A rare case of choroid plexus carcinoma that led to the diagnosis of Lynch syndrome (hereditary nonpolyposis colorectal cancer).

A rare case of choroid plexus carcinoma that led to the diagnosis of Lynch syndrome (hereditary nonpolyposis colorectal cancer).

Clin Neurol Neurosurg. 2017 Apr 19;158:46-48

Authors: Zhu VW, Hinduja S, Knezevich SR, Silveira WR, DeLozier CD

Abstract
Lynch syndrome (hereditary nonpolyposis colorectal cancer) is an autosomal dominant disorder characterized by a significant risk of colorectal and endometrial cancers. A variety of other epithelial cancers may be associated with this syndrome. Brian tumors are infrequent, but have been reported in series. Here, we report a case of a 34-year-old Caucasian woman with WHO grade III choroid plexus carcinoma (CPC). Comprehensive genomic profiling of the patient's resected brain tumor revealed mutations in six genes: PTEN, VHL, MSH6, NOTCH1, RB1, and TP53. Family history is significant for endometrial cancer in her mother and sister as well as colon cancer in her maternal grandfather suggestive of Lynch syndrome. Site-specific mutational analysis showed the MSH6 mutation (p.R482*) in peripheral lymphocytes. Subsequently we performed immunohistochemical staining of the tumor tissue which demonstrated widespread loss of MSH6 with intact MSH2, MLH1, and PMS2. The diagnosis of Lynch syndrome due to a mutation in MSH6 was therefore established. Our patient elected to have adjuvant radiation to the surgical bed only followed by prophylactic total abdominal hysterectomy and bilateral salpingo-oophorectomy and is doing very well. To our knowledge, this is the first case report of CPC in an adult patient with a germline MSH6 mutation. We believe our data have provided molecular evidence to suggest that CPC could potentially be part of the Lynch syndrome spectrum.

PMID: 28460341 [PubMed - as supplied by publisher]

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