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Somatic PRKAR1A Gene Mutation in a Nonsyndromic Metastatic Large Cell Calcifying Sertoli Cell Tumor.
Journal of the Endocrine Society 2019 July 2
Large cell calcifying Sertoli cell tumors (LCCSCTs) are rare testicular tumors, representing <1% of all testicular neoplasms. Almost 40% of patients with LCCSCTs will present in the context of an inherited tumor predisposition condition, such as Carney complex (CNC) or Peutz-Jeghers syndrome. We report the case of a 42-year-old man who had presented with a right testicular mass, and was diagnosed with metastatic LCCSCT. The patient underwent radical orchiectomy, achieving initial remission of his disease. However, lymph node and hepatic metastases were identified. He received chemotherapy without response, and he died of complications of his disease 4 years after the initial diagnosis. Genetic analysis of the tumor and a lymph node metastasis identified a somatic frameshift mutation in the PRKAR1A gene (c.319delG, p.E107fs*22). The mutation was predicted to result in premature termination of the PRKAR1A protein and, thus, not be expressed at the protein level, consistent with other PRKAR1A nonsense mutations. The patient was extensively screened for signs of CNC, but he had no stigmata of the complex. To the best of our knowledge, the present report is the first of a somatic mutation in the PRKAR1A gene shown to be associated with a seemingly sporadic case of LCCSCT. Somatic PRKAR1A mutations are rare in sporadic tumors, and it is unknown whether this mutation was causative of LCCSCT in our patient who did not have CNC, or contributed to the malignancy of the tumor, which might have been caused by additional mutations.
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