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Seok Jun Hong  (Hong SJ) 8 Articles
A Comparison Technetium-99m and Iodine-123 Scan in Thyroid Hot Nodules.
Eun Sook Kim, Seok Jun Hong, Young Ki Song, Jin Sook Ryu, Dae Hyuk Moon, Ki Soo Kim
J Korean Endocr Soc. 1999;14(2):339-345.   Published online January 1, 2001
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BACKGROUND
Pertechnetate ( Tc) has been widely employed for thyroid imaging. While pertechnetate and radioiodide have usually similar results in identifying thyroid nodules, occasionally differences have been noted. We intended to observe that the thyroid nodules which appeared to be hot on pertechnetate and to compare them with the images by radioiodide. METHODS: 'I scan was performed to thirty-eight cases (mean age: 48.9 +/- 13.2) presenting as hot nodule on Tc scan. Thyroid function test and pathologic diagnosis were obtained in all patients. RESULTS: Of the 38 patients, 24 had euthyroidism, 13 had hyperthyroidism, and 1 had hypothyroidism. Thirty patients had adenomatous goiter, 4 papillary carcinoma, 3 Hashimotos thyroiditis, and 1 had HQrthle cell tumor. 28 of 38 patients showed similar images, but the remaining 10 patients(26.3%) revealed discordant images on Tc and 131I scan. Among the concordant cases, 23 had adenomatous goiter, 3 had papillary carcinoma, and 2 had Hashimotos thyroiditis. Among the discordant cases, 7 had adenomatous goiter, 1 had papillary carcinoma, 1 had Hashimotos thyroiditis, and 1 had HQrthle cell tumor. The incidence of malignancy was 10.7% of concordant cases, and 20% of discordant cases and was revealed statistically insignificant (p>0.05). CONCLUSION: We observed higher incidence of malignancy in patients presenting hot nodules on 99mTc scan than ever reported. Fine needle aspiration should be performed to all patients with hot nodules and the 'I scan would not be recommended for further diagnostic study.
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Effect of Radioactive Iodine Therapy in Patients with Scan-Negative, Thyroglobulin-Positive Thyroid Cancer.
Eun Sook Kim, Seok Jun Hong, Jin Yub Kim, Young Ki Song, Jin Sook Ryu, Dae Hyuk Moon, Ki Soo Kim, Sang Wook Kim
J Korean Endocr Soc. 1999;14(2):330-338.   Published online January 1, 2001
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BACKGROUND
After total thyroidectomy the presence of detectable serum thyroglobulin(Tg) concentration is an index of residual or metastatic thyroid tissue and is usually well correlated with positive I whole body scan. However, it is not rare to find a patient with detectable serum Tg levels but without any uptake on I whole-body scan. At present it is not certain how to manage such patients. We performed whole body scan after administration of therapeutic dose of 131I to evaluate the usefulness of radioactive iodine therapy in the above setting. METHODS: Fifteen patients (4 males and 11 females, ranging in age from 17 to 74 years) were studied. They had been previously treated with total thyroidectomy for papillary thyroid cancer followed by therapy with 131I for ablation of their thyroid residue. Tg levels were determined by immunoradiometric assay method. 131I (100-200 mCi) therapy was administered and whole body scan was performed. 99mTc MIBI scans were taken in 9 patients. Follow up data of Tg were available in 12 patients at time interval of 6 12 months from the first study and treatment. RESULTS: Tg(on) levels of these patients were in a range of 2.2210 ng/mL (mean 36.1 +/- 59.1 ng/mL) and Tg(off) levels were 17.3 1,592 ng/mL (mean 197.3 +/- 400.3 ng/mL). After radioiodide therapy, Tg(on) levels were in 1.48.5 ng/mL (mean 11.0 +/- 13.5 ng/mL), Tg (off) were 11.9 478.0 ng/mL (mean 159.3 +/- 159.8 ng/mL). The Tg (on) levels were decreased significantly after RAI therapy, but Tg (off) levels had no significant difference, In 8 of the 15 patients (53.3%), posttreatment whole body scan showed definite positive uptakes which were not evident in pretreatment diagnostic scan. There were local recurrence in 3 cases, regional lymph node metastasis in 4 cases, and lung in I case. Diffuse hepatic uptake was definitely seen in 7 cases. The MIBI scan showed abnorml uptakes in 4 of 9 cases. CONCLUSION: The therapeutic usefulness of 100 to 200 mCi of 131I treatment in patients with 131I scan-negative and Tg-positive was unclear. And the MIBI scan was only partially effective. Further studies with other diagnostic and therapeutic approachs are required to evaluate the exact lesions and to improve prognosis.
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Allelotyping and Comparative Genomin Hybridization Studies in Papillary Thyroid Carcinomas and Follicular Adenomas.
Il Min Ahn, Eun Sook Kim, Hyun Soo Park, Ki Young Park, Seok Jun Hong, Kyung Yub Gong, Jin Yub Kim, Sung Bae Kim, Sang Hee Kim, Sung Jin Lee, Jung Hee Han, Kwan Ja Jee
J Korean Endocr Soc. 1999;14(2):314-322.   Published online January 1, 2001
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BACKGROUND
In our previous study, the prevalence of the known causes of thyroid tumorigenesis was relatively rare in Korean population, suggesting genetic and environmental differences exist. Screening of genetic alteration in papillary thyroid carcinoma(PTC) and follicular adenoma(FA) in whole genomic scale was needed prior to search on individual genes of possible causes. METHODS: Ten cases of PTC without ret/PTC-I, -2, -3 rearrangement and 5 cases of follicular adenoma were included in the study of microsatellite marker allelotyping. Sixty two microsatellite markers available, were chosen to cover the known sites of loss of heterozygosity(LOH) involved in thyroid tumors, tumor suppressor genes and terminal portion of each chromosomes. PCR was performed on tumor DNA and leukocytes DNA from each patient with MDE gel electrophoresis to detect LOH. Same specitnens as above, 3 case of normal thyroid tissues and NPA, ARO cell lines were included in the study of comparative genomic hybridization(CGH). Tumor and control DNAs were hybridized to metaphase chromosome with differential stainings with fluorescein and rhoda-mine-dUTP. Obtained results were analyzed by multicolor fluorescence computer assisted image analyzer. RESULTS: In allelotyping, LOH were detected in 5 cases of PTC, 2 cases on D10S1435, 1 case each on D2S1780, DSS1099, D11S1986, D16S539, 1 case of PTC revealed LOH on DSS1099, D11S1986. In FA, LOH were detected in 3 cases on D1S534, D1S226, Dl 1S907, D22S683, DXS9807. In CGH, Xp addition was noticed in 1 case of PTC, 12q and 10p addition was noticed in 1 case each, 16q deletion and 17q addition in 1 case of FA. CONCLUSION: No hot spot of LOH was noticed in microsatellite marker allelotyping, neither of common chromosomal change in CGH study suggesting unbalanced translocation or gene amplification more than 5-10 Mb may be involved in the genetic alteration of PTC and FA.
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A Case of Multiple Endocrine Neoplasia Type I Presented with Secondary Amenorrhea and Osteoporosis.
Sang Bum Hong, Seok Jun Hong, Young Ki Song, Ki Soo Kim, Sang Wook Kim, Ki Ub Lee, Min Kyu Kim, Seung Mo Hong, Duck Jong Han
J Korean Endocr Soc. 1998;13(4):684-689.   Published online January 1, 2001
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MEN type 1 is characterized primarily by the presence of functioning and nonfunctioning tumors or hyperplasia of the pituitary gland, parathyroid glands, and pancreatic islet cells. Pancreatic islet tumors in MEN type 1 produce different kinds of hormone which were pancreatic polypeptide, gastrin, glucagon, insulin and so on. To date, ten cases had been reported in Korea. We report another case with MEN type 1 having prolatin-secreating pituitary adenoma, parathyroid hyperplasia and insulinoma. A 36-year-old woman was admitted because of long-standing amenorrhea and recently diagnosed osteoporosis. Otherwise, she had been in good health except experiencing one episode of loss of consciousness after skipped meal. The blood chemistries were normal except hypercalcemia and hypophosphatemia. Hormonal studies revealed elevated levels of intact PTH and prolactin and decreased value of estradiol with low LH and FSH. The neck CT revealed 1 cm-sized nodule at posterior portion of right thyroid gland and 99mTc-sestamibi sintigraphy showed a increased uptake in left lower and right lower parathyroid glands. The sella MRI showed 0.7 cm-sized enhanced lesion in the left pituitary gland. The ratio of immunoreactive insulin to glucose was elevated and 3-4 pancreatic masses of variable size were identified by endoscopic ultrasonography and angiography. Subtotal parathyroidectomy and pyrolus-preserving pancreaticoduodenectomy with spleen-preserving distal pancreatectomy was done. Postoperative she had been doing well with normocalcemia and normoglycemia. Transsphenoidal adenonectomy was done 5 months later. Histologic examination of removed tissues revealed a single insulinoma, prathyroid hyperplasia and prolactin-secreating pituitary adenoma.
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Concurrent Medullay and Papillary Carcinoma of the Thyroid.
Seok Jun Hong, Kyung Yub Gong, Young Ki Song, Jin Sook Ryu, Ki Soo Kim, Jung Hee Lee
J Korean Endocr Soc. 1998;13(4):634-639.   Published online January 1, 2001
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The origins of medullary carcinoma and papillary carcinoma of thyroid are embryologically different. We report a case of simultaneous occurrence of medullary carcinoma and papillary carcinoma of the thyroid in the same thyroid gland. In this case, the occurrence of the two tumors may be a coincidence, does not have embryological or genetical significance.
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The Expression of the Bcl-2 Family Proteins in Thyroid Neoplasms.
Il Min Ahn, Eun Sook Kim, Seok Jun Hong, Kyung Yub Gong, Tae Jin Lee, Jin Yub Kim, Sung Bae Kim, Sang Hee Kim
J Korean Endocr Soc. 1998;13(3):359-365.   Published online January 1, 2001
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BACKGROUND
Proteins of the Bcl-2 family are intracellular membrane-associated proteins that regulate programmed cell death either positively or negatively by as yet unknown mechanism. Bcl-2 family proteins have an antiapoptotic function, such as the Bcl-2, the long form of Bcl-x and Mcl-l, or a proapoptotic function, like the short form of Bcl-x and Bax. To investigate the potential role of Bcl-2 family proteins in thyroid tumorigenesis, the authors examined the pattern of expression of the Bel-2 family proteins in various thyroid neoplasms. METHODS: Bcl-2 family proteins, including Bcl-2, Bcl-x, Mcl-1 and Bax proteins were immunohistochemically stained in 57 cases of various thyroid neoplasms using formalin-fixed and paraffin embedded tissues; 18 cases of papillary carcinoma, 6 cases of medullary carcinoma, 4 cases of anaplastic carcinoma, 10 cases of follicular adenoma, 9 cases of adenomatous goiter, and 10 autopsy cases of fetal thyroid galnd. The intensity and frequency of the immunostaining were evaluated with the program of Image-Pro Plus Version 3.0 for image analysis. RESULT: Consistent expression of Bcl-2, Mcl-1, and Bax proteins were present in the surrounding normal thyroid tissue, however the expression of Bcl-x protein was not observed. Compare to the expression patterns of adenomatous goiter, and fetal and surrounding normal thyroid tissues, papillary and anaplastic carcinomas showed the decreased Bcl-2 and increased Bcl-x protein expressions(p (0.05). Medullary carcinoma revealed the increased Bcl-x protein expression only(p 0.05). CONCLUSION: These data suggest that combined patterns of decreased Bcl-2 and increased Bcl-x protein expressions may eontribute to the carcinogenesis of thyroid cancers originated from thyroid follicular cells, and an increased expression of Bcl-x protein may be related to the pathogenesis of medullary carcinoma from parafollicular C cells.
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Prevalence of Gsa, ras, p53 Mutations and ret/PTC Rearrangement in Differentiated Thyroid Tumors of Korean Population.
Il Min Ahn, Young Il Kim, Hyun Soo Park, Ki Young Park, Seok Jun Hong, Eun Joo Lee, Kyung Yub Gong
J Korean Endocr Soc. 1998;13(2):189-197.   Published online January 1, 2001
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BACKGROUND
In thyroid tumor, ras, Gsa, p53 mutation and ret/FfC rearrangement have been reported with variable prevalences in different geographic regions. We studied the prevalences of these mutations and reammgement in thyroid tumors of Korean population. METHODS: Eleven cases of adenamatous goiter, 8 cases of follicular adenoma, 5 cases of foliicular carcinoma, 37 cases of papillary carcinoma were included in this study. To find mutations and rearrangement, RT-PCR, SSCP, and/or direct sequencing, after subcloning if necessary, were used. RESULTS: We could not find any rearrangment for ret/PTC-l, -2, -3 and mutations of Gsa. For ras oncogene, K and H-ras mutations were not found, but N-ras mutations, point mutation of CAA to CGA in codon 61, were detected in 1 follicular adenoma(12.5%, 1/8) and 1 follicular carcinoma(33%, 1/3). And p53 mutations were detected only in 1 case of papillary carcinoma (3%, 1/31: exon 8, codon 266 GGA-GAA). CONCLUSION: ret/PTC rearrangement, Gsa, ras and p53 mutations are relatively rare in differentiated thyroid neoplasms of Korean population, which may reflect the genetic and environmental differences from those countries with high prevalence.
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Expression of Human Sodium Iodide Symporter mRNA in Papillary Thyroid Carcinoma.
Hong Kyu Kim, Il Min Ahn, Young Il Kim, Eun Sook Kim, Hyun Soo Park, Ki Young Park, Seok Jun Hong
J Korean Endocr Soc. 1998;13(2):181-188.   Published online January 1, 2001
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AbstractAbstract PDF
BACKGROUND
The sodium iodide symporter(NIS) is a plasma membrane protein which is respoasibIe for iodide transport into thyroid cell. The cDNA sequence of NIS has recently been cloned from rat and human. Intrinsic ability and its differences in iodide accumulation have been exploited as a useful tool for diagnosis and therapy of thyroid diseases. It is also known that some differentiated thyroid cancers do not take up radioactive iodine at therapeutic dose. METHODS: To understand the expression and regulation of NIS in thyroid tumars, we measured the expressons of human NIS(hNIS), TSH-receptor(R), and thyroglohulin(Tg) mRNAs from papillary thyroid carcinoma(PTC) tissues by reverse transcriptase-polymerase chain reaction (RT-PCR) and RNase protection assay(RPA). RESULT: By RT-PCR analysis, 87% of PTC expressed hNIS mRNA, but the degree of expression were variable. Interestingly, 32% of PTC showed significant level of hNIS expression even though pre-operative technetium thyroid scan of all thyroid tumors were cold but the level was lower than normal control tissues. All of PTC showed the expressions of Tg and TSH-R mRNAs and there was a correlation between hNIS mRNA and TSH-R mRNA(Rsq 0.35, p=0.01). By RPA, the expression of hNIS and TSH-R in normal control tissue were detected with 20microgram and 40microgram of total RNA respectively, but the higher concentrations(> or =60microgram for hNIS and > or =40microgram for TSH-R) were required to detect in PTC, showing that tbe expression of hNIS in FTC was lower than TSH-R expression. CONCLUSION: PTC tends to lose hNIS mRNA expression earlier than TSH-R mRNA and the measurement of hNIS mRNA in PTC may be useful as an indicator of the therapeutic response to radioactive iodine.
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Endocrinol Metab : Endocrinology and Metabolism