Objective: Mucoepidermoid carcinoma (MEC) is the most common salivary gland malignancy, with a proportion harboring MAML2 rearrangement. This study evaluates the diagnostic and prognostic utility of MAML2 rearrangement in MEC.
Study Design: Salivary gland malignancies at a single institution (1989-2014) were reviewed to identify MECs. Histopathologic evaluation, immunohistochemistry, and fluorescent in situ hybridization (FISH) were performed.
Results: Forty-one cases of MEC were identified, with mean age of 47 years and mean tumor size of 21 mm. Seven locoregional recurrences and five MEC-related deaths were seen over a 22-year follow-up period. Thirty-eight cases were suitable for FISH, and 31 (82%) cases were positive for MAML2 rearrangement, including the oncocytic and clear cell variants of MEC. FISH was negative in the morphologic mimics of MEC. MAML2 rearrangement was significantly associated with longer survival.
Conclusions: MAML2 rearrangement is common and specific for MEC, which makes it a useful diagnostic tool. MAML2 rearrangement also predicts a favorable prognosis.
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Article Synopsis
- * Recent research used advanced genetic sequencing techniques to uncover a new fusion gene (CRTC1::MAML2) and a surprising rearrangement of the MAML2 gene to MYBL1, hinting at MYBL1's potential role in salivary gland cancers.
- * The study also found that TERT gene rearrangements and amplifications are common in MEC tumors, with TERT playing a crucial role in tumor growth, as demonstrated
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