• Korean Journal of Radiology
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• 제22권12호
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• pp.1985-1995
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• 2021

Objective: Although the liver-to-spleen volume ratio (LSVR) based on CT reflects portal hypertension, its prognostic role in cirrhotic patients has not been proven. We evaluated the utility of LSVR, automatically measured from CT images using a deep learning algorithm, as a predictor of hepatic decompensation and transplantation-free survival in patients with hepatitis B viral (HBV)-compensated cirrhosis. Materials and Methods: A deep learning algorithm was used to measure the LSVR in a cohort of 1027 consecutive patients (mean age, 50.5 years; 675 male and 352 female) with HBV-compensated cirrhosis who underwent liver CT (2007-2010). Associations of LSVR with hepatic decompensation and transplantation-free survival were evaluated using multivariable Cox proportional hazards and competing risk analyses, accounting for either the Child-Pugh score (CPS) or Model for End Stage Liver Disease (MELD) score and other variables. The risk of the liver-related events was estimated using Kaplan-Meier analysis and the Aalen-Johansen estimator. Results: After adjustment for either CPS or MELD and other variables, LSVR was identified as a significant independent predictor of hepatic decompensation (hazard ratio for LSVR increase by 1, 0.71 and 0.68 for CPS and MELD models, respectively; p < 0.001) and transplantation-free survival (hazard ratio for LSVR increase by 1, 0.8 and 0.77, respectively; p < 0.001). Patients with an LSVR of < 2.9 (n = 381) had significantly higher 3-year risks of hepatic decompensation (16.7% vs. 2.5%, p < 0.001) and liver-related death or transplantation (10.0% vs. 1.1%, p < 0.001) than those with an LSVR ≥ 2.9 (n = 646). When patients were stratified according to CPS (Child-Pugh A vs. B-C) and MELD (< 10 vs. ≥ 10), an LSVR of < 2.9 was still associated with a higher risk of liver-related events than an LSVR of ≥ 2.9 for all Child-Pugh (p ≤ 0.045) and MELD (p ≤ 0.009) stratifications. Conclusion: The LSVR measured on CT can predict hepatic decompensation and transplantation-free survival in patients with HBV-compensated cirrhosis.

• IMMUNE NETWORK
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• 제4권1호
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• pp.1-6
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• 2004

Transplantation would be the only way to cure the end-stage organ failure involving heart, lung, liver, kidney and pancreas. The replacement of the parts of the body damaged to lose its function or lost to trauma must be a dream of human-being. Human history is replete with chimeras, from sphinxes to mermaids, making one wonder if the ancients might actually have dreamed of what now is called 'xenotransplantation'. In the 20th century, the transplantation of organs and tissues to cure disease has become a clinical reality. The development in the fields of surgical techniques, physiology and immunology attributed to the successful transplantation in human. In the center of the successful transplantation lies the progress in understanding the cellular and molecular biology of immune system which led to the development of immunosuppressive drugs and the invention of the concept of immunological tolerance. The mandatory side effects of immunosuppressive drugs including infection and cancer forced us to search alternative approaches along with the development of new immunosuppressive agents. Among the alternative approaches, the induction of a state of immunologic tolerance would be the most promising and the most generic applicability as a future therapy. Recent reports documenting long-term graft survival without immunosuppression suggest that tolerance-based therapies may become a clinical reality. Last year, we saw the epoch making success of overcoming hyperacute rejection in porcine to primate xenotransplantation which will lead porcine to human xenotransplantation to clinical reality. In this review, I dare to summarize the development of transplantation immunology from the perspective of history.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2019년도 춘계학술발표대회
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• pp.348-349
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• 2019

의료영상은 진단을 목적으로 환자의 질환 부위별로 정밀하게 촬영하여 수집된 영상이다. 수집된 의료영상을 판독하여 진단하기 어려운 경우에는 조직검사를 통해 확진검사를 실시한다. 하지만 조직검사의 경우 환자에게 신체적, 경제적 부담을 줄 수 있다. 따라서 의료영상을 기반으로 정밀 진단하는데 도움을 줄 수 있는 정량분석 소프트웨어 개발이 중요하다. 현재 복부 간 질환의 경우 MELD(Model For End-Stage Liver Disease) 점수를 이용하여 간 질환의 중증도나 예후를 예측하는데 이용되고 있다. 하지만 MELD점수 산출에 있어서 의료영상 정보를 사용하지 않았기 때문에 질환 여부를 가늠하는데 에만 이용될 뿐 병변부위의 위치를 확인하는데 에는 어려움이 있다. 그러므로 본 논문은 다양한 의료영상장비에서 획득한 복부영상을 이용하여 복부질환의 중증도를 예측 및 분석함으로서 실제 임상진단에 도움을 줄 수 있는 시스템을 제안하고자 한다.

• Korean Journal of Radiology
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• 제22권2호
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• pp.189-197
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• 2021

Objective: Muscle depletion in patients undergoing liver transplantation affects the recipients' prognosis and therefore cannot be overlooked. We aimed to evaluate whether changes in muscle and fat mass during the preoperative period are associated with prognosis after deceased donor liver transplantation (DDLT). Materials and Methods: This study included 72 patients who underwent DDLT and serial computed tomography (CT) scans. Skeletal muscle index (SMI) and fat mass index (FMI) were calculated using the muscle and fat area in CT performed 1 year prior to surgery (1 yr Pre-LT), just before surgery (Pre-LT), and after transplantation (Post-LT). Simple aspects of serial changes in muscle and fat mass were analyzed during three measurement time points. The rate of preoperative changes in body composition parameters were calculated (preoperative ΔSMI [%] = [SMI at Pre-LT - SMI at 1 yr Pre-LT] / SMI at Pre-LT x 100; preoperative ΔFMI [%] = [FMI at Pre-LT - FMI at 1 yr Pre-LT] / FMI at Pre-LT x 100) and assessed for correlation with patient survival. Results: SMI significantly decreased during the preoperative period (mean preoperative ΔSMI, -13.04%, p < 0.001). In the multivariable analysis, preoperative ΔSMI (p = 0.016) and model for end-stage liver disease score (p = 0.011) were independent prognostic factors for overall survival. The mean survival time for patients with a threshold decrease in the preoperative ΔSMI (≤ -30%) was significantly shorter than for other patients (p = 0.007). Preoperative ΔFMI was not a prognostic factor but FMI increased during the postoperative period (p = 0.009) in all patients. Conclusion: A large reduction in preoperative SMI was significantly associated with reduced survival after DDLT. Therefore, changes in muscle mass during the preoperative period can be considered as a prognostic factor for survival after DDLT.

• Clinical and Experimental Pediatrics
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• 제57권3호
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• pp.135-139
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• 2014

Purpose: Adult Korean patients on chronic dialysis have a 9-year survival rate of 50%, with cardiovascular problems being the most significant cause of death. The 2011 annual report of the North American Pediatric Renal Trials and Collaborative Studies group reported 3-year survival rates of 93.4% and relatively poorer survival in younger patients. Methods: In this study, we have reviewed data from Korean Pediatric Chronic Kidney Disease Registry from 2002 to 2010 to assess survival rates and causes of death in Korean children on chronic dialysis. Results: The overall estimated patient survival rates were 98.4%, 94.4%, and 92.1% at 1, 3, and 5 years, respectively. No significant difference was observed in survival rates between patients on peritoneal dialysis and those on hemodialysis. Patients for whom dialysis was initiated before 2 years of age (n=40) had significantly lower survival rates than those for whom dialysis was initiated at 6-11 years of age (n=140). In all, 26 patients had died; the mortality rate was 19.9 per 1,000 patient years. The most common causes of death were infections and comorbidities such as malignancy and central nervous system (CNS) or liver diseases. Conclusion: The outcomes observed in this study were better than those observed in adults and comparable to those observed in pediatric studies in other countries. To improve the outcomes of children on chronic dialysis, it is necessary to prevent dialysis-related complications such as infection, congestive heart failure, or CNS hemorrhage and best control treatable comorbidities.

• 대한영상의학회지
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• 제85권2호
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• pp.381-393
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• 2024

목적 간성뇌증(hepatic encephalopathy; 이하 HE)의 대사이상은 뇌부종 또는 탈수초성 질환을 일으켜 자기공명영상에서 대칭적인 지역 뇌부종을 유발한다. 본 연구에서 HE 환자의 뇌 자기공명영상에서 대칭적인 지역 뇌부종 패턴의 군집화 분석을 통해 뇌부전 발생 예측의 유용성을 조사하는 것을 목적으로 한다. 대상과 방법 연속적인 HE 환자 98명을 대상으로 MR 소견과 임상자료를 후향적으로 분석하였다. Symmetric regional cerebral edema (이하 SRCE)의 12개 영역 간의 상관관계는 파이(φ) 계수를 사용하여 계산하였고, φ² 거리 측정과 Ward의 방법을 사용하여 계층적 군집화를 사용하여 패턴을 분류하였다. SRCE의 분류된 패턴은 말기 간 질환 모델(model for endstage liver disease; 이하 MELD) 점수 및 HE 등급과 같은 임상과 상관관계를 조사하였다. 결과 적색 핵과 뇌량(φ = 0.81, p < 0.001), 대뇌 십자 및 적색 핵(φ = 0.72, p < 0.001), 적색핵과 치상핵(φ = 0.66, p < 0.001)을 포함한 22쌍의 관심영역 사이에 유의한 연관성이 발견되었다. 계층적 군집화 후 24건을 I군, 35건을 II군, 39건을 III군으로 분류하였다. 그룹 III은 그룹 I에 비해 MELD 점수(p = 0.04)와 HE 등급(p = 0.002)이 더 높았다. 결론 본 연구는 HE 환자에서 대칭적인 지역 뇌부종의 패턴은 간 보존 및 뇌부전 발생을 예측하는 데 유용할 수 있음을 보여주었다.

• Journal of Chest Surgery
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• 제49권3호
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• pp.157-164
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• 2016

Background: Heart-lung transplantation (HLT) has provided hope to patients with end-stage lung disease and irreversible heart dysfunction. We reviewed the clinical outcomes of 10 patients who underwent heart-lung transplantation at Asan Medical Center. Methods: Between July 2010 and August 2014, a total of 11 patients underwent HLT at Asan Medical Center. After excluding one patient who underwent concomitant liver transplantation, 10 patients were enrolled in our study. We reviewed the demographics of the donors and the recipients' baseline information, survival rate, cause of death, and postoperative complications. All patients underwent follow-up, with a mean duration of $26.1{\pm}16.7months$. Results: Early death occurred in two patients (20%) due to septic shock. Late death occurred in three patients (38%) due to bronchiolitis obliterans (n=2) and septic shock (n=1), although these patients survived for 22, 28, and 42 months, respectively. The actuarial survival rates at one year, two years, and three years after HLT were 80%, 67%, and 53%, respectively. Conclusion: HLT is a procedure that is rarely performed in Korea, even in medical centers with large heart and lung transplant programs. In order to achieve acceptable clinical outcomes, it is critical to carefully choose the donor and the recipient and to be certain that all aspects of the transplant procedure are planned in advance with the greatest care.

• Radiation Oncology Journal
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• 제9권2호
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• pp.285-291
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• 1991

1981년 1월부터 1988년 12월까지 고려대학교 의과대학 치료방사선과에서 제1기에서 2기초까지의 자궁경부악성종양으로 방사선치료를 받았던 126명의 환자를 수술과 방사선치료의 병행요법군(66)과 단독방사선치료(60)군의 두군으로 나누어 그 치료실패의 양상과 요인을 분석하였다. 총 126명 중 29명인 23$\%$의 환자에서 국소재발이나 원격전이를 보였으며 각 군 사이에 병기별로 의미있는 차이를 보이지는 않았다. 29명 중 25명인 86$\%$의환자에서 치료종결후 18개월이내에 치료실패를 보였으며 원격전이의 평균 시기는 국소적인 재발보다 빨라 약 60$\%$의 원격 전이 가 6개월 이내에 발생되었다. 첫 원격전이의 장소로는 단독방사선군에서는 주로 복부임파절이나 쇄골 상부임파절이 많았던 반면 병행요법군에서는 이를 제외한 원격임파절, 폐, 간 및 골전이가 많았던 것으로 나타났으며 이는 통계학적인 유의성이 있었다. 각 군에서 치료실패에 기여하는 요소를 알아내기 위해 조직병리학적, 또는 임상적인 위험요소들에 대해 다변수 분석을 시행한 결과 병행요법군에서는 불충분한 제거 범위 (p=0.0423) 및 전이 성 골반임파절 (p=0.0060)의 존재가, 단독요법군에서는 치료 종결시 종양의 불완전관해(p=0.0013)가 가장 의미있는 요소로 관찰되었다.

• Asian Pacific Journal of Cancer Prevention
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• 제17권8호
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• pp.4077-4082
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• 2016

Background: Hepatocellular carcinoma (HCC) is a dreadful complication of end stage liver disease with high morbidity and mortality. Aim: The aim was to assess the role of serum talin-1 and non-invasive fibrosis in patients with HCC. Materials and Methods: A total of eighty seven subjects were enrolled, with 22 two healthy individuals as a control group (n=22), 22 patients in the cirrhosis group and finally 43 in the group with HCC diagnosed with positive triphasic CT abdomen criteria. Serum talin-1 and noninvasive fibrosis parameters were assessed in all subjects. Results: Compared to the cirrhosis group, patients with HCC had higher serum talin-1 ($32.9{\pm}12.6$ vs. $11.1{\pm}2.79ng/ml$), FIB4 ($9.96{\pm}15.3$ vs. $2.90{\pm}1.87$) and $fibro-{\alpha}$ ($10.9{\pm}18.1$ vs. $1.55{\pm}0.28$) but not fibrosis index scores ($4.47{\pm}0.95$ vs. $4.98{\pm}0.96$; p=0.046). Patients with large focal lesions (${\geq}5cm$) had different ALBI scores ($-1.02{\pm}0.63$ vs. $-1.72{\pm}0.59$; p=0.001) serum talin-1 ($9.72{\pm}13.81$ vs. $28.6{\pm}38.89ng/ml$; p=0.007) and fibrosis index scores ($0.85{\pm}0.99$ vs. $4.20{\pm}4.85$; p=0.026). No statistical differences were noted between patients with and without portal vein thrombosis. For detection of HCC, serum talin-1 had 97.7% sensitivity and 100% specificity with a 17.2 ng/ml cutoff. AFP at a 13.7 ng/ml cutoff had 72.1% sensitivity and 6.3.6% specificity. The cutoff for the $fibro-{\alpha}$ score was 1.61 with 81.4% sensitivity and 77.3% specificity. Serum talin-1 (odds=1.08; C.I=1.016-1.150; p=0.014), fibrosis index score (odds=2.35; C.I=1.055-5.217; p=0.037) and the ALBI score (odds=6.9; C.I=1.924-24.708; p=0.003) were predictors of large focal lesions. Conclusions: Serum talin-1, AST/ALT ratio, $fibro-{\alpha}$ score are useful for the assessment of HCC patients.

• Radiation Oncology Journal
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• 제16권1호
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• pp.17-25
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• 1998

목적 : 위암치료에 있어 완전절제수술후 임상적 국소재발이 $30-40\%$에 이르는 것으로 보고되고 있으나 수술 후 항암화학요법이나 방사선 치료의 시행은 아직 그 역할이 분명치 않다. 반면 완전절제가 이루어지지 않은 위암에서는 원발병소 부위의 국소발소 위험성이 매우 높아 추가적인 국소치료의 필요성이 제기되고 있으나 이에 대한 구체적인 연구는 아직 미미한 실정이다. 이에 저자 등은 불완전 절제된 위암에서 수술후 방사선치료가 국소재발을 줄일 수 있는지, 또한 생존율향상을 얻을 수 있는지 알기 위하여 본 연구를 시행하였다. 대상 및 방법 : 1991년 7월부터 1996년 8월까지 울산의대 서울중앙병원에서 위암 진단하에 근치적 절제수술을 시행하였으나 불완전 절제된 25명의 환자에서 수술후 방사선 치료를 시행하였다. 전체 25명의 환자 중 선세포암이 23명, 평활근육종이 2명이었고, 수술은 위전절제수술(Total gastrectomy) 5명, 위부분절제술(Subtotal gastrectomy) 20명이었다. 병기별로는 I B 1명, II 2명, III A 11명, III B 10명, IV 1댕이었으며 불완전 절제부위는 원위절제면(dlstal resection margin) 17명, 근위절제면(proxlmal resection margin) 5명, 간 절제면 1명 및 기타 장기 절제면 2명이었다. 방사선 치료는 총 6회의 FP 항암화학요법중 회차와 동시에 시작되는 것을 원칙으로 하였으며 조사선량은 44.6Gy-59.4Gy 범위였고 중앙선량은 55.8Gy였다. 결과 : 1명을 제외한 모든 환자가 정해진 양의 방사선 치료를 마칠 수 있었으며, 3명의 환자에서 $15\%$ 이상의 체중감소가 있었고 중증도 3 이상의 혈액학적 독성은 5명에서 관찰되었다. 최소 추적관찰기간은 12개월이었다. 전체 25명중 12명에서 재발이 있었으며 조사야내 국소재발은 7명에서 발생하였고 이들은 문합부위재발 3명, 인접조직 3명, 임파절 1명이었다. 반면 원격전이는 10명에서 발생하였고 이들은 복막전이 6명, 간 전이 2명, 쇄골상임파절 및 대동맥 임파절등 원위임파절 전이가 3명이었다. 환자의 현 상태는 무병생존 11명, 위암과 관련 없는 사망 2명, 위암으로 인한 사망 10명, 재발상태의 생존 2명 등이다. 4년 무병생존율과 질병관련생존율(disease specific survival)은 각각 $48\%$와 $40\%$였으며 중앙생존값은 35개월, 중앙무병생존값은 26개월이었다. 원발병소 위치, T-stage, N-stage, Stage, 방사선량 등은 생존율에 별다른 영향을 미치지 못하였다. 결론 : 수술후 방사선치료와 항암화학요법은 큰 부작용 없이 시행되었으며 치료후 실패양상은 원격전이가 가장 많았고 국소재발은 7명($28\%$)에서 발생하여 문헌상 관찰된 완전절제수술후 국소재발수치과 비슷하거나 낮은 것으로 나타났다 추적관찰 기간이 짧고 환자 수가 적어 단정짓기는 어렵지만 불완전 절제수술 후 원발병소 부위에 잔류암세포가 존재하는 상태인 점을 고려할 때, 불완전 절제된 위암에서 방사선치료가 국소재발을 억제에 기여했을 가능성이 크다고 생각된다.