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GLUT4 immunohistochemical (A) and 18F-FDG PET (B) studies of patient with primary gastric GIST before and 8 wk after imatinib mesylate therapy. GLUT4 intense brown staining at baseline is no longer apparent on week 8 surgical specimen. 18F-FDG PET images show intense 18F-FDG uptake in the gastric mass before treatment and resolution at week 8.
