Multifocal Versus Solitary Papillary Thyroid Carcinoma

Area of Science:

• Endocrinology
• Oncology
• Pathology

Background:

• Papillary Thyroid Carcinoma (PTC) is the most common thyroid cancer, often presenting as a single tumor or multiple foci (Multifocal PTC).
• Understanding the differences between solitary and multifocal PTC is crucial for effective treatment and prognosis.

Purpose of the Study:

• To compare the clinical characteristics and outcomes of solitary versus multifocal Papillary Thyroid Carcinoma.
• To identify factors associated with the aggressiveness of Multifocal PTC.

Main Methods:

• A retrospective analysis of 647 PTC patients diagnosed between January 2008 and December 2012.
• Comparison of demographics, tumor characteristics (size, foci number, histology), TNM staging, and lymph node (LN) metastasis between solitary and MFPTC groups.
• Analysis of the correlation between foci number, gender, age, and LN involvement.

Main Results:

• Multifocal PTC (MFPTC) was diagnosed in 37.2% of patients (241/647).
• MFPTC patients exhibited more advanced T stage (28.2% vs. 18.7%) and higher rates of lymph node metastasis (28.6% vs. 15.5%) compared to solitary PTC.
• Foci number in MFPTC correlated with male gender and lymph node metastasis. Central/lateral lymph node involvement was strongly associated with male gender and younger age.

Conclusions:

• Multifocal Papillary Thyroid Carcinoma represents a more aggressive subtype of PTC, associated with advanced disease (T3/T4) and increased lymph node metastasis (N1a/N1b).
• The number of tumor foci in MFPTC is a significant indicator of male gender and lymph node metastasis, highlighting its prognostic importance.