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Journal Article
Research Support, Non-U.S. Gov't
Immunohistochemical staining of GLUT1 in benign, borderline, and malignant ovarian epithelia.
Cancer 2002 Februrary 16
BACKGROUND: Aberrant expression of the facilitative glucose transporter GLUT1 is found in a wide spectrum of epithelial malignancies. The authors describe an immunohistochemical study of GLUT1 expression in benign, borderline, and malignant ovarian epithelia.
METHODS: One hundred forty one formalin-fixed, paraffin-embedded sections were immunostained with rabbit anti-GLUT1 using the streptavidin-biotin method. The samples were as follows: 3 endometriotic cysts, 9 serous cystadenomas, 15 mucinous cystadenomas, 17 noninvasive borderline implants, 3 invasive borderline implants, and 3 endosalpingiosis. In addition, 35 borderline tumors (26 serous, 7 mucinous, 2 seromucinous) and 56 adenocarcinomas (50 serous, 4 endometrioid, 2 mucinous) were stained.
RESULTS: Benign serous and mucinous cystadenomas and endosalpingiosis were non-staining with GLUT1 antiserum. Twenty-eight of 35 borderline tumors (80%) stained positively, with weak to moderate (1-2+ out of 3) staining intensity and focal or patchy distribution. Seventeen noninvasive serous borderline implants were negatively stained; however, three invasive serous borderline implants were positively stained with GLUT1 antiserum. Fifty four of 56 ovarian carcinomas (96%) stained positively, with moderate to strong (2-3+ out of 3) intensity and multifocal distribution.
CONCLUSIONS: GLUT1 is a consistent marker of ovarian epithelial malignancy. GLUT1 staining is absent in benign ovarian epithelial tumors, and shows progressively more staining in invasive tumors as compared to borderline tumors. Anti-GLUT1 antibody may be useful in distinguishing invasive from noninvasive serous borderline implants.
METHODS: One hundred forty one formalin-fixed, paraffin-embedded sections were immunostained with rabbit anti-GLUT1 using the streptavidin-biotin method. The samples were as follows: 3 endometriotic cysts, 9 serous cystadenomas, 15 mucinous cystadenomas, 17 noninvasive borderline implants, 3 invasive borderline implants, and 3 endosalpingiosis. In addition, 35 borderline tumors (26 serous, 7 mucinous, 2 seromucinous) and 56 adenocarcinomas (50 serous, 4 endometrioid, 2 mucinous) were stained.
RESULTS: Benign serous and mucinous cystadenomas and endosalpingiosis were non-staining with GLUT1 antiserum. Twenty-eight of 35 borderline tumors (80%) stained positively, with weak to moderate (1-2+ out of 3) staining intensity and focal or patchy distribution. Seventeen noninvasive serous borderline implants were negatively stained; however, three invasive serous borderline implants were positively stained with GLUT1 antiserum. Fifty four of 56 ovarian carcinomas (96%) stained positively, with moderate to strong (2-3+ out of 3) intensity and multifocal distribution.
CONCLUSIONS: GLUT1 is a consistent marker of ovarian epithelial malignancy. GLUT1 staining is absent in benign ovarian epithelial tumors, and shows progressively more staining in invasive tumors as compared to borderline tumors. Anti-GLUT1 antibody may be useful in distinguishing invasive from noninvasive serous borderline implants.
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