Correlation of metabolism/hypoxia markers and fluorodeoxyglucose uptake in oral squamous cell carcinomas.

OBJECTIVE

The objective of this study was to analyze the relationship between the uptake of (18)F-2-fluoro-2-deoxy-d-glucose (FDG) by positron emission tomography-computerized tomography (PET-CT) and glucose metabolism/hypoxia markers in oral squamous cell carcinoma (OSCC).

STUDY DESIGN

Thirty-six patients with OSCC (tongue [n = 23], buccal mucosa [n = 7], and floor of the mouth [n = 6]) were assessed and underwent incisional biopsy and subsequently received FDG-PET-CT. Expressions of hypoxia-inducible factor 1α (HIF-1α), glucose transporter protein 1 (GLUT-1), hexokinase-II (HK-II), and glucose-6-phosphatase (G6Pase) were immunohistochemically quantified, and FDG uptake was evaluated by the maximum standardized uptake values (SUV(max)) at the primary tumor site.

RESULTS

FDG uptake was found to be significantly correlated with the T classification of OSCC but not with other clinicopathologic characteristics, such as the N classification, clinical type, and histologic grade of malignancy. In the early-stage (T1 and T2) tumor, FDG uptake was significantly associated with the expression levels of GLUT-1, HK II, and HIF-1α, and the expression levels of GLUT-1 and HK-II significantly correlated with HIF-1α expression levels. However, there were no correlations between the expression levels of these molecules and SUV(max) in the late-stage (T3 and T4) tumor.

CONCLUSIONS

FDG uptake was significantly associated with the expression levels of glucose metabolism-related molecules, such as GLUT-1, HK II, and HIF-1α, especially in early-stage tumors.