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Background and Objectives:Hereditary medullary thyroid carcinoma is presented as a part of MEN2A (65- 75% ) or MEN2B, but can also be inherited alone, which is called familial medullary thyroid carcinoma. The author sought to detect point mutations of the RET proto-oncogene using the molecular genetic method on the family line of the familial medulary thyroid carcinoma, which is identified by the family history of an index patient, and to investigate the presence of point mutation cariers among the Subjects and Method:DNA was extracted from the peripheral blod leukocyte of 5 patients who were asumed to have sporadic medulary thyroid carcinoma and 1 patient who was an index of a family line asumed to contain hereditary medullary thyroid carcinoma according to the family history. The PCR amplification of exons, 10, 11, 13, 14, 15, 16 was then caried out, and we investigated point mutations of the RET proto-oncogene using a DNA sequence analyzer. After family. Results:We identified point mutation of TGC (Cys)→CGC (Arg) at codon 618 of the RET proto-oncogene exon 10, using the automatic DNA sequence analyzing method on the index patient and detected the same point mutation with 4 of the 9 family members. Among them, the index patient and her mother who had biochemical and clinical symptoms underwent a total thyroidectomy and neck disection and are now being folowed up;operations are scheduled for two other members later on. Conclusion:test and that more complete aproach through early diagnosis would be posible by carrying out the screning test for point mutation in patients with the hereditary medulary thyroid carcinoma .

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