A spindle cell neoplasm with MYH9::EGFR fusion and co-expression of S100 and CD34, further expanding the family of kinase fusion positive spindle cell neoplasms


doi: 10.1002/gcc.23134.


Online ahead of print.

Affiliations

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Elisabetta Caprini et al.


Genes Chromosomes Cancer.


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Abstract

Soft tissue neoplasms displaying CD34 and S100 positivity with immunohistochemistry are rare with a wide morphological range and frequent neurotrophic tyrosine receptor kinase (NTRK) alterations. Recent reports describe mutation of other kinases besides NTRK in these tumours. In the present paper we report a case of a young male suffering from a soft tissue neoplasm in the lumbar region. At microscopic examination, it was a CD34 and S100-positive soft tissue tumour showing a multilobulated growth pattern composed of cells with pale cytoplasm and abundant normal smooth muscle stroma. The genetic profile showed alterations affecting EGFR gene represented by a novel MYH9::EGFR fusion transcript and the p.K714N mutation.


Keywords:

CD34; EGFR; NTRK; S100; sarcoma.

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