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Articles by J. H. Lee
Total Records ( 2 ) for J. H. Lee
  D.Y Yoon , S.K Chang , C.S Choi , W. K Kim and J. H. Lee

BACKGROUND AND PURPOSE: The aim of our study was to assess the accuracy of multidetector row CT angiography (MDCTA) in the detection of the underlying vascular abnormalities causing spontaneous lobar intracerebral hemorrhage (ICH) compared with conventional digital subtraction angiography (DSA).

MATERIALS AND METHODS: Seventy-eight patients who underwent MDCTA with use of a 16-detector row scanner and DSA were prospectively included in this study. Each study was assessed by 2 independent blinded neuroradiologists; decisions were made in consensus. Findings on CT angiograms, including the original axial data, multiplanar reformations, and volume-rendered images with and without automated bone segmentation, were used to identify the underlying causes of ICH.

RESULTS: Twenty-two of the 78 patients (28.2%) exhibited angiographic abnormalities, including aneurysms of the proximal arteries (n = 9), arteriovenous malformations (n = 7), Moyamoya disease (n = 4), and aneurysms of the distal arteries (n = 2). MDCTA detected the underlying vascular abnormalities in 21 patients except 1 case of small arteriovenous malformation. Overall sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of MDCTA for detection of underlying vascular abnormalities were 95.5%, 100%, 100%, 98.2%, and 98.7%, respectively.

CONCLUSIONS: MDCTA is a highly accurate imaging technique in the diagnosis of underlying vascular abnormalities in patients with spontaneous lobar ICH.

  W. C Spanos , P Nowicki , D. W Lee , A Hoover , B Hostager , A Gupta , M. E Anderson and J. H. Lee

Background  Human papillomavirus (HPV) is the most identifiable cause of head and neck squamous cell cancer (HNSCC). Compared with HPV-negative HNSCC, HPV-positive HNSCC presents at an advanced stage but with significantly better survival. We created a syngeneic mouse model of HPV-positive and HPV-negative HNSCC by transforming mouse primary tonsil epithelial cells with either HPV oncogenes or a nonantigenic RNA interference strategy that affects similar oncogenic pathways.

Objectives  To examine the effect of radiation therapy on HPV-positive and HPV-negative tumors in immune-competent and immune-incompetent mice and to examine responses in human cancer cell lines.

Design  Prospective in vivo murine model.

Main Outcome Measures  Survival and tumor growth.

Results  For human and murine transformed cell lines, HPV-positive cells were more resistant to radiation and cisplatin therapy compared with HPV-negative cells. In vivo, HPV-positive tumors were more sensitive to radiation, with complete clearance at 20 Gy, compared with their HPV-negative counterparts, which showed persistent growth. Cisplatin in vivo cleared HPV-positive tumors but not HPV-negative tumors. However, neither radiation or cisplatin therapy cured immune-incompetent mice. Adoptive transfer of wild-type immune cells into immune-incompetent mice restored HPV-positive tumor clearance with cisplatin therapy.

Conclusions  The HPV-positive tumors are not more curable based on increased epithelial sensitivity to cisplatin or radiation therapy. Instead, radiation and cisplatin induce an immune response to this antigenic cancer. The implications of these results may lead to novel therapies that enhance tumor eradication for HPV-positive cancers.

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