High number of chromosomal copy number aberrations inversely relates to t(11;19)(q21;p13) translocation status in mucoepidermoid carcinoma of the salivary glands

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Abstract

Although rare, mucoepidermoid carcinoma (MEC) is one of the most common malignant salivary gland tumors. The presence of the t(11;19)(q21;p13) translocation in a subset of MECs has raised interest in genomic aberrations in MEC. In the present study we conducted genome-wide copy-number-aberration analysis by micro-array comparative-genomic-hybridization on 27 MEC samples. Low/intermediate-grade MECs had significantly fewer copy-number-aberrations compared to high-grade MECs (low vs high: 3.48 vs 30; p = 0.0025; intermediate vs high: 5.7 vs 34.5; p = 0.036). The translocation-negative MECs contained more copynumber- aberrations than translocation-positive MECs (average amount of aberrations 15.9 vs 2.41; p =0.04). Within all 27 MEC samples, 16p11.2 and several regions on 8q were the most frequently gained regions, while 1q23.3 was the most frequently detected loss. Low/intermediate-grade MEC samples had copy-number-aberrations in chromosomes 1, 12 and 16, while high-grade MECs had a copy-number-aberration in 8p. The most commonly observed copy-number-aberration was the deletion of 3p14.1, which was observed in 4 of the translocation-negative MEC samples. No recurrent copy-number-aberrations were found in translocation-positive MEC samples. Based on these results, we conclude that MECs may be classified as follows: (i) t(11;19)(q21;p13) translocation-positive tumors with no or few chromosomal aberrations and (ii) translocation-negative tumors with multiple chromosomal aberrations.

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Matse, J. H., Veerman, E. C. I., Bolscher, J. G. M., Leemans, C. R., Ylstra, B., & Bloemena, E. (2017). High number of chromosomal copy number aberrations inversely relates to t(11;19)(q21;p13) translocation status in mucoepidermoid carcinoma of the salivary glands. Oncotarget, 8(41), 69456–69464. https://doi.org/10.18632/oncotarget.17282

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