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Related Experiment Video

Updated: Jun 21, 2026

Computer-Aided Three-Dimensional Visualization in the Treatment of Locally Advanced Thyroid Cancer

Computer-Aided Three-Dimensional Visualization in the Treatment of Locally Advanced Thyroid Cancer

Published on: June 9, 2023

Need for a revised staging consensus in medullary thyroid carcinoma.

Sarah Y Boostrom¹, Clive S Grant, Geoffrey B Thompson

¹Department of Surgery, Mayo Clinic, Rochester, MN 55905, USA.

Archives of Surgery (Chicago, Ill. : 1960)

|July 22, 2009

Summary

The 2002 TNM staging system for medullary thyroid cancer is inadequate, particularly for stage IV. The 1997 TNM criteria better predict prognosis for medullary thyroid cancer patients.

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Area of Science:

Endocrinology
Oncology
Surgical Oncology

Background:

Prognosis assessment for medullary thyroid cancer (MTC) is challenging.
Current staging systems may not accurately reflect patient outcomes.
The TNM (Tumor, Node, Metastasis) staging system is crucial for cancer prognosis.

Purpose of the Study:

To compare the accuracy of the 1997 TNM staging criteria versus the 2002 TNM staging system for medullary thyroid cancer.
To evaluate the prognostic value of each staging system, particularly for advanced stages.

Main Methods:

Retrospective cohort study of 173 patients with surgically treated medullary thyroid cancer.
Patients were staged using both 1997 and 2002 TNM criteria.
Outcomes assessed included biochemical cure, clinical cure, and overall survival.

Main Results:

The 2002 TNM criteria classified a significantly higher proportion of patients as stage IV MTC compared to the 1997 criteria (33% vs 7%).
Five-year overall survival for stage IV MTC was notably lower with 1997 criteria (46%) versus 2002 criteria (82%).
Clinically cured patients, even those staged as IV by 2002 criteria, demonstrated excellent long-term survival.

Conclusions:

The 2002 TNM staging system for medullary thyroid cancer is inadequate, especially for stage IV disease.
Elevated but stable calcitonin levels in clinically cured patients do not necessarily indicate a poor prognosis.
Patients with lymph node metastases but no distant disease may be better classified as stage III under revised criteria.