• Journal of Gastric Cancer
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• 제5권3호
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• pp.163-168
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• 2005

목적: 본 연구에서는 제5판 UICC (International Union Against Cancer) 림프절 병기와 일본 위암 학회 림프절 병기를 분석하여 병기별 분포와 예후의 차이점을 알아보고자 하였다. 그리고 UICC N3M0 위암 환자들을 여러 림프절 전이군으로 분류하여 예후 예측에서 효용성을 알아보고자 하였다. 대상 및 방법: 1990년 2월부터 2000년 5월까지 지방공사 서울 의료원 및 한림대학교 성심병원에서 진행 위암으로 근치적 절제 수술을 받은 환자 197예를 대상으로 하여 두 가지 병기의 연관성 및 예후 예측의 차이를 분석하였다. 그리고 UICC N3M0군으로 분류된 58예를 세 가지의 림프절 병기 분류 방법으로 분석하였다. 결과: UICC 림프절 병기 N1, N2, N3의 5년 생존율은 각각 62.9%, 33.0%, 21.2%였다. 일본 위암 학회 림프절 병기 n1, n2의 5년 생존율은 각각 61.2%, 25.3%였다 N3M0군에서 일본 위암 학회 병기 n1의 5년 생존율이 각각 62.5%였고, 전이 림프절 비율 0.5 미만, 전이 림프절 수 26개 미만인 군에서는 각각 33.0%, 22.9%로 통계학적으로 의미 있게 0.5이상, 26개 이상의 군보다 좋은 예후를 보였다(P=0.018, 0.021). 결론: UICC 림프절 병기 체계는 예후 예측 능력에서 일본식 림프절 병기보다 더 우수했다. N3M0 병기 위암환자에서 전이 림프절 비율, 전이 림프절 수는 의미 있는 예후 인자였다.

• Journal of Gastric Cancer
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• 제15권4호
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• pp.238-245
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• 2015

Purpose: This study aimed to identify time-dependent prognostic factors and demonstrate the time-dependent effects of important prognostic factors in patients with advanced gastric cancer (AGC). Materials and Methods: We retrospectively evaluated 3,653 patients with AGC who underwent curative standard gastrectomy between 1991 and 2005 at the Korea Cancer Center Hospital. Multivariate survival analysis with Cox proportional hazards regression was used in the analysis. A non-proportionality test based on the Schoenfeld residuals (also known as partial residuals) was performed, and scaled Schoenfeld residuals were plotted over time for each covariate. Results: The multivariate analysis revealed that sex, depth of invasion, metastatic lymph node (LN) ratio, tumor size, and chemotherapy were time-dependent covariates violating the proportional hazards assumption. The prognostic effects (i.e., log of hazard ratio [LHR]) of the time-dependent covariates changed over time during follow-up, and the effects generally diminished with low slope (e.g., depth of invasion and tumor size), with gentle slope (e.g., metastatic LN ratio), or with steep slope (e.g., chemotherapy). Meanwhile, the LHR functions of some covariates (e.g., sex) crossed the zero reference line from positive (i.e., bad prognosis) to negative (i.e., good prognosis). Conclusions: The time-dependent effects of the prognostic factors of AGC are clearly demonstrated in this study. We can suggest that time-dependent effects are not an uncommon phenomenon among prognostic factors of AGC.

• Asian Pacific Journal of Cancer Prevention
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• 제15권16호
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• pp.6727-6732
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• 2014

Objectives: Advanced gastric cancer (AGC) patients have a poor prognosis. The best benefit of chemotherapy is usually achieved by first line setting. Very few studies have compared combination regimens. This study was designed to compare two combination regimens. Methods: Patients with advanced gastric cancer receiving first line chemotherapy were retrospectively collected, and divided into two groups, receiving DCF (docetaxel, cisplatin and fluorouracil) or ECF (epirubicin, cisplatin and fluorouracil) regimens. Data were collected for the retrospective analysis in a single center. Results: Eighty-six patients were eligible for analysis. Median overall survival (OS) was 10.0 months in the ECF group and 11.0 months in the DCF group (p=0.31). Median progression free survival (PFS) for ECF and DCF was equal at 6.0 months. Second line chemotherapy were administered in more than one third of patients. Both regimens had similar toxicity. Conclusions: This is the first study investigating the outcomes of gastric cancer chemotherapy in this region. ECF and DCF regimens have similar efficacy and a similar tolerability profile for first line treatment of advanced gastric cancer. The decision of the first line chemotherapy in advanced gastric cancer could be improved with patient selection according to clinical parameters and molecular markers.

• Journal of Digestive Cancer Research
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• 제4권2호
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• pp.122-126
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• 2016

Leptomeningeal carcinomatosis occurs in approximately 5% of patients with cancer. The most common cancers involving the leptomeninges are breast, lung cancer and melanoma. However, gastric adenocarcinoma has been rarely reported with leptomeningeal carcinomatosis. The presenting manifestations are usually headache, visual disturbances and seizures. We report a case of leptomeningeal metastasis that presented as a gastric cancer. A 75-year old man was transferred to our hospital for further evaluation and treatment after being diagnosed with adenocarcinoma through endoscopic biopsy during a regular health examination. An abdominal computed tomography (CT) showed AGC, stage IA (cT1N0M0), while an endoscopic examination showed AGC, Borrmann type 2. The patient is currently under observation after undergoing radical subtotal gastrectomy with gastroduodenostomy and subsequent administration of oral chemotherapeutic agents. As an abdominal CT response assessment performed after surgery revealed new metastasis to the liver, the patient received palliative chemotherapy as recurrence was suspected. After receiving chemotherapy in the order of DP (Cisplatin + Docetaxel), FOLFIRI (5-FU + Leucovorin + Irinotecan), an abdominal CT response assessment showed complete response. Since decreased mentality maintained throughout the follow up period based on outpatient clinic, brain MRI was performed and revealed multiple leptomeningeal metastasis. The Patient died 2 days after the diagnosis.

• Journal of Gastric Cancer
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• 제23권3호
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• pp.476-486
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• 2023

Purpose: The optimal tumor mutational burden (TMB) value for predicting treatment response to programmed cell death-1 (PD-1) checkpoint inhibitors in advanced gastric cancer (AGC) remains unclear. We aimed to investigate the optimal TMB cutoff value that could predict the efficacy of PD-1 checkpoint inhibitors in AGC. Materials and Methods: Patients with AGC who received pembrolizumab or nivolumab between October 1, 2020, and July 27, 2021, at Samsung Medical Center in Korea were retrospectively analyzed. The TMB levels were measured using a next-generation sequencing assay. Based on receiver operating characteristic curve analysis, the TMB cutoff value was determined. Results: A total 53 patients were analyzed. The TMB cutoff value for predicting the overall response rate (ORR) to PD-1 checkpoint inhibitors was defined as 13.31 mutations per megabase (mt/Mb) with 56% sensitivity and 95% specificity. Based on this definition, 7 (13.2%) patients were TMB-high (TMB-H). The ORR differed between the TMB-low (TMB-L) and TMB-H (8.7% vs. 71.4%, P=0.001). The progression-free survival and overall survival (OS) for 53 patients were 1.93 (95% confidence interval [CI], 1.600-2.268) and 4.26 months (95% CI, 2.992-5.532). The median OS was longer in the TMB-H (20.8 months; 95% CI, 2.292-39.281) than in the TMB-L (3.31 months; 95% CI, 1.604-5.019; P=0.049). Conclusions: The TMB cutoff value for predicting treatment response in AGC patients who received PD-1 checkpoint inhibitor monotherapy as salvage treatment was 13.31 mt/Mb. When applying the programmed death ligand-1 status to TMB-H, patients who would benefit from PD-1 checkpoint inhibitors can be selected.

• Journal of Gastric Cancer
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• 제23권4호
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• pp.598-608
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• 2023

Purpose: Lymph node (LN) metastasis is a crucial factor in the prognosis of patients with gastric cancer (GC) and is known to occur more frequently in cases with an advanced T stage. This study aimed to analyze the survival data of patients with advanced LN metastasis in T1 GC. Materials and Methods: From January 2008 to June 2018, 677 patients with pathological stage II GC who underwent radical gastrectomy were divided into an early GC group (EG: T1N2 and T1N3a, n=103) and an advanced GC (AGC) group (AG: T2N1, T2N2, T3N0, T3N1, and T4aN0, n=574). Short- and long-term survival rates were compared between the 2 groups. Results: A total of 80.6% (n=83) of the patients in the EG group and 52.8% (n=303) in the AG group had stage IIA AGC. The extent of LN dissection, number of retrieved LNs, and short-term morbidity and mortality rates did not differ between the 2 groups. The 5-year relapse-free survival (RFS) of all patients was 87.8% and the overall survival was 84.0%. RFS was lower in the EG group than in the AG group (82.2% vs. 88.7%, P=0.047). This difference was more pronounced among patients with stage IIA (82.4% vs. 92.9%, P=0.003). Conclusions: T1 GC with multiple LN metastases seems to have a worse prognosis compared to tumors with higher T-stages at the same level. Adjuvant chemotherapy is highly recommended for these patients, and future staging systems may require upstaging T1N2-stage tumors.

• Journal of Gastric Cancer
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• 제3권4호
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• pp.195-200
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• 2003

Purpose: Advancement of computed tomography (CT) hardware and software has allowed thin section scanning and reconstruction of fascinating 2-dimentional (2D) and 3- dimentional (3D) images. Especially, the reconstruction of 3D images of gastrointestinal tract has been used in the detection and diagnosis of pre-malignant and malignant diseases. To compare the efficacy of CT gastrography with conventional upper gastrointenstinal series (UGIs) in gastric cancer patients. Materials and Methods: During Nov. 2002 and Mar. 2003, twenty-seven patients who had gastric cancer received both double contrast upper GI series and CT gastrography prior to radical surgery. Among these patients, nineteen had early gastric cancer (EGC) and 8 had advanced gastric cancer (AGC). Fifteen patients were male and 12 were female. The mean age was 54 yrs (range, $27\∼75$ yrs). The patients were placed on NPO and Stomach was distended with gas in fasting state prior to CT scanning. Double contrast upper GI series were performed as routine manual. CT scan was conducted in all patients using 8 or 16-channel multidetector CT in this study. The collimation and reconstruction for CT scanning were set at 2.5 mm and 1.25 mm, respectively. CT scanning was performed in the supine position. For image processing, CT gastrography, in which raysum and surface rendering images were constructed, virtual and 2D image in coronal and sagittal images were performed. The detectability of gastric cancer was assessed between UGIs and CT gastrography. Results: In AGCs, the detection rate of cancer using CT gastrography and virtual gastroscopy was higher than EGC cases. However, CT gastrography and virtual gastroscopy showed less favorable results than UGIs. Even though only a small number of cases had been studied, we might conclude that CT gastrography and virtual gastroscopy could replace UGIs in the detection of AGC cases. Conclusion: The detection rate used with CT gastrography and Virtual gastroscopy is not better than that of UGIs in early gastric cancer, however, in advanced gastric cancer cases, it is nearly equal to that of UGIs.

• Journal of Gastric Cancer
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• 제6권3호
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• pp.139-145
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• 2006

목적: 진행성 위암환자에게 여러 종류의 항암요법이 시행되고 있으나 심각한 부작용 발현 없이 예후증진을 이룰 수 있는 약제는 아직 개발되지 않고 있다. 이처럼 표준요법의 개발이 시급한 시점에서 TS-1이 한국인 위암환자에서 어떤 항암효과 및 안정성을 보이는지 알고자 하였다. 대상 및 방법: 진행성 위암으로 진단된 78명을 대상으로 TS-1 단독 또는 TS-1/CDDP 병용요법을 시행하였다. TS-1은 $80\;mg/m^{2}/day$을 단독요법의 경우 4주 복용 및 2주 휴약을, 병용요법인 경우엔 3주 복용 및 2주 휴약을 1 cycle로 하였다. CDDP은 $60\;mg/m^{2}$ 용량으로 제8일째에 정맥 주사하였다. 결과: 수술 전 요법군과 재발 및 비근치적 수술군에서의 종양 반응률은 각각 87.5%, 및 32.4%였고, 단독요법군 28.6%, 병용요법군 48.4%였다. 재발 및 비근치적 수술군의 경우 종양의 반응률에 따른 생존율 차이는 의미 있는 차이(P=0.0016)를 보였고, 1년 생존율은 단독요법 56.1%, 병용요법 58.5%였으며 두 군간의 차이는 의미가 없었다. 전체 환자에서 치료관련 부작용 발현빈도(grade 3 이상)는 단독 및 병용요법의 경우 14.3% 및 36.8%였다. 결론: 한국인 진행성 위암환자를 대상으로 시행한 TS-1 단독 또는 CDDP와의 병용요법은 높지 않은 부작용 발현빈도와 높은 종양 반응률을 보였으며, 향후 용량 조절과 스케줄 조절을 통해 표준항암요법의 하나가 될 수 있는 가능성을 보여주었다.

• Journal of Gastric Cancer
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• 제17권4호
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• pp.374-383
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• 2017

Purpose: Bleeding is one of the most serious complications of advanced gastric cancer (AGC) and is associated with a poor prognosis. This study aimed to evaluate the clinical outcomes of endoscopic hemostasis for bleeding in patients with unresectable AGC. Materials and Methods: This study included 106 patients with bleeding associated with gastric cancer who had undergone endoscopic hemostasis between January 2010 and December 2013. Clinical characteristics, treatment outcomes, including rates of successful endoscopic hemostasis and rebleeding, risk factors for rebleeding, and overall survival (OS) were investigated. Results: Successful initial hemostasis was achieved in 83% of patients. Rebleeding occurred in 28.3% of patients within 30 days. The median OS after initial hemostasis was lower in patients with rebleeding than in those without rebleeding (2.7 and 3.9 months, respectively, P=0.02). There were no significant differences in disease status and rebleeding rates among patients with partial response or stable disease (n=4), progressive disease (n=64), and first diagnosis of disease (n=38). Univariate and multivariate analyses (P=0.038 and 0.034, respectively) revealed that transfusion of ${\geq}5$ units of RBCs was a significant risk factor for rebleeding. Conclusions: Despite favorable success rates of endoscopic hemostasis for bleeding associated with gastric cancer, the 30-day rebleeding rate was 28.3% and the median OS was significantly lower in patients with rebleeding than in those without rebleeding. Massive transfusion (${\geq}5$ units of RBCs) was the only significant risk factor for rebleeding. Patients with bleeding associated with AGC who have undergone massive transfusion should be observed closely following endoscopic hemostasis. Further research on approaches to reduce rebleeding rate and prevent death is needed.

• Journal of Gastric Cancer
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• 제1권2호
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• pp.83-91
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• 2001

Purpose: This study was to observe whether the apoptotic function of tumor-infiltrating lymphocytes (TIL) is induced in human gastric epithelial dysplasia and gastric adenocarcinoma according to the role of FasL expression. Materials and Methods: A total of 56 gastric epithelial dysplasia and gastric adenocarcinoma patients were enrolled in this study: 9 cases of gastric epithelial dysplasia, 18 cases of early gastric carcinomas (EGC) and 29 cases of advanced gastric carcinomas (AGC). Immunohistochemical staining was performed for FasL and CD45, and the terminal deoxynucleotidyl transferase mediated dUTP nick end labelling (TUNEL) method was used to detect cell death in tumor-infiltrating lymphocytes. Results: 1) Positive reactions of FasL to neoplastic cells were $88.9\%$ (8/9) in gastric epithelial dysplasia, $83.3\%$ (15/18) in EGC, and $75.9\%$ (22/29) in AGC. 2) Expression of TIL was decreased in the FasL positive region and was increased in the FasL negative region, and significant expression of TIL was observed in the AGC group (P=0.001). 3) Expression of apoptotic TIL was very similar to the FasL expression, and $100\%$ expression was observed in gastric epithelial dysplasia group. 4) Expression of apoptotic TIL was increased in the FasL positive region and decreased in the FasL negative region, and significant apoptotic expression was observed in the gastric epithelial dysplasia and EGC groups (P=0.0420, P=0.0263, respectively). Conclusion: These results suggest that FasL is a prevalent mediator of immune privilege in epithelial dysplasia and cancer of the stomach.