Background: The diagnosis of malignant diseases worldwide has been determined using F-fluorodeoxyglucose positron emission tomography (FDG-PET). Glucose transporter type 1 (Glut-1) is a key protein associated with the accumulation of FDG in cancer cells. This study evaluated the relationship between Glut-1 expression and FDG accumulation to determine the usefulness of FDG-PET for prediction of long-term outcomes of pancreatic cancer.
Methods: The expression of Glut-1 was immunohistochemically examined in 138 surgically resected pancreatic cancer specimens. The Glut-1-positive and Glut-1-negative groups were analyzed with respect to their clinicopathologic characteristics and prognosis. Before surgery, 93 patients underwent FDG-PET and measurement of the corrected maximum standardized uptake value (cSUVmax). The relationship between Glut-1 expression and cSUVmax were examined, and prognostic factors were identified using uni- and multivariate analyses.
Results: Glut-1 was positive in 69 patients (50%). The median relapse-free and overall survival times were significantly shorter in the Glut-1-positive group (11 vs. 22 months, respectively) than in the Glut-1-negative group (23 vs. 42 months, respectively). The cSUVmax was significantly associated with long-term survival. The relapse-free and overall survival rates were significantly poorer in the high-cSUVmax group than in the low-cSUVmax group. Glut-1 expression was associated with cSUVmax accumulation. In the multivariate Cox regression analysis using forward stepwise selection, male gender, positive lymph node metastases, high CA19-9, and high cSUVmax were identified as independent prognostic factors for pancreatic cancer.
Conclusion: A significant relationship exists between high preoperative cSUVmax and Glut-1 expression. High cSUVmax is one of the prognostic factors for overall survival after resection of pancreatic cancer.
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