Predicting outcome and directing therapy for papillary thyroid carcinoma

Area of Science:

• Endocrinology
• Oncology
• Surgical Oncology

Background:

• Papillary thyroid carcinoma (PTC) prognosis is stratified into low- and high-risk groups.
• Age is a critical factor in stratifying high-risk PTC patients, influencing prognosis and treatment decisions.

Purpose of the Study:

• To evaluate the long-term survival outcomes for papillary thyroid carcinoma patients based on risk stratification.
• To determine the impact of age, surgical extent, lymph node dissection, and radioactive iodine therapy on PTC prognosis.

Main Methods:

• Retrospective study of 727 papillary thyroid cancer patients treated between 1940 and 1998 at a tertiary care center.
• Patients were stratified into low- and high-risk groups based on age, metastases, tumor extent, and size.
• High-risk patients were further divided into younger (<60 years) and older (≥60 years) subgroups to assess treatment effects on survival.

Main Results:

• High-risk PTC patients (19.5%) had significantly lower 20-year survival (61.3%) compared to low-risk patients (97.8%).
• Within the high-risk group, older patients (≥60 years) had poorer survival (45.1%) than younger patients (72.3%).
• Older high-risk patients demonstrated improved survival with bilateral thyroidectomy (54.7% vs 25.0%) and lymph node dissection (72.4% vs 30.2%). Radioactive iodine did not significantly impact survival across risk groups.

Conclusions:

• Papillary thyroid carcinoma in low-risk patients has a favorable prognosis irrespective of treatment modality.
• Older high-risk PTC patients benefit significantly from total thyroidectomy and lymph node dissection, improving survival outcomes.
• Radioactive iodine therapy did not demonstrate a significant impact on 20-year survival in any patient risk group.