PURPOSE: The aim of this study was to determine if glucose transporter-1 (Glut1) expression correlates with (18)F-FDG ((18)F-fluoro-2-deoxyglucose) uptake on positron emission tomography (PET) in lung cancer and to examine the similarities and differences between them. METHODS: A total of 34 patients with resected primary lung cancers were investigated in this study. There were 17 adenocarcinomas, 12 squamous cell carcinomas, and 5 cancers of other cell types. Immunohistochemical Glut1 intensity was categorized into three groups: negative, positive, and strongly positive. Glut1 frequency was defined by the proportion of positive cells among all cancer cells, and it was graded on a semiquantitative scale as 0-100% in 10% increments. The data are expressed as the mean +/- SD. RESULTS: Maximum standardized uptake values (SUVmax) were 4.8 +/- 6.3 in "negative" Glut1 intensity cases, 4.7 +/- 3.1 in "positive" Glut1 intensity cases, and 11.2 +/- 5.2 in "strongly positive" Glut1 intensity cases. Although SUVmax correlated significantly with tumor size (correlation coefficient 0.58, P = 0.00033), Glut1 frequency did not correlate significantly with tumor size (correlation coefficient 0.18, P = 0.301). Cell type and cell differentiation correlated significantly with Glut1 expression and (18)F-FDG uptake. CONCLUSION: Glut1 expression correlates significantly with (18)F-FDG uptake. There are similarities in cell differentiation and cell type between Glut1 expression and (18)F-FDG uptake. (18)F-FDG uptake correlates significantly with tumor size, but Glut1 expression does not.
PURPOSE: The aim of this study was to determine if glucose transporter-1 (Glut1) expression correlates with (18)F-FDG ((18)F-fluoro-2-deoxyglucose) uptake on positron emission tomography (PET) in lung cancer and to examine the similarities and differences between them. METHODS: A total of 34 patients with resected primary lung cancers were investigated in this study. There were 17 adenocarcinomas, 12 squamous cell carcinomas, and 5 cancers of other cell types. Immunohistochemical Glut1 intensity was categorized into three groups: negative, positive, and strongly positive. Glut1 frequency was defined by the proportion of positive cells among all cancer cells, and it was graded on a semiquantitative scale as 0-100% in 10% increments. The data are expressed as the mean +/- SD. RESULTS: Maximum standardized uptake values (SUVmax) were 4.8 +/- 6.3 in "negative" Glut1 intensity cases, 4.7 +/- 3.1 in "positive" Glut1 intensity cases, and 11.2 +/- 5.2 in "strongly positive" Glut1 intensity cases. Although SUVmax correlated significantly with tumor size (correlation coefficient 0.58, P = 0.00033), Glut1 frequency did not correlate significantly with tumor size (correlation coefficient 0.18, P = 0.301). Cell type and cell differentiation correlated significantly with Glut1 expression and (18)F-FDG uptake. CONCLUSION:Glut1 expression correlates significantly with (18)F-FDG uptake. There are similarities in cell differentiation and cell type between Glut1 expression and (18)F-FDG uptake. (18)F-FDG uptake correlates significantly with tumor size, but Glut1 expression does not.
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