND

Occult lymph node metastasis of papillary thyroid carcinoma is common. However, whether undergoing prophylactic lateral lymph node dissections is still controversial. This cross-sectional study with large cohort of patients aims to investigate the clinical value of Delphian and pre-tracheal lymph node in predicting lateral lymph node metastasis of papillary thyroid carcinoma.

MATERIALS AND METHODS

A retrospective analysis was conducted on 865 papillary thyroid carcinoma patients with Delphian and pre-tracheal lymph node data who underwent thyroidectomy plus central and lateral lymph node dissection. Data on clinicopathological characteristics were collected. Subsequently, a predictive model was established based on the results of the univariate and multivariate analyses.

RESULTS

The rates of Delphian and pre-tracheal lymph node metastasis and lateral lymph node metastasis were 54.7% and 39.1%, respectively. Having ≥ 3 or 1-2 Delphian and pre-tracheal lymph node metastasis dramatically increased the risk of lateral lymph node metastasis (OR = 8.5, 95% CI 5.3-13.4 and OR = 3.9, 95% CI 2.7-5.7, respectively). The upper tumour had a 3.7 times higher risk of lateral lymph node metastasis than other locations. Patients ≤ 42 years or tumour size >8 mm had a higher risk of lateral lymph node metastasis.

CONCLUSIONS

Delphian and pre-tracheal lymph node metastasis was associated positively with the risk of lateral lymph node metastasis. For patients without clinical lateral lymph node metastasis, the Delphian and pre-tracheal lymph node could be considered to harvest as the first step in a thyroidectomy to facilitate further conduct of the operation.