Long-Term Outcome of Lobectomy for Thyroid Cancer

Area of Science:

• Endocrinology
• Oncology
• Surgical Oncology

Background:

• Recent American Thyroid Association (ATA) guidelines suggest lobectomy for low- to intermediate-risk thyroid tumors (≤40 mm) without extrathyroidal extension or lymph node metastases.
• This study evaluates long-term recurrence rates and associated factors following lobectomy for differentiated thyroid cancer.

Purpose of the Study:

• To assess the long-term recurrence of differentiated thyroid cancer after lobectomy.
• To identify factors influencing recurrence risk in patients treated with lobectomy.

Main Methods:

• Retrospective cohort study of 295 patients undergoing thyroid lobectomy between 1970 and 2010.
• Analysis of pathology-confirmed recurrence rates, stratified by tumor size (≤40 mm vs. >40 mm).

Main Results:

• Overall recurrence rate was 13.6% over a mean follow-up of 19.1 years, with 55% of recurrences detected >10 years post-surgery.
• Tumors >40 mm were associated with higher recurrence rates (20.6% vs. 7.3%) and lower remission rates (85.3% vs. 96.9%).
• Aggressive histology and intermediate risk category also correlated with increased locoregional or metastatic recurrence.

Conclusions:

• Thyroid cancer treated with lobectomy demonstrates a very good long-term outcome, particularly for tumors ≤40 mm.
• A prolonged follow-up period is essential to detect late recurrences after lobectomy for differentiated thyroid cancer.