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• W2170297974 abstract "The pathogenetic mechanisms underlying pituitary tumorigenesis are largely unknown. Previous reports have suggested that aggressive pituitary adenomas and/or carcinomas may be associated with genetic alterations that are distinct from those responsible for the more common and less aggressive pituitary adenomas. Here, we describe the clonal composition of a pituitary carcinoma, its recurrence and its metastasis. The samples studied were from a 48-year-old woman who presented with recurrent Cushing's syndrome. During the 8-year course of her disease, she had an ACTH-producing pituitary carcinoma requiring two transsphenoidal procedures and resection of a metastatic cervical lymph node. Her disease remained active despite surgical resection, external beam irradiation and medical treatment with ketoconazole. Ultimately, bilateral adrenalectomy was performed to control the hypercortisolism. Morphological and immunohistochemical studies revealed that the primary and recurrent pituitary tumours and the metastatic lesion were an endocrine tumour with ACTH and growth hormone immunoreactivity. Primary, recurrent and metastatic tumour DNAs were analysed for X-chromosome inactivation and loss of heterozygosity (LOH) at several microsatellite loci on chromosomes 9,10, 11, 13 and 22. All three lesions were monoclonal in composition as suggested by the pattern of X chromosome inactivation of the PGK-1 allele. Moreover, the primary, recurrent and metastatic lesions demonstrated LOH at the microsatellite allelic markers PYGM and D10S217. In contrast, however, the metastatic lesion showed a loss-to-retention pattern at two distinct loci (IFNA and D22S156) compared to the primary and recurrent pituitary tumours. These findings, while consistent with a clonal composition of the primary and metastatic pituitary lesions, show each clone to be distinct. This is the first description of a metastatic pituitary carcinoma with a distinct clonal composition from its primary source." @default.
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• W2170297974 date "2001-10-01" @default.
• W2170297974 modified "2023-10-02" @default.
• W2170297974 title "Distinct clonal composition of primary and metastatic adrencorticotrophic hormone‐producing pituitary carcinoma" @default.
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• W2170297974 doi "https://doi.org/10.1046/j.1365-2265.2001.01322.x" @default.
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