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Mammary analogue secretory carcinoma of salivary gland origin (MASC)

Wednesday 15 January 2014

Mammary analogue secretory carcinoma of salivary gland origin (MASC) is a recently described tumor resembling secretory carcinoma of the breast characterized by strong S-100 protein, mammaglobin, and vimentin immunoexpression and which harbors a t(12;15) (p13;q25) translocation resulting in ETV6-NTRK3 fusion product.

Histologically, conventional MASC displays bland histomorphology and a lobulated growth pattern and is often composed of microcystic, tubular, and solid structures with abundant eosinophilic homogenous or bubbly secretions.

Colloid-like secretory material stains positively for periodic acid-Schiff with and without diastase as well as for Alcian Blue.

References

- Mammary Analogue Secretory Carcinoma of Salivary Glands With High-grade Transformation: Report of 3 Cases With the ETV6-NTRK3 Gene Fusion and Analysis of TP53, β-Catenin, EGFR, and CCND1 Genes. Skálová A, Vanecek T, Majewska H, Laco J, Grossmann P, Simpson RH, Hauer L, Andrle P, Hosticka L, Branžovský J, Michal M.
Am J Surg Pathol. 2014 Jan;38(1):23-33. doi:10.1097/PAS.0000000000000088 .PMID: #24145651#

- Mammary analogue secretory carcinoma of salivary glands is a lipid-rich tumour, and adipophilin can be valuable in its identification. Mariano FV, Dos Santos HT, Azañero WD, da Cunha IW, Coutinho-Camilo CM, de Almeida OP, Kowalski LP, Altemani A.
Histopathology. 2013 May 17. doi:10.1111/his.12192 . PMID: #23931576#