Choi, Jung Suk;Lee, Jiyun;Moon, Young Kyu;Moon, Seok Whan;Park, Jae Kil;Moon, Mi Hyoung
Journal of Chest Surgery
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v.53
no.3
/
pp.104-113
/
2020
Background: Accurate intraoperative assessment of mediastinal lymph nodes is a critical aspect of lung cancer surgery. The efficacy and potential for upstaging implicit in these dissections must therefore be revisited in the current era of uniportal video-assisted thoracoscopic surgery (VATS). Methods: A retrospective study was conducted in which 544 patients with stage I (T1abc-T2a, N0, M0) primary lung cancer were analyzed. To assess risk factors for nodal upstaging and to limit any imbalance imposed by surgical choices, we constructed an inverse probability of treatment-weighted (IPTW) logistic regression model (in addition to non-weighted logistic models). We also evaluated risk factors for early locoregional recurrence using IPTW logistic regression analysis. Results: In the comparison of uniportal and multiportal VATS, the resected lymph node count (14.03±8.02 vs. 14.41±7.41, respectively; p=0.48) and rate of nodal upstaging (6.5% vs. 8.7%, respectively; p=0.51) appeared similar. Predictors of nodal upstaging included tumor size (odds ratio [OR], 1.74; 95% confidence interval [CI], 1.12-2.70), carcinoembryonic antigen level (OR, 1.11; 95% CI, 1.04-1.18), and histologically confirmed pleural invasion (OR, 3.97; 95% CI, 1.89-8.34). The risk factors for locoregional recurrence within 1 year were found to be number of resected N2 nodes, age, and nodal upstaging. Conclusion: Uniportal and multiportal VATS appear similar with regard to accuracy and thoroughness, showing no significant difference in the extent of nodal dissection.
Air reduction is a safe, effective, and fast initial treatment for pediatric intussusception. There is low dose radiation exposure. Factors affecting outcomes of air reduction were analyzed by reviewing the clinical features and results of treatment. A total of 399 out of 485 patients with pediatric intussusceptions were treated at the Seoul National University Children's Hospital from 1996 to 2009. All of the patients received air reduction as the first line of treatment. Clinical features such as gender, age, seasonal variation, symptoms, signs, types, pathologic leading point, and treatment results including success rate, complication, recurrence, NPO time, and duration of hospitalization were reviewed. The Pearson chi-square, student T-, and logistic regression tests were used for statistical analysis. P-value less than 0.05 was considered to be statistically significant. The prevalent clinical features were: male (65.4 %), under one-year of age (40.3 %), ileocolic type (71.9 %), abdominal pain (85.4 %), and accompanying mesentery lymph node enlargement (2.2 %). The overall success rate for air reduction was 78.4 % (313 of 399 patients), and the perforation rate during reduction was 1.5 %. There were 23 recurrent cases over 21.6 months. All were successfully treated with re-do air reduction. Reduction failures had longer overall NPO times (27.067hrs vs. 43.0588hrs; p=0.000) and hospitalization durations (1.738d vs. 6.975d; p=0.000) compared to the successful cases. The factors affecting success rates were fever (p=0.002), abdominal distension (p=0.000), lethargy (p=0.000) and symptom duration (p=0.000) on univariate analysis. Failure rates were higher in patients with symptom durations greater than 24 hours (p=0.023), and lethargy (p=0.003) on multivariate analysis. Air reduction showed high success rates and excellent treatment outcomes as the initial treatment for pediatric intussusception in this study. Symptom duration and lethargy were significantly associated with reduced success rates.
Over the past decade, the improvement of communications technologies and the rapid spread of www (World Wide Web) have brought on the exponential growth of users using Internet and real time multimedia multicast services like video conferencing, tele-immersive virtual reality, and Internet games. The dense-wavelength division multiplexing (DWDM) networks have been widely accepted as a promising approach to meet the ever-increasing bandwidth demands of Internet users, especially in next generation Internet backbone networks for nation-wide or global coverage. A major challenge in the next generation Internet backbone networks based on DWDM technologies is the resolution of the multicasting RWA (Routing and Wavelength Assignment) problem; given a set of wavelengths in the DWDM network, we set up light-paths by routing and assigning a wavelength for each connection so that the multicast connections are set-upped as many as possible. Finding such optimal multicast connections has been proven to be Non-deterministic Polynomial-time-complete. In this paper, we suggest a new heuristic multicast routing and wavelength assignment method for multicast sessions called DVS-PMIPMR (Differentiated Virtual Source-based Priority Minimum Interference Path Multicast Routing algorithm). We measured the performance of the proposed algorithm in terms of number of wavelength and wavelength channel. The simulation results demonstrate that DVS-PMIPMR algorithm is superior to previous multicast routing algorithms.
Kim, Taeg-Hyun;Song, Kyo-Young;Kim, Seung-Nam;Park, Cho-Hyun
Journal of Gastric Cancer
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v.6
no.2
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pp.97-102
/
2006
Purpose: The prognosis for patients with a Borrmann type IV gastric cancer is extremely poor despite an aggressive surgical approach. We evaluated the clinicopathological features for Borrmann type IV cancers to find treatment strategy. Materials and Methods: The 1098 patients with advanced gastric cancer who underwent surgical resection between 1990 and 2001 were analyzed. These patients were divided into two groups: 81 patients with a Borrmann type IV carcinoma, and 1017 patients with all other types of gastric carcinomas. Results: Patients with a Borrmann type IV carcinoma were younger than those with other types, and female was prevalent (p=0.000). Of the patients with a Borrmann type IV gastric carcinoma, 68 patients (84%) were classified as stage III or IV at the initial diagnosis. The histologic type was commonly undifferentiated and serosal infiltration; nodal involvement and lymphatic invasion were more frequent in patients with a Borrmann type IV than in those with other types of cancer. Multivariate analysis confirmed that the extent of lymph node metastasis was a negative prognostic factor for Borrmann type IV gastric carcinomas. The curability for a Borrmann type IV carcinoma was only 53.1%, and peritoneal dissemination rate was 25.9%. The predominant pattern of recurrence for a Borrmann type IV gastric carcinoma was peritoneal dissemination, and it was significantly different with other types (93.1% vs 55.8%, P<0.05). The 5-year survival rate of patients with a Borrmann type IV gastric carcinoma was significantly lower than those of patients with other types of cancer, even though a curative resection had been accomplished (26% vs 63%, p<0.005). The 5-year survival rates of patients with a Borrmann type IV carcinoma following a curative resection were 44.9%, 24%, and 0% for stages II, III and IV, respectively (p<0.05). Conclusion: Because the prognosis for patients of a Borrmann type IV gastric cancer is extremely poor despite a curative resection, preoperative and/or intraperitoneal chemotherapy should be considered. And diagnostic laparoscopy and peritoneal cytology may be used to play an important role in accurate staging workup. (J Korean Gastric Cancer Assoc 2006;6:97-102)
Han, Jae Joon;Ko, Hong Ki;Yoo, Young;Lee, JungHwa;Lee, Kwang Chul;Son, Chang Sung;Lee, Joo Won
Clinical and Experimental Pediatrics
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v.50
no.2
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pp.205-208
/
2007
Purpose : Vascular endothelial cell damage and alteration of a fibrinolytic system was suggested to play a role in the development of coronary artery abnormalities in Kawasaki disease (KD). D-dimer is one of the markers of endothelial damage and fibrinolysis. We evaluated the clinical usefulness of D-dimer to differentiate KD from other febrile diseases and predict coronary artery abnormalities in KD. Methods : Sixty eight patients diagnosed as KD and twenty eight patients presented with acute febrile illnesses other than KD from September 2005 to July 2006 were included. Blood levels of D-dimer and various inflammatory markers were measured before treatment and the clinical course of KD was followed. Serial echocardiography was performed at the onset of disease and thereafter at a monthly interval for at least 2 months. Results : KD patients showed a higher D-dimer level than febrile controls, but the difference was not significant ($1.21{\pm}0.77{\mu}g/mL$ vs $0.92{\pm}0.71{\mu}g/mL$, P=0.083). Neither was the difference between KD patients who had coronary artery abnormalities and those who had not ($1.49{\pm}0.98{\mu}g/mL$ vs $1.15{\pm}0.71{\mu}g/mL$, P=0.169). D-dimer was significantly correlated with other inflammatory markers, such as C-reactive protein and erythrocyte sedimentation rate in both KD patients and febrile controls. Conclusion : D-dimer was not specific for KD. But it may be useful as an inflammatory marker to assess the severity of KD.
Purpose: We analyzed the clinicopathologic features, including treatment and outcome, and the survival rates between young and elderly patients with gastric cancer. Materials and Methods: Clinical information was reviewed for 1086 patients who had undergone a gastrectomy for gastric cancer during a 10-year period from 1990 to 1999, and the patients were assigned to one of two groups: the A group (<40 years of age, 91 patients) and the B group (${\geq}70\;years\;of\;age,\;85\;patients)$). Results: Compared to the B group, the A group had more females (47.3% vs 32.9%), a greater frequency of family history of cancer (15.4% vs 3.5%), and greater proportions of histologically poorly differentiated tumors (84.5% vs 40.2%) and Lauren diffuse-type tumors (69.1% vs 35.1%)(P<0.05). There was no difference in TNM stage. Cardiopulmonary co-morbidities were more in the B group, respectively, 1.1% (A group) and 11.8% (B group)(P<0.01), but the morbidity and the mortality were similar. Although there was no difference in curability, the B group underwent less aggressive operations in lymph-node dissection above D3 and had a shorter operation time, a smaller number of retrieved lymph nodes, and less adjuvant chemotherapy (P<0.001). However, there were no differences in the disease-specific 5-year survival rates, 67.6% and 67.0% respectively. Conclusion: Young and elderly patients with gastric cancer had different clinicopathological features. Especially, elderly patients underwent relatively less aggressive treatment. In spite of these facts, the outcome of treatment and the disease-specific survival rates were not different.
Stark, Alexander P.;Blum, Mariela M.;Chiang, Yi-Ju;Das, Prajnan;Minsky, Bruce D.;Estrella, Jeannelyn S.;Ajani, Jaffer A.;Badgwell, Brian D.;Mansfield, Paul;Ikoma, Naruhiko
Journal of Gastric Cancer
/
v.20
no.3
/
pp.313-327
/
2020
Purpose: Nodal downstaging after preoperative therapy for gastric cancer has been shown to impart excellent prognosis, but this has not been validated in a national cohort. The role of neoadjuvant chemoradiation (NACR) in nodal downstaging remains unclear when compared with that of neoadjuvant chemotherapy alone (NAC). Furthermore, it is unknown whether the prognostic implications of nodal downstaging differ by preoperative regimen. Materials and Methods: Using the National Cancer Database, overall survival (OS) duration was compared among natural N0 (cN0/ypN0), downstaged N0 (cN+/ypN0), and nodepositive (ypN+) gastric cancer patients treated with NACR or NAC. Factors associated with nodal downstaging were examined in a propensity score-matched cohort of cN+ patients, matched 1:1 by receipt of NACR or NAC. Results: Of 7,426 patients (natural N0 [n=1,858, 25.4%], downstaged N0 [n=1,813, 24.4%], node-positive [n=3,755, 50.4%]), 58.2% received NACR, and 41.9% received NAC. The median OS durations of downstaged N0 (5.1 years) and natural N0 (5.6 years) patients were similar to one another and longer than that of node-positive patients (2.1 years) (P<0.001). In the matched cohort of cN+ patients, more recent diagnosis (2010-2015 vs. 2004-2009) (odds ratio [OR], 2.57; P<0.001) and NACR (OR, 2.02; P<0.001) were independently associated with nodal downstaging. The 5-year OS rate of downstaged N0 patients was significantly lower after NACR (46.4%) than after NAC (57.7%) (P=0.003). Conclusions: Downstaged N0 patients have the same prognosis as natural N0 patients. Nodal downstaging occurred more frequently after NACR; however, the survival benefit of nodal downstaging after NACR may be less than that when such is achieved by NAC.
The experiment was carried out at the Yeongnam Crop Experiment Station in 1984 and 1990 to obtain the basic information on kneeing responses of rice cultivars and Echinochloa species. Kneeing response of rice cultivars was not directly related with cultivar group(Tongil-type vs Japonica-type), maturity, culm length, or other agronomic traits and thus concluded that kneeing ability was soly peculiar cultivar character based on its genetic background. Cultivars having relatively great kneeing ability were Yeongdeog 1(Japonica), Seogwangbyeo(Tongil-type). Somjinbyeo(Japonica), Pungsanbyeo(Tongil -type), Hangangchalbyeo(Tongil-type), etc. while these for low kneeing ability cultivars were Chilseoungbyeo, Gayabyeo, and Samgangbyeo that were all belonged to Tongil-types, respectively. Two Echinochloa species were not much differed from each other in kneeing ability. However, kneeing ability of Echinochloa species was much greater than rice cultivars. Kneeing ability of Echinochloa species was not differed by culm node order : all the visual nodes(5~6 nodes) exhibited similar kneeing ability having more or less 30${\circ}$ in each node.
Background: The experience of a single-institution regarding surgery for small cell lung cancer (SCLC) was reviewed to evaluate the surgical outcomes and prognoses. Materials and Methods: From July 1990 to December 2009, thirty-four patients (28 male) underwent major pulmonary resection and lymph node dissection for SCLC. Lobectomy was performed in 24 patients, pneumonectomy in eight, bilobectomy in one, and segmentectomy in one. Surgical complications, mortality, the disease-free survival (DFS) rate, and the overall survival rate were analyzed retrospectively. Results: The median follow-up period was 26 months (range, 4 to 241 months), and there was one surgical mortality (2.9%). Six patients (17.6%) experienced recurrence, all of which were systemic. Eight patients died during follow-up; four died of disease progression and the other four died of pneumonia or of another non-cancerous cause. The three-year DFS rate was $79.2{\pm}2.6%$ and the overall survival rate was $66.4{\pm}10.5%$. Recurrence or death was significantly prevalent in the patients with lymph node metastasis (p=0.001) as well as in those who did not undergo adjuvant chemotherapy (p=0.008). The three-year survival rate was significantly greater in the patients with pathologic stage I/II cancer than in those with stage III cancer (84% vs. 13%, p=0.001). Conclusion: Major pulmonary resection for small cell lung cancer is feasible in selected patients. Patients with pathologic stage I or II disease showed an excellent survival rate after surgery and adjuvant treatment. Prospective randomized studies will be needed to define the role of surgery in early-stage small cell lung cancer.
Background: HER2/neu overexpression due to gene amplification is an important factor in breast cancer, modifying the sensitivity to anti-HER2 monoclonal antibody therapy. The clinical significance of HER2 expression in non small cell lung carcinoma (NSCLC) is currently under evaluation. The tumor suppressor gene PTEN negatively regulates the HER2/PI3K/Akt signalling pathway. The purpose of this study was to evaluate the role of simultaneous alteration in HER2 and PTEN protein expression in relation to biological behaviour of NSCLCs. Materials and Methods: Protein expression was determined by immunohistochemistry in sixty-one (n=61) NSCLC cases along with CISH for HER2 gene analysis and detection of chromosome 17 aneuploidy. Patients were followed-up for a period of 34 to 41 months after surgery. Results: HER2 overexpression (2+/3+score) was detected in 17 (27.9%) patients while loss of PTEN expression was observed in 24 (39.3%) cases, low expression in 29 (47.6%) and overexpression in 8 (13.1%). Simultaneous HER2 overexpression and PTEN low/loss of expression were correlated with metastasis (71.4% vs 36.2% p=0.03). Analysis in the subgroup of 22 patients of pTNM stage III with lymph node status N1 or N2 revealed that there was a relationship between the number of positive regional lymph node groups and simultaneous deregulation of the two genes (p=0.04). Multivariate analysis determined that HER2 overexpression was associated with an increasing risk of developing metastases (OR: 4.3; 95%CI: 1.2-15.9; p: 0.03) while PTEN overexpression was associated with lower risk (OR: 0.1; 95%CI: 0.1, 1.0; p: 0.05). Conclusions: Simultaneous HER2/PTEN deregulation is a significant genetic event that leads to a more aggressive phenotype of NSCLC.
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