Evaluating the Rising Incidence of Thyroid Cancer and Thyroid Nodule Detection Modes: A Multinational,...

Area of Science:

• Endocrinology
• Oncology
• Epidemiology

Background:

• Increasing incidence of thyroid cancer may be linked to enhanced detection of subclinical disease.
• A true increase in thyroid cancer incidence is also suggested, potentially indicated by more symptomatic patients.

Purpose of the Study:

• To assess changes in modes of detection (MODs) for thyroid nodules requiring surgery.
• To determine geographic variations in MODs for thyroid nodules.

Main Methods:

• Retrospective analysis of 1328 patients undergoing thyroid surgery across 16 centers in 4 countries (Canada, Denmark, South Africa, US).
• MODs classified as endocrine condition, symptomatic, surveillance, or asymptomatic (further categorized).
• Data collected for patients having surgery in 2019.

Main Results:

• Thyroid cancer was detected in 46% of patients (613/1328).
• Most cancers (51%) were found in asymptomatic patients, averaging 2.1 cm, compared to symptomatic cancers (30%) averaging 3.2 cm.
• Significant differences in MOD patterns were observed among the participating countries.

Conclusions:

• The majority of thyroid cancers are discovered incidentally in asymptomatic individuals, often resulting in smaller tumors.
• Despite this trend, large asymptomatic thyroid cancers can still occur.
• Substantial geographic variations in MODs indicate diverse clinical practices for managing thyroid findings.