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Radiation for persistent or recurrent epithelial ovarian cancer: a need for reassessment
Choi, Noorie,Chang, Ji Hyun,Kim, Suzy,Kim, Hak Jae The Korean Society for Radiation Oncology 2017 Radiation Oncology Journal Vol.35 No.2
Purpose: The role of radiotherapy (RT) was largely deserted after the introduction of platinum-based chemotherapy, but still survival rates are disappointingly low. This study focuses on assessing the clinical efficacy of RT in relation to chemotherapy resistance. Materials and Methods: From October 2002 to January 2015, 44 patients were diagnosed with epithelial ovarian cancer (EOC) and treated with palliative RT for persistent or recurrent EOC. All patients received initial treatment with optimal debulking surgery and adjuvant platinum-based chemotherapy. The biologically effective dose (BED) was calculated with ${\alpha}/{\beta}$ set at 10. Ninety-four sites were treated with RT with a median BED of 50.7 Gy (range 28.0 to 79.2 Gy). The primary end-point was the in-field local control (LC) interval, defined as the time interval from the date RT was completed to the date any progressive or newly recurring disease within the RT field was detected on radiographic imaging. Results: The median follow-up duration was 52.3 months (range 7.7 to 179.0 months). The 1-year and 2-year in-field LC rates were 66.0% and 55.0%, respectively. Comparisons of percent change of in-field tumor response showed similar distribution of responses among chemoresistant and chemosensitive tumors. On multivariate analysis of predictive factors for in-field LC analyzed by sites treated, $BED{\geq}50Gy$ (hazard ratio, 0.4; confidence interval, 0.2-0.9; p = 0.025) showed better outcomes. Conclusion: Regardless of resistance to platinum-based chemotherapy, RT can be a feasible treatment modality for patients with persistent of recurrent EOC. The specific role of RT using updated approaches needs to be reassessed.
( Noorie Choi ),( Chang Geol Lee ),( Yong Chan Ahn ),( Dongryul Oh ),( Sang Wook Lee ),( Hong Gyun Wu ),( Sung Ho Moon ),( Yeon Sil Kim ),( Young Taek Oh ),( O Kyu Noh ),( Jin Ho Kim ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: Outcomes of postoperative radiotherapy(PORT) for squamous cell carcinoma of the tonsil were analyzed focusing on management and control of the neck.Methods: Medical records of 380 pathologically-confirmed tonsil cancer patients, treated with surgery and PORT from February 1993 to January 2011 at 15 institutions, were reviewed. Neck metastasis was absent(pN0) in 53(13.9%) and present(pN+) in 327(86.1%), of which 279(85.3%), 2(0.6%), and 46(14.1%) were ipsilateral, contralateral, and bilateral, respectively. Results: Neck irradiation(NI) was done in 346(91.1%) patients, while data was unavailable in 34(8.9%). After a median follow-up of 53 months, neck recurrence occurred in 28(7.4%) patients. Among the 53 pN0 patients, NI was ipsilateral-only, bilateral, and unknown in 25(47.2%), 21(39.6%), and 7(13.2%). One patient suffered from contralateral neck failure after an ipsilateral-only NI. For the 279 ipsilateral pN+ patients, NI was ipsilateral-only, bilateral, and unknown in 67(24.0%), 193(69.2%), and 19(6.8%). Neck recurrence occurred in 18(6.5%): 11(3.9%), 6(2.2%) and 1(0.4%) failed in the ipsilateral-only, contralateral-only, and bilateral neck. The 2 contralateral pN+ patients received bilateral NI and remained free of regional recurrence. NI data was available for 38(82.6%) of the 46 bilateral pN+ patients and all received bilateral NI. Three(6.5%), 2(4.3%) and 2(4.3%) patients recurred in the ipsilateral, contralateral, and bilateral neck. Conclusions: Because contralateral neck failure is rare in pN0 patients, elective NI may safely be confi ned to the ipsilateral neck-only. For pN+ patients, however, the risk of contralateral neck failure highly varies (3 to 10%). Thus clinicopathologic factors should be considered to justify the omission of contralateral NI for such heterogenous groups.
Radiation for persistent or recurrent epithelial ovarian cancer: a need for reassessment
Noorie Choi,Ji Hyun Chang,Suzy Kim,Hak Jae Kim 대한방사선종양학회 2017 Radiation Oncology Journal Vol.35 No.2
Purpose: The role of radiotherapy (RT) was largely deserted after the introduction of platinum-based chemotherapy, but still survival rates are disappointingly low. This study focuses on assessing the clinical efficacy of RT in relation to chemotherapy resistance. Materials and Methods: From October 2002 to January 2015, 44 patients were diagnosed with epithelial ovarian cancer (EOC) and treated with palliative RT for persistent or recurrent EOC. All patients received initial treatment with optimal debulking surgery and adjuvant platinum-based chemotherapy. The biologically effective dose (BED) was calculated with α/β set at 10. Ninety-four sites were treated with RT with a median BED of 50.7 Gy (range 28.0 to 79.2 Gy). The primary end-point was the in-field local control (LC) interval, defined as the time interval from the date RT was completed to the date any progressive or newly recurring disease within the RT field was detected on radiographic imaging. Results: The median follow-up duration was 52.3 months (range 7.7 to 179.0 months). The 1-year and 2-year in-field LC rates were 66.0% and 55.0%, respectively. Comparisons of percent change of in-field tumor response showed similar distribution of responses among chemoresistant and chemosensitive tumors. On multivariate analysis of predictive factors for in-field LC analyzed by sites treated, BED ≥ 50 Gy (hazard ratio, 0.4; confidence interval, 0.2–0.9; p = 0.025) showed better outcomes. Conclusion: Regardless of resistance to platinum-based chemotherapy, RT can be a feasible treatment modality for patients with persistent of recurrent EOC. The specific role of RT using updated approaches needs to be reassessed.
최누리(Noori Choi),변형배(Hyung Bai Byun),김동석(Dong Seok Kim),이병채(Byung Chai Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In many mechanical structures, the number of spot welds is closely related to overall cost and time of production of assemblies. In this study, we optimized the location and the number of spot welds in the lower control arm of the vehicle, as far as the structure retained the maximizing the fatigue resistance and durability. To ensure the requirements, we proposed design of experiment optimization method for the durability of LCA. During this optimization process, the design guideline for the optimal spot welding number and location was drawn as the minimum life expectation influence.
CAE 해석에 기반 한 DOE 를 이용한 자동차 부품의 점 용접점 개수 최적화
최누리(Noori Choi),박정민(Jung-min Park),이병채(Byung-chai Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A vehicle body usuallu has more than 4,000 spot weld point and reducing the number of those points greatly reduces production cost of a vehicle. We choose spot weld points that can be removed without decreasing of frequency of a component of vehicle body using DOE (design of experiment). Initial candidate points were chosen by sensitivity analysis and 2-level DOE with respect to frequency analysis was used to determine points that would be removed. We applied proposed methodology to the LCA (lower control arm) of a vehicle.
The Nexus between International Trade, FDI and Income Inequality
Meiling Wang,Noori Park,Chang Hwan Choi 한국무역학회 2020 Journal of Korea trade Vol.24 No.4
Purpose - This paper investigated the effect of international trade affects income inequality. It also compares the different effects between developing and developed countries over the period from 2005 to 2014 for 58 countries. Design/methodology - The econometric estimation was used to identify the relationship between export, import, FDI, GDP, unemployment and income inequality. In this empirical analysis, we utilized a Vector Error Correction (VEC) model using panel data. Findings - The findings show that there is a close correlated between trade and income inequality. The higher export ratio of GDP tends to have a 1.79 times more income inequality in developing countries than in developed countries. The higher import ratio of GDP tends to have a 2.44 times higher income inequality in developing countries than in developed countries. Further, Increasing FDI tend to have an approximately 1.43 times higher income inequality in developing countries than in developed countries. Korea is in the middle of developed and developing countries’ result. Originality/value - To correct the global income inequality regarding trade, developed countries’ proactive trade policies, such as granting preferential tariff benefits to developing countries, are likely to be needed and Income Safety Net in international trade must be taken into account.