Multicompartment metabolism in papillary thyroid cancer

Area of Science:

• Oncology
• Metabolic Research
• Thyroid Cancer Biology

Background:

• Tumor regions can exhibit metabolic heterogeneity and compartmentalization, influencing cancer aggressiveness.
• Metabolic coupling between tumor compartments can promote aggressive cancer behavior.
• Tumor metabolism in papillary thyroid cancer (PTC) remains poorly understood.

Purpose of the Study:

• To investigate the metabolic phenotype of papillary thyroid cancer (PTC).
• To explore the potential role of metabolic markers in predicting PTC disease progression.

Main Methods:

• Immunohistochemical staining was performed on 46 PTC specimens, comparing them to noncancerous thyroid tissue and benign thyroid specimens.
• Staining for translocase of outer mitochondrial membrane 20 (TOMM20), a marker of oxidative phosphorylation, and monocarboxylate transporter 4 (MCT4), a marker of glycolysis, was analyzed.
• Correlation between marker expression and advanced disease (presence of lateral neck lymphadenopathy) was assessed.

Main Results:

• Papillary thyroid cancer (PTC) and follicular adenoma (FA) thyrocytes showed high TOMM20 staining compared to noncancerous thyroid (NCT) and nodular goiter (NG) tissues.
• High MCT4 staining in fibroblasts was significantly more common in advanced PTC than in other tissue types.
• Low fibroblast MCT4 staining in PTC correlated with the absence of clinical adenopathy, extrathyroidal extension, and lower risk scores (ATA, AGES).

Conclusions:

• The study suggests the existence of multiple metabolic compartments within PTC.
• Low fibroblast MCT4 expression may serve as a biomarker for indolent papillary thyroid cancer (PTC).
• Understanding tumor metabolic phenotypes can aid in predicting disease behavior.