Ovarian metastasis from uveal melanoma with MLH1/PMS2 protein loss in a patient with germline MLH1 mutated Lynch syndrome: consequence or ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2017-03

AUTHORS

João Lobo, Carla Pinto, Micaela Freitas, Manuela Pinheiro, Rámon Vizcaino, Esther Oliva, Manuel R. Teixeira, Carmen Jerónimo, Carla Bartosch

ABSTRACT

Currently, uveal melanoma is not considered within the Lynch syndrome tumor spectrum. However, there are studies suggesting a contribution of microsatellite instability in sporadic uveal melanoma tumorigenesis. We report a 45-year-old woman who was referred for genetic counseling due to a family history of Lynch syndrome caused by a MLH1 mutation. She originally underwent enucleation of the right eye secondary to a uveal spindle cell melanoma diagnosed at age 25. The tumor recurred 22 years later presenting as an ovarian metastasis and concurrently a microscopic endometrial endometrioid carcinoma, grade 1/3 was diagnosed. Subsequent studies highlighted that the uveal melanoma showed high microsatellite instability and loss of MLH1 and PMS2 protein expression, with no MLH1 promoter methylation or BRAF mutation. Additionally, a GNAQ mutation was found. We conclude that our patient's uveal melanoma is most likely related to MLH1 germline mutation and thus Lynch syndrome related. To the best of our knowledge, this is the first report of uveal melanoma showing MLH1/PMS2 protein loss in the context of Lynch syndrome. More... »

PAGES

347-352

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00428-016-2052-4

DOI

http://dx.doi.org/10.1007/s00428-016-2052-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1021361213

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/27915441


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38 schema:description Currently, uveal melanoma is not considered within the Lynch syndrome tumor spectrum. However, there are studies suggesting a contribution of microsatellite instability in sporadic uveal melanoma tumorigenesis. We report a 45-year-old woman who was referred for genetic counseling due to a family history of Lynch syndrome caused by a MLH1 mutation. She originally underwent enucleation of the right eye secondary to a uveal spindle cell melanoma diagnosed at age 25. The tumor recurred 22 years later presenting as an ovarian metastasis and concurrently a microscopic endometrial endometrioid carcinoma, grade 1/3 was diagnosed. Subsequent studies highlighted that the uveal melanoma showed high microsatellite instability and loss of MLH1 and PMS2 protein expression, with no MLH1 promoter methylation or BRAF mutation. Additionally, a GNAQ mutation was found. We conclude that our patient's uveal melanoma is most likely related to MLH1 germline mutation and thus Lynch syndrome related. To the best of our knowledge, this is the first report of uveal melanoma showing MLH1/PMS2 protein loss in the context of Lynch syndrome.
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