Abstract
Gastric gland mucin-specific O-glycans are unique in having α1,4-linked N-acetylglucosamine (αGlcNAc) attached to MUC6. We previously reported decreased expression of αGlcNAc relative to MUC6 in gastric and pancreatic neoplasms, but its significance in cervical glandular lesions remained unclear. Here, we analyzed MUC5AC, MUC6, αGlcNAc, and p16 expression in 9 lesions of mucinous carcinoma, gastric type with minimal deviation adenocarcinoma (GAS-MDA), 5 of GAS with nonMDA (GAS-nonMDA), 14 of typical lobular endocervical gland hyperplasia (LEGH), and 5 of atypical LEGH (33 total lesions). All 33 were MUC5AC-positive. Moreover, all 14 typical LEGH, 5 atypical LEGH, 8 of 9 GAS-MDA, and 3 of 5 GAS-nonMDA were MUC6-positive. All 14 typical LEGH, 2 of 5 atypical LEGH, 3 of 9 GAS-MDA, and 1 of 5 GAS-nonMDA were αGlcNAc-positive. The proportion of αGlcNAc-positive atypical LEGH or GAS-MDA or GAS-nonMDA lesions was significantly smaller than that seen in typical LEGH lesions (P < 0.001 and P < 0.01, respectively). Of 33 lesions, 32 were p16-negative. Furthermore, when we evaluated MUC6 and αGlcNAc immunoreactivity semi-quantitatively in all 33 lesions, in typical LEGH and GAS-MDA, the immunohistochemical score for αGlcNAc was significan...Continue Reading
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