• 대한종양외과학회지
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• 제14권2호
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• pp.128-134
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• 2018

Purpose: Previous studies have addressed the role of the hypercoagulable state in the pathogenesis of cancer progression and metastasis. In this study, we investigated the association between coagulation factors, including tissue factor (TF) expression, platelet count, and fibrinogen level, and disease recurrence in patients with non-metastatic colorectal cancer. Methods: Patients who underwent curative resection for stage II or III colorectal cancer between 2000 and 2007 were included in this study. Data from a prospectively maintained database were retrospectively reviewed. TF expression was determined by immunohistochemistry using an anti-TF monoclonal antibody. The Kaplan-Meier method was used to estimate 5-year disease-free survival. Results: TF was highly expressed in 257 of 297 patients (86.5%). TF expression was not significantly associated with the platelet counts (P=0.180) or fibrinogen level (P=0.281). The 5-year disease-free survival rate was lower in patients with high TF expression than in patients with low TF expression (72.3% vs. 83.9%, P=0.074). In Cox hazard analysis, high TF expression was an independent risk factor for tumor recurrence (hazard ratio [HR] 2.446; 95% confidence interval [CI], 1.054-5.674; P=0.037). Undifferentiated histologic type (HR, 2.911; 95% CI, 1.308-6.481; P=0.009), venous invasion (HR, 2.784; 95% CI, 1.431-5.417; P=0.003), and lymph node metastasis (HR, 2.497; 95% CI, 1.499-4.158; P<0.001), were also significantly associated with disease recurrence. Conclusion: TF expression is associated with a recurrence in patients with non-metastatic colorectal cancer. However, further studies are required to clarify the underlying mechanisms relating TF expression with oncologic outcomes and its potential role as a therapeutic target.

• Korean Circulation Journal
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• 제52권5호
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• pp.368-378
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• 2022

Background and Objectives: Recurrence rates after radiofrequency catheter ablation (RFCA) in atrial fibrillation (AF) patients are not low especially in non-paroxysmal AF. The diameter of left atrium (LA) has been widely used to predict the recurrence after RFCA for decades. However, LA diameter represents structural remodeling of LA and does not reflect electrical remodeling. We aimed to determine the predictive value of electrical remodeling of LA which is represented by the amount of low voltage zone (LVZ). Methods: We performed a retrospective cohort analysis of AF patients who underwent de novo RFCA in a single-center. Results: A total of 3,120 AF patients with de novo RFCA were analyzed. Among these patients, 537 patients underwent an electroanatomic mapping with bipolar voltage measurement of LA. The diameter of LA and flow velocity of LA appendage (LAA) differed significantly according to quartile group of LVZ area and percentage: patients with high LVZ had large LA diameter and low LAA flow velocity (p<0.001). Freedom from late recurrence (LR) was significantly lower in patients with high LVZ area and percentage (p<0.001). The diameter and surface area of LA had area under curve (AUC) of 0.592 and 0.593, respectively (p=0.002 for both). The predictive value of LVZ area (AUC, 0.676) and percentage (AUC, 0.671) were both superior compared with LA diameter (p=0.011 and 0.027 for each comparison). Conclusions: In conclusion, LVZ can predict freedom from LR after RFCA in AF patients. Predictive value was higher in parameters reflecting electrical rather than structural remodeling of LA.

• Asian Pacific Journal of Cancer Prevention
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• 제17권5호
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• pp.2711-2717
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• 2016

Background: Through search the possible randomized control trials, we make a renewed meta-analysis in order to assess the impact of aspirin in preventing the recurrence of colorectal adenoma. Materials and Methods: The Medicine/PubMed, Embase, Cochrane Central Register of Controlled Trials (CENTRAL), Chinese biomedical literature service system (SinoMed) databases were searched for the related randomized controlled trials until to the April 2016. Three different authors respectively evaluated the quality of studies and extracted data, and we used the STATA software to analyze, investigate heterogeneity between the data, using the fixed-effects model to calculate and merge data. Results: 7 papers were included the renewed meta-analysis, among these studies, two pairs were identified as representing the same study population, with the only difference being the duration of follow-up. Thus there were only five papers included our meta-analysis, and one Chinese paper were also included the work. Results were categorized by the length of follow-up, different kinds of people, varied dose of oral aspirin. The relative of adenoma in patients taking aspirin vs placebo were 0.73 (95% CI 0.55-0.98, P=0.039) with 1 year follow up; 0.84 (95% CI 0.72-0.98, P=0.484) with greater than 1 year follow up; for the advanced adenoma, the RR 0.68 (95% CI 0.49-0.94, P=0.582),for one year; RR=0.75 (95% CI 0.52-1.07, P=0.552) for greater one year. Furthermore the white population could divided into two subgroups according to the different length of follow-up time. When the length of follow-up time less than 3-year, The RR of two subgroups respective were RR=0.86 (95% CI 0.76-0.98, P=0.332), $I^2=0%$, RR=0.68 (95% CI 0.47-0.98, P=0.552), $I^2=64.6%$, But with the extension of follow-up time greater than 2-year, with the white, oral aspirin without considering dose had no efficacy on preventing the recurrence of any adenoma, the RR was 0.86 (95% CI 0.71-1.05, P=0.302), $I^2=16.4%$. Conclusions: This meta-analysis indicated that oral aspirin is associated with a remarkable decrease in the recurrence of any adenoma and advanced adenomas in patients follow-up for 1 year without concerning the dose of aspirin, but with the extension of follow-up time for greater than 1 year, oral aspirin can be effective on preventing the recurrence of any adenoma, but for the advanced adenoma, the result indicated that oral aspirin had no efficacy, According to the inclusion of ethnic groups, we also divided relevant papers into two subgroups as the yellow and white group. Then the follow-up time was less than 3 years, oral aspirin without considering the dose, had an significant efficacy on preventing the recurrence of any adenoma. But with the follow-up greater than 2 years, oral aspirin had no effect in the white.

• Asian Pacific Journal of Cancer Prevention
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• 제15권2호
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• pp.775-780
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• 2014

Objectives: TCR-gamma-delta+T cells (${\gamma}{\delta}$ T cells) are non-conventional T lymphocytes that can recognize and eradicate tumor cells. Our previous studies showed that infiltration and function of ${\gamma}{\delta}$ T cells were substantially attenuated in hepatocellular carcinoma (HCC). However, their prognostic value was not clarified. Methods: The association between ${\gamma}{\delta}$ T cells and the clinical outcomes was determined by immunohistochemistry (IHC) in a HCC patient cohort (n = 342). Results:Immunohistochemistry showed decreased infiltration of ${\gamma}{\delta}$ T cells in tumoral tissues compared with paired peritumoral tissues. The counts of ${\gamma}{\delta}$ T cells in peritumoral tissues were negatively correlated with tumor size (P = 0.005). Survival analysis showed that the levels of peritumoral ${\gamma}{\delta}$T cells were related to both time to recurrence (TTR) and overall survival (OS) (P = 0.010 and P = 0.036, respectively) in univariate analysis, and related to TTR in multivariate analysis (P = 0.014, H.R. [95% CI] = 0.682 [0.502-0.927]). Furthermore, the level of peritumoral ${\gamma}{\delta}$ T cells showed independent prognostic value for TTR in Barcelona Clinic Liver Cancer (BCLC) stage A patients (P = 0.038, H.R. [95% CI] = 0.727 [0.537-0.984]). However, tumoral ${\gamma}{\delta}$ T cells did not show independent prognostic value for either TTR or OS in HCC patients. Conclusions: Low counts of ${\gamma}{\delta}$ T cells in peritumoral liver tissue are related to a higher incidence of recurrence in HCC and can predict postoperative recurrence, especially in those with early-stage HCC.

• Journal of the Korean Statistical Society
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• 제3권2호
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• pp.103-115
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• 1974

During the last few years there has been an interest in models for qualitative attributes, where complex signifies that affection may be caused in two or more ways [1-3]. These models have in common the prediction of variable recurrence risks among families with given parental phenotpes. Segregation analysis has covered only a few cases [4,5]. The present paper extends segregation analysis to three complex models under two mode of ascertainment.

• Asian Pacific Journal of Cancer Prevention
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• 제16권12호
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• pp.5101-5106
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• 2015

Background: This systemic analysis was conducted to evaluate tumor recurrence rate and one-year survival rate for patients with liver metastases received radiofrequency ablation after transarterial chemoembolization and introduce a new method of radiofrequency ablation by puncture navigation technology for single liver metastases after transarterial chemoembolization. Materials and Methods: Clinical studies evaluating tumor recurrence rate and one-year survival rate. Appling the innova trackvision software to process one liver metastases received transarterial chemoembolization and using radiofrequency ablation by puncture navigation technology to treat the liver metastases. Results: 3 clinical studies which including 235 patients with liver metastases after transaeterial chemoembolization were considered eligible for inclusion. Systemic analysis suggested that tumor recurrence rate was 23% (54/235), one-year survival rate was 76% (178/235). The new procedure was performed successfully and the patient received a good prognosis. Conclusions: This systemic analysis suggests that radiofrequency ablation is a good method for liver metastases after transarterial chemoembolization and could receive a relatively good prognosis.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제31권2호
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• pp.170-177
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• 2005

The pleomorphic adenoma is well recognized as the most common salivary neoplasm. We examined 49 patients who had received surgical excision of the pleomorphic adenoma from 1989 to 1998 with over 5 years follow-up period. We retrospectively evaluated the patients' age, sex, chief complaints, surgical methods, and recurrence or complication rates after analysis of one's clinical and surgical records. The results are as follows : 1. There were 15 cases in parotid gland, 23 cases in palate, 8 cases in submandibular gland, and 3 cases in cheek. The ratio of male to female was 1 : 1.13. The mean age was 44. The tumor of submandibular gland occurred in more younger age than that of other salivary gland. 2. In 15 patients of parotid pleomorphic adenoma, there was 1 case(6.7%, 1/15) of recurrence. That was transformed into the malignant pleomorphic adenoma after 4 years of first surgery. We performed superficial parotidectomy of 9 cases(56.2%, 9/16), total parotidectomy of 6 cases(37.5%, 6/16), and radical parotidectomy of 1 case(6.3%, 1/16). 3. We used the rotational Sternocleidomastoid muscular flap to cover the exposed facial nerve in 12 cases(75%) after parotidectomy(7 cases of superficial parotidectomy and 5 cases of total parotidectomy). We could see 3 cases(18.7%) of facial nerve palsy and 1 case(6.3%) of Frey's syndrome after parotidectomy. We examined Frey's syndrome in only 1 case which was not used SCM muscular flap after parotidectomy. 4. In 23 patients of palatal pleomorphic adenoma, there were 2 cases(8.7%) of recurrence. In recurrence cases, We performed re-excision after 4 and 5 years of first surgery, respectively. We preserved partial thin overlying palatal mucosa during tumor excision in 5 cases(20%), which were proved as benign mixed tumor in preoperative biopsy. That mucosa-preserved cases had thick palatal mucosa, did not show mucosa ulceration and revealed well encapsulated lesions in preoperative CT. 5. In palatal tumors, we could see the 13 cases(52%) of bony invasion in preoperative CT views and the 4 cases(16%) of oro-nasal fistula after tumor excision. In two cases of recurrence, one(20%, 1/5) was in palatal mucosa-preserved group and the other(5.5%, 1/18) was in palatal mucosa-excised group. 6. We excised tumors with submandibular glands in the all cases of submandibular pleomorphic adenoma. There was no specific complication or recurrence in these cases. 7. After excision of the cheek pleomorphic adenomas, we could not see any complication or recurrence.

• 한국전산구조공학회논문집
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• 제14권4호
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• pp.469-479
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• 2001

본 연구에서는 다층 층간분리된 적층보의 자유진동해석을 수행하였다. 적층보에 존재하는 다층 층간분리가 고유진동수에 미치는 영향을 고찰하기 위해 층간분리단에서의 연속조건을 유도하고, 층간분리된 각각의 분할보의 경계에서 유도된 연속조건을 이용하여 진동수 방정식을 유도하였다. 이론해석결과의 검증을 위해 범용 프로그램을 이용한 유한요소해석을 수행하였으며, 서로 잘 부합됨을 보였다. 고유진동수 변화는 다층 층간분리의 크기와 위치 및 형태에 따라 변하였다. 얻어진 결과로부터 다층 층간분리가 적층보의 동적특성에 미치는 민감도와 층간분리의 위치와 크기를 탐지하는데 활용될 수 있는 가능성을 제시하였다.

• Journal of Chest Surgery
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• 제38권6호
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• pp.421-427
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• 2005

완전절제는 pT1/2N1 비소세포폐암의 가장 효과적인 치료 방법이지만 수술 후 5년 생존율은$40\%$정도이며 많은 환자가 암의 재발로 사망하게 된다. 완전 절제된 pT1/2Nl 비소세포폐암에서 재발에 영향을 주는 인자를 규명하고자 하였다. 대상 및 방법: 1990년 1월부터 2003년 7월까지 연세대학교 의과대학 세브란스병원 흉부외과에서 pT1/2N1 비소세포폐암으로 수술받은 환자 117명을 대상으로 환자의 특성, 조직병리학적 소견, 수술방법, 림프절 전이 양상, 술 후 보조요법 등과 재발과의 관계를 후향적으로 연구하였다. 결과: 전체 환자의 평균 연령은 $59.3\pm9.1$세였으며 T1N1이 14명, T2N1이 103명이었다. 추적관찰기간은 27.5개월이었으며 5년 생존율은 $41.3\%$였다. 수술 후 재발은 44명$(37.6\%)$에서 관찰되었으며 원격전이가 40명이었다. 재발한 환자의 5년 생존율은 $3.3\%$로 재발이 없는 환자$(61.3\%)$에 비해 유의하게 낮았으며(p=0.000), 전체 환자의 5년 무재발률(freedom-from recurrence rate)은 $54.1\%$였다. 무재발률에 영향을 미치는 요인에 대한 다변량 분석 결과 다림프절군 N1 (multi-station N1)이 단일림프절군 N1 (single station N1)에 비해 재발의 위험도가 1.997배 높았다(p=0.047). 걸론: 완전 절제된 pT1/2N1 비소세포폐암 환자들에서 다림프절군 N1이 수술 후 재발의 위험인자였다.

• 대한소아신경학회지
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• 제26권4호
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• pp.210-214
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• 2018

목적: 열성경련과 철 결핍성 빈혈간의 상관관계는 몇몇 연구에서 밝혀져 왔다. 하지만 단순 열성경련과 복합 열성경련에서 철 결핍성 빈혈의 역할을 확인한 연구는 적으며 열성경련 재발의 위험인자가 될 수 있는지 확인한 연구는 없었다. 본 연구의 목표는 단순 열성경련과 복합 열성경련에서 철 결핍성 빈혈의 역할을 알아보고 철 결핍성 빈혈이 열성경련의 재발에 미치는 영향을 확인하는 것이다. 방법: 2011년 1월부터 2018년 4월까지 중앙대병원에서 열성경련으로 진단받고 2년이상 추적관찰을 받았던 166명의 소아에 대해 연구를 진행하였다. 환자들은 다음과 같은 군으로 나뉘어 분석되었다: 단순 열성경련과 복합 열성경련, 재발이 있었던 환자와 없었던 환자. 각 그룹에서 발병시의 나이를 비교하였고 빈혈 여부를 확인하기 위한 진단검사 결과들을 비교하였다. 결과: 단순 열성경련과 복합 열성경련 군에서 철 결핍성 빈혈과 관련된 진단검사 결과는 두 군 간에 유의한 차이가 없었다. 발병 시 나이는 두 군 간에 유의한 차이를 보였고 복합 열성경련 군에서 낮은 경향을 보였다(24.00과 16.49개월) (P=0.004). 남성과 여성의 비율은 두 군 간에 차이가 없었다. 재발한 군과 재발이 없던 군을 비교할 때 평균 적혈구 용적이 유의한 차이를 보였고(P=0.043) 재발이 있던 군에서 유의하게 더 낮았다(78.92와 77.48 fl). 발병 시 나이는 재발이 있던 군에서 더 어렸다 (26.02와 19.68 개월). 결론: 본 연구에서 발병 시 나이가 복합 열성경련의 위험인자가 될 수 있음을 확인하였고 철 결핍성 빈혈이 복합 열성경련의 위험도를 올리지 않을 수 있다는 것을 알 수 있었다. 하지만 철 결핍성 빈혈은 열성경련의 재발과 연관이 있는 것으로 보인다.