Latero-cervical lymph node metastases (N1b) represent an additional risk factor for papillary thyroid cancer outcome

Area of Science:

• Oncology
• Endocrinology
• Surgical Pathology

Background:

• Papillary thyroid carcinoma (PTC) is the most common thyroid malignancy.
• While generally having a good prognosis, the impact of lymph node (LN) metastasis location on PTC outcomes remains debated.
• Accurate prognostic assessment is vital for effective patient management.

Purpose of the Study:

• To investigate the clinical significance of the number and location of lymph node metastases in papillary thyroid carcinoma.
• To determine if LN metastasis location influences disease recurrence and distant metastasis rates.
• To assess the utility of LN status for post-surgical risk stratification in PTC.

Main Methods:

• Retrospective analysis of 1653 PTC patients treated at a referral center.
• Patients were categorized based on lymph node status: N0 (no metastasis), N1a (central compartment), and N1b (latero-cervical compartment).
• Follow-up averaged 5.9 years, with data on disease persistence, recurrence, and distant metastases collected.

Main Results:

• Latero-cervical LN metastasis (N1b) was associated with younger age at diagnosis and a higher male prevalence.
• Persistent/recurrent disease was significantly more frequent in N1b (29.8%) and N1a (14.3%) compared to N0 (4.2%).
• Distant metastases were markedly higher in N1b (14.1%) than N1a (4.3%) and N0 (1.6%).

Conclusions:

• Latero-cervical lymph node metastasis (N1b) in PTC is linked to increased risks of disease persistence, recurrence, and distant spread.
• The location of lymph node metastases, specifically latero-cervical involvement, is a significant factor for post-surgical risk stratification.
• Incorporating LN metastasis location into risk assessment can improve management strategies for papillary thyroid carcinoma.