1.Mechanical properties and cytotoxicity of PLA/PCL films.
Heeseok JEONG ; Jeongwon RHO ; Ji Yeon SHIN ; Deuk Yong LEE ; Taeseon HWANG ; Kwang J KIM
Biomedical Engineering Letters 2018;8(3):267-272
Thermodynamically immiscible poly(lactic acid) (PLA) and poly(ε-caprolactone) (PCL) were blended and solution-cast by adding the 3% compatibilizer (tributyl citrate, TBC) of the PCL weight. In the PLA/PCL composition range of 99/1–95/5 wt%, mechanical properties of the PLA/PCL films with TBC were always superior to those of the films without TBC. The tensile strength of 42.9 ± 3.5 MPa and the elongation at break of 10.3 ± 2.7% were observed for the 93/7 PLA/PCL films without TBC, indicating that PCL addition is effective for strength and ductility. However, the tensile strength of 54.1 ± 3.4 MPa and the elongation at break of 8.8 ± 1.8% were found for the 95/5 PLA/PCL with TBC, indicating that the effect of co-addition of PCL and TBC on mechanical properties of the films is more pronounced. No cytotoxicity was observed for the PLA/PCL films regardless of TBC addition.
Cell Proliferation
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Citric Acid
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Tensile Strength
2.The Present and Future of Type 1 Diabetes Prevention:Teplizumab and Immunomodulators
Heeseok SOHN ; Sujong KIM ; Jeong-Hyun YOON
Korean Journal of Clinical Pharmacy 2024;34(4):210-221
Type 1 diabetes (T1D) is a chronic autoimmune disease characterized by the destruction of insulin-producing beta-cells in the pancreas.Genetic variations within the major histocompatibility complex (MHC) significantly influence the development of T1D, with diseaseprogression often indicated by the presence of autoantibodies. Until recently, insulin therapy was the sole treatment for T1D. However, in 2022, the Food and Drug Administration approved teplizumab, an anti-CD3 monoclonal antibody, as a novel immunomodulatory therapy to delay the onset of T1D. Various immunologic agents, including anti-CD antibodies and anti-cytokine autoantibodies, have been investigated across various stages of T1D in clinical trials. This article examines the current status of drug development for theprevention and treatment of T1D and summarizes key studies that aimed at delaying the onset of T1D using these agents. While effortsto halt or prevent the disease prior to clinical diagnosis have yielded limited success, post-diagnosis interventions have shown promising potential in slowing disease progression by preserving beta-cell function. Further investigation into long-term clinical outcomes related to the delay of T1D onset is necessary, and ongoing studies require extended follow-up to assess their full potential.
3.The Present and Future of Type 1 Diabetes Prevention:Teplizumab and Immunomodulators
Heeseok SOHN ; Sujong KIM ; Jeong-Hyun YOON
Korean Journal of Clinical Pharmacy 2024;34(4):210-221
Type 1 diabetes (T1D) is a chronic autoimmune disease characterized by the destruction of insulin-producing beta-cells in the pancreas.Genetic variations within the major histocompatibility complex (MHC) significantly influence the development of T1D, with diseaseprogression often indicated by the presence of autoantibodies. Until recently, insulin therapy was the sole treatment for T1D. However, in 2022, the Food and Drug Administration approved teplizumab, an anti-CD3 monoclonal antibody, as a novel immunomodulatory therapy to delay the onset of T1D. Various immunologic agents, including anti-CD antibodies and anti-cytokine autoantibodies, have been investigated across various stages of T1D in clinical trials. This article examines the current status of drug development for theprevention and treatment of T1D and summarizes key studies that aimed at delaying the onset of T1D using these agents. While effortsto halt or prevent the disease prior to clinical diagnosis have yielded limited success, post-diagnosis interventions have shown promising potential in slowing disease progression by preserving beta-cell function. Further investigation into long-term clinical outcomes related to the delay of T1D onset is necessary, and ongoing studies require extended follow-up to assess their full potential.
4.The Present and Future of Type 1 Diabetes Prevention:Teplizumab and Immunomodulators
Heeseok SOHN ; Sujong KIM ; Jeong-Hyun YOON
Korean Journal of Clinical Pharmacy 2024;34(4):210-221
Type 1 diabetes (T1D) is a chronic autoimmune disease characterized by the destruction of insulin-producing beta-cells in the pancreas.Genetic variations within the major histocompatibility complex (MHC) significantly influence the development of T1D, with diseaseprogression often indicated by the presence of autoantibodies. Until recently, insulin therapy was the sole treatment for T1D. However, in 2022, the Food and Drug Administration approved teplizumab, an anti-CD3 monoclonal antibody, as a novel immunomodulatory therapy to delay the onset of T1D. Various immunologic agents, including anti-CD antibodies and anti-cytokine autoantibodies, have been investigated across various stages of T1D in clinical trials. This article examines the current status of drug development for theprevention and treatment of T1D and summarizes key studies that aimed at delaying the onset of T1D using these agents. While effortsto halt or prevent the disease prior to clinical diagnosis have yielded limited success, post-diagnosis interventions have shown promising potential in slowing disease progression by preserving beta-cell function. Further investigation into long-term clinical outcomes related to the delay of T1D onset is necessary, and ongoing studies require extended follow-up to assess their full potential.
5.The Present and Future of Type 1 Diabetes Prevention:Teplizumab and Immunomodulators
Heeseok SOHN ; Sujong KIM ; Jeong-Hyun YOON
Korean Journal of Clinical Pharmacy 2024;34(4):210-221
Type 1 diabetes (T1D) is a chronic autoimmune disease characterized by the destruction of insulin-producing beta-cells in the pancreas.Genetic variations within the major histocompatibility complex (MHC) significantly influence the development of T1D, with diseaseprogression often indicated by the presence of autoantibodies. Until recently, insulin therapy was the sole treatment for T1D. However, in 2022, the Food and Drug Administration approved teplizumab, an anti-CD3 monoclonal antibody, as a novel immunomodulatory therapy to delay the onset of T1D. Various immunologic agents, including anti-CD antibodies and anti-cytokine autoantibodies, have been investigated across various stages of T1D in clinical trials. This article examines the current status of drug development for theprevention and treatment of T1D and summarizes key studies that aimed at delaying the onset of T1D using these agents. While effortsto halt or prevent the disease prior to clinical diagnosis have yielded limited success, post-diagnosis interventions have shown promising potential in slowing disease progression by preserving beta-cell function. Further investigation into long-term clinical outcomes related to the delay of T1D onset is necessary, and ongoing studies require extended follow-up to assess their full potential.
6.Phase II Study of Combination Chemotherapy with Etoposide and Ifosfamide in Patients with Heavily Pretreated Recurrent or Persistent Epithelial Ovarian Cancer.
Heeseok KANG ; Tae Joong KIM ; Chel Hun CHOI ; Jeong Won LEE ; Je Ho LEE ; Duk Soo BAE ; Byoung Gie KIM
Journal of Korean Medical Science 2009;24(5):945-950
The aim of this trial was to investigate the efficacy and toxicity of combination chemotherapy with etoposide and ifosfamide (ETI) in the management of heavily pretreated recurrent or persistent epithelial ovarian cancer (EOC). Patients with recurrent or persistent EOC who had measurable disease and at least two prior chemotherapy participating in this phase II trial were to receive etoposide at a dose of 100 mg/m2/day intravenously (IV) on days 1 to 3 in combination with ifosfamide 1 g/m2/day IV on days 1 to 5, every 21 days. Thirty-seven patients were treated; about 78% had previously received more than two separate regimens. The response rate (RR) was 18.9% and median duration of response was 7 months (range, 1-15). Treatment free interval prior to ETI (TFI) has significant correlation with RR rate (P=0.034). Patients (n=6) with TFI > or =6 months had 50% of RR, while patients (n=31) with TFI <6 months had 12.9%. Median survival was 9 months at a median follow-up of 9.2 months. Grade 3 or 4 toxicities included neutropenia in 20.1% of the 139 cycles of ETI, anemia in 7.2% and thrombocytopenia in 8.6%. The ETI produces relatively low toxicity and modest activity in heavily pretreated recurrent or persistent EOC. This is significant in patients with TFI > or =6 months.
Adult
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Aged
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Antineoplastic Combined Chemotherapy Protocols/*therapeutic use
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Etoposide/administration & dosage/*therapeutic use
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Female
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Humans
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Ifosfamide/administration & dosage/*therapeutic use
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Middle Aged
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Neoplasm Recurrence, Local/*drug therapy
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Ovarian Neoplasms/*drug therapy/mortality
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Survival Rate
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Treatment Outcome
7.MR Imaging in Endometrial Carcinoma as a Diagnostic Tool for the Prediction of Myometrial Invasion and Lymph Node Metastasis.
Ui Nam RYOO ; Chel Hun CHOI ; Ji Yeong YOON ; Soo Kyung NOH ; Heeseok KANG ; Woo Young KIM ; Boh Hyun KIM ; Tae Joong KIM ; Jeong Won LEE ; Je Ho LEE ; Byoung Gie KIM ; Duk Soo BAE
Cancer Research and Treatment 2007;39(4):165-170
PURPOSE: The purpose of this study was to evaluate the factors that are associated with the accuracy of magnetic resonance (MR) imaging for predicting myometrial invasion and lymph node metastasis in women with endometrial carcinoma. MATERIALS AND METHODS: We retrospectively reviewed the medical records and preoperative MR imaging reports of 128 women who had pathologically proven endometrial carcinoma. We compared the MR imaging and the histopathology findings. RESULTS: The sensitivity, specificity and accuracy for identifing any myometrial invasion (superficial or deep) were 0.81, 0.61 and 0.74, respectively; these values for deep myometrial invasion were 0.60, 0.94 and 0.86, respectively. The sensitivity, specificity and accuracy of MR imaging for detecting lymph node metastasis were 50.0%, 96.6% and 93.0%, respectively. The patients who were older, had more deliveries and a larger tumor size more frequently had incorrect prediction of deep myometrial invasion (p=0.034, p=0.044, p=0.061, respectively). A higher tumor grade, a histology other than the endometrioid type, myometrial invasion on MR findings and a larger tumor size were associated with a more frequent false-negative prediction of lymph node metastasis (p=0.018, p=0.017, p=0.002, p=0.047, respectively). A larger tumor size was also associated with more frequent false-positive results (p=0.009). CONCLUSIONS: There are several factors that make accurate assessment of myometrial invasion or lymph node metastasis difficult with using MRI; therefore, the patients with these factors should have their MR findings cautiously interpreted.
Endometrial Neoplasms*
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Female
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Humans
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Lymph Nodes*
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Magnetic Resonance Imaging*
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Medical Records
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Neoplasm Metastasis*
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Retrospective Studies
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Sensitivity and Specificity