GLUT1

GLUT1 (Glucose Transporter 1) is a protein on the surface of cells that moves glucose (sugar) from the bloodstream into the cell, where it is used for energy. Cancer cells often produce much more GLUT1 than normal cells because they consume sugar at a higher rate. Pathologists can stain tissue samples for GLUT1 to help tell cancerous cells apart from benign ones.

Origin

GLUT1 stands for "GLucose Transporter 1," the first member of the SLC2A family of glucose transport proteins to be cloned and sequenced, achieved by Mueckler and colleagues in 1985. It was originally characterized in human red blood cells.

Significance in Asbestos Context

GLUT1 is used as an immunohistochemical marker to help distinguish malignant mesothelioma and other cancers from benign reactive changes in the pleura. Reactive (non-cancerous) mesothelial cells, which can look worryingly abnormal under the microscope after asbestos exposure or pleural inflammation, are typically GLUT1-negative, while mesothelioma cells are usually GLUT1-positive. This stain is rarely used alone. Pathologists combine it with other markers (such as BAP1 loss and MTAP loss) to reach a confident diagnosis. For patients, GLUT1 results in the pathology report can be an important piece of evidence supporting a malignant diagnosis, which in turn supports a legal claim.

Example Sentence

The pathology report noted that the pleural biopsy cells were strongly positive for GLUT1, supporting the diagnosis of malignant mesothelioma rather than benign reactive pleuritis.

Related Terms

Immunohistochemistry, BAP1, MTAP, Mesothelioma, Reactive Mesothelial Hyperplasia, Pleural Biopsy

Notes

• Ask your pathologist or oncologist which immunohistochemical stains were performed on your biopsy. GLUT1, BAP1, MTAP, calretinin, and others are commonly used together to confirm mesothelioma.
• Request a copy of the full pathology report (not just the summary); the specific markers tested and their results can matter for both treatment planning and a legal claim.
• If the initial biopsy was inconclusive, ask whether GLUT1 and other discriminating stains were run, or whether a second-opinion review at a mesothelioma specialty center is warranted.
• GLUT1 is not specific to mesothelioma. Many cancers express it, so its value lies in distinguishing malignant from benign cells in the right clinical context.