Ah Ram Chang

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Current evidence suggests that epigenetic changes play an important role in the evolution of human cancers. In this study, we evaluated whether hypermethylation of CpG islands at the gene promotor regions of several tumor-related genes is involved in the carcinogenesis of oligodendroglial tumors. We examined the methylation status of 11 genes in a series of(More)
3] EIA/TIA. Cellular system dual-mode mobile station { base station compatibility standard. 4] EIA/TIA. Mobile station-base station compatibility standard for dual-mode wideband spread spectrum cellular system. Eliminating the boundary eeect of a large-scale personal communication service network simulation. 15 6 Conclusions We described an architecture and(More)
OBJECT Ependymomas are rare glial neoplasms; little is known about the molecular pathogenesis of this tumor entity. In a previous study the authors found multiple genomic imbalances in ependymomas resected in 20 adults and eight children, including loss of chromosomes 1p, 6, 16, 17, 19q, 20q, and 22q, as well as gain of chromosomes 4q, 5q, 7q, 9q, and 12q(More)
Intrathyroidal lymphoepithelial cysts are rare, and only 15 such cases have been reported. Although sonography has been performed in some cases, the findings have not been discussed previously. Despite its rarity, the sonographic appearances of this lesion are similar to those of other commonly encountered congenital cystic lesions in the head and neck,(More)
PURPOSE The purpose of this study is to investigate the current status of stereotactic body radiotherapy (SBRT) in Korea. A nationwide survey was conducted by the Korean Stereotactic Radiosurgery Group of the Korean Society for Radiation Oncology (KROG 13-13). MATERIALS AND METHODS SBRT was defined as radiotherapy with delivery of a high dose of radiation(More)
The incidence of brain metastasis from hepatocellular carcinoma (HCC) is increasing because of the improved survival outcome of HCC patients, but the prognosis of these patients is extremely poor. HCC patients with brain metastasis were investigated to identify their prognostic factors for overall survival. Patients with brain metastasis from HCC who had(More)
BACKGROUND To investigate the effect of computed tomography (CT) contrast enhancement (CE) on the 3D dose distributions of non-coplanar small field beams in the CyberKnife (CK) treatment planning system (TPS) for the stereotactic ablative radiotherapy (SABR). METHODS Twenty-two pre-CE CT treatment plans were recruited to this retrospective plan study.(More)
OBJECTIVE To evaluate the safety and technical success rate of an ultrasound-guided fiducial marker implantation in preparation for CyberKnife radiation therapy. MATERIALS AND METHODS We retrospectively reviewed 270 percutaneous ultrasound-guided fiducial marker implantations in 77 patients, which were performed from June 2008 through March 2011. Of 270(More)
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses /by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Dear Editor: I read with great interest the article(More)
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