Soo Sang Sohn

Keimyung University, Sŏul, Seoul, South Korea

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Publications (11)18.45 Total impact

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    ABSTRACT: This study assessed whether preoperative maximum standardized uptake value (SUVmax) of metastatic lymph nodes (LNs) measured by F-fluoro-2-deoxy-D-glucose positron emission tomography/computed tomography (F-FDG PET/CT) could improve the prediction of prognosis in gastric cancer.One hundred fifty-one patients with gastric cancer and pathologically confirmed LN involvement who had undergone preoperative F-FDG PET/CT prior to curative surgical resection were retrospectively enrolled. To obtain nodal SUVmax, a transaxial image representing the highest F-FDG uptake was carefully selected, and a region of interest was manually drawn on the highest F-FDG accumulating LN. Conventional prognostic parameters and PET findings (primary tumor and nodal SUVmax) were analyzed for prediction of recurrence-free survival (RFS) and overall survival (OS). Furthermore, prognostic accuracy of survival models was assessed using c-statistics.Of the 151 patients, 38 (25%) experienced recurrence and 34 (23%) died during follow-up (median follow-up, 48 months; range, 5-74 months). Twenty-seven patients (18%) showed positive F-FDG nodal uptake (range, 2.0-22.6). In these 27 patients, a receiver-operating characteristic curve demonstrated a nodal SUVmax of 2.8 to be the optimal cutoff for predicting RFS and OS. The univariate and multivariate analyses showed that nodal SUVmax (hazard ratio [HR] = 2.71, P < 0.0001), pathologic N (pN) stage (HR = 2.58, P = 0.0058), and pathologic T (pT) stage (HR = 1.77, P = 0.0191) were independent prognostic factors for RFS. Also, nodal SUVmax (HR = 2.80, P < 0.0001) and pN stage (HR = 2.28, P = 0.0222) were independent prognostic factors for OS. A predictive survival model incorporating conventional risk factors (pT/pN stage) gave a c-statistic of 0.833 for RFS and 0.827 for OS, whereas a model combination of nodal SUVmax with pT/pN stage gave a c-statistic of 0.871 for RFS (P = 0.0355) and 0.877 for OS (P = 0.0313).Nodal SUVmax measured by preoperative F-FDG PET/CT is an independent prognostic factor for RFS and OS. Combining nodal SUVmax with pT/pN staging can improve survival prediction precision in patients with gastric cancer.
    Medicine 07/2015; 94(26):e1037. DOI:10.1097/MD.0000000000001037 · 4.87 Impact Factor
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    ABSTRACT: BackgroundM1 gastric cancer has a poor oncologic outcome with a median survival of less than 1 year despite aggressive chemotherapy. Recent trials include chemotherapy combined non-curative gastrectomy. This study evaluated the chemoresponse after non-curative gastrectomy in M1 gastric cancer and the survival benefit.Methods Between January 2000 and December 2010, 660 patients received chemotherapy for gastric cancer at the Department of Hemato-Oncology, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea. Data was collected retrospectively from the medical records. Patients who received preoperative or adjuvant chemotherapy, who underwent other surgeries like gastrojejunal bypass or exploratory laparotomy, who died within 3 months due to seriously advanced gastric cancer, who were lost to follow-up, or whose medical records were unsuitable for data collection were excluded. The remaining 101 patients had received chemotherapy only (CTx group, n¿=¿76) or chemotherapy after non-curative gastrectomy (NCG¿+¿CTx group, n¿=¿25). Clinicopathologic characteristics, chemoresponse, and overall survival were compared between the two groups.ResultsThere were no significant differences between the two groups in clinicopathologic characteristics including age, sex, body mass index (BMI), comorbidity, histologic differentiation, tumor location, clinical T stage, and initial site of distant metastasis. Chemoresponse was checked on two separate occasions from the initiation of chemotherapy: first chemotherapy regimen and until the third regimen change. The NCG¿+¿CTx group showed more favorable chemoresponse than the CTx group in both checks (60% and 72% vs. 18.4% and 23.7%). The NCG¿+¿CTx group showed longer overall survival than the CTx group (26 vs. 11 months).Conclusions Non-curative gastrectomy in M1 gastric cancer could improve chemoresponse and extend overall survival.
    World Journal of Surgical Oncology 01/2015; 13(1):13. DOI:10.1186/s12957-015-0447-3 · 1.20 Impact Factor
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    ABSTRACT: Gastrointestinal (GI) mucormycosis is a rare and life-threatening invasive fungal infection. GI mucormycosis occur in all parts of the alimentary tract, with the stomach being the most common site. Diabetes mellitus and other types of conditions associated with immunodeficiency, including hematologic malignancies, solid organ transplantation and glucocorticoid therapy, are risk factors for GI mucormycosis. There are few studies reporting cases of gastric mucormycosis in patients with liver cirrhosis, and even fewer reporting the successful treatment of invasive gastric mucormycosis in a patient with liver cirrhosis. This study presents a case of invasive gastric mucormycosis in a patient with liver cirrhosis, which was treated successfully by prompt diagnosis, metabolic support, surgical debridement of involved tissues and antifungal therapy.
    Experimental and therapeutic medicine 08/2014; 8(2):401-404. DOI:10.3892/etm.2014.1753 · 0.94 Impact Factor
  • Seung Hyoung Lee · In Gyu Kwon · Seung Wan Ryu · Soo Sang Sohn
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    ABSTRACT: Jejunogastric intussusception (JGI) is a rare condition and less than 200 cases have been published since its first description in 1914. In addition, JGI is potentially lethal complication of gastrectomy or gastrojejunostomy. We report the case of a 73-year-old man with a history of a Billroth II procedure who presented to the emergency department after 6 hours of epigastric pain and hematemesis. Endoscopy and computed tomography showed intussuscepted jejunum through a gastrojejunostomy that required emergency operation. At laparotomy a retrograde type II, JGI was confirmed and managed by resection of involved intestine. Postoperative recovery was uneventful. This case presents the rare complication of acute jejunogastric intussusception more than 25 years after a Billroth II procedure.
    International Journal of Clinical and Experimental Medicine 01/2014; 7(11):4498-502. · 1.42 Impact Factor
  • Seung Soo Lee · Seung Wan Ryu · In Ho Kim · Soo Sang Sohn
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    ABSTRACT: The aim of this study was to compare the quality of life after the early postoperative period and before reaching 5 years postoperatively between patients who underwent laparoscopy-assisted distal gastrectomy (Group A) and patients who underwent open distal subtotal gastrectomy (Group B). The Korean versions of the European Organization for Research and Treatment (EORTC) Quality of Life Questionnaire Core 30 (QLQ-C30) and a gastric cancer-specific module, the EORTC QLQ-STO22, were used to assess the quality of life of 80 patients who underwent laparoscopy-assisted distal gastrectomy or open distal subtotal gastrectomy for gastric cancer. The postoperative period ranged between 6 months and 5 years. The global health status/quality of life scores of Groups A and B were 56.0 ± 19.0 and 57.4 ± 18.2, respectively (p = 0.729). Group A experienced worse quality of life in role functioning (p = 0.026), cognitive functioning (p = 0.034), fatigue (p = 0.039), eating restrictions (p = 0.009), and anxiety (p = 0.033). Group A showed a trend to experience worse quality of life in physical functioning, emotional functioning, social functioning, insomnia, and body image, albeit without statistical significance. After the early postoperative period and before achieving long-term survival, patients who underwent laparoscopy-assisted distal gastrectomy appeared to experience lower quality of life compared to patients who underwent open distal subtotal gastrectomy. This finding may be associated with the patients' erroneously high expectations of laparoscopy-assisted distal gastrectomy.
    Gastric Cancer 11/2011; 15(3):299-304. DOI:10.1007/s10120-011-0113-6 · 4.83 Impact Factor
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    Seung Soo Lee · Seung Wan Ryu · In Ho Kim · Soo Sang Sohn
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    ABSTRACT: The natural course of untreated patients with signet ring cell carcinoma of the stomach remains poorly understood while assumptions have been made to distinguish it from other types of gastric cancer. A 74-year-old Korean woman was diagnosed with early gastric cancer with signet ring cell histology and refused surgery. A satellite lesion was identified 46 months after the initial diagnosis. The patient finally agreed to undergo distal subtotal gastrectomy 53 months following the initial diagnosis. Postoperative histological examination of both lesions confirmed signet ring cell carcinoma associated with submucosal invasion. There was no evidence of lymph node metastasis.
    Journal of Gastric Cancer 09/2011; 11(3):189-93. DOI:10.5230/jgc.2011.11.3.189
  • 06/2011; 7(1):72-78. DOI:10.14216/kjco.11012
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    Young Gil Son · Seung Wan Ryu · In Ho Kim · Soo Sang Sohn · Yu Na Kang
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    ABSTRACT: Lymph node metastasis is an important prognostic factor in patients with early gastric cancer. Therefore, we analyzed the predictive factors for lymph node metastasis in submucosal gastric cancer and explored the feasibility of minimally invasive surgery.
    Journal of the Korean Surgical Society 01/2009; 76(6). DOI:10.4174/jkss.2009.76.6.355 · 0.21 Impact Factor
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    ABSTRACT: The aim of this study was to determine the prognostic significance of the expression of p53 and retinoblastoma (Rb) gene products in cases of curatively resected gastric adenocarcinoma, by immunohistochemical analysis. Between January 1996 and December 2001, 736 curatively resected gastric cancer patients underwent immunohistochemical staining for p53 or Rb proteins (pRb), and we retrospectively analyzed the correlation of our results with the clinical outcomes of these cases. High levels of expression of p53 (>25% p53-positive cells) and Rb (>50% Rb-positive cells) proteins were detected in 40.1% and 43.7% of cases, respectively. Tubular type was found to frequently exhibit higher levels of p53 expression (high expression in 44.2%) than signet ring cell type (high expression in 26.0%) (p = 0.042). The incidence of vascular invasion was lower in the high pRb expressors (43.2%) than in the pRb low expressors (56.8%), but this was not a statistically significant discrepancy (p = 0.063). Preoperative CEA levels were found to be low in high pRb expressors: initial CEA level in the high pRb expressors was 2.31 +/- 3.30 ng/mL, and was 5.18 +/- 24.80 ng/mL in the low pRb expressors (p = 0.033). Tumor depth and node metastasis were both independent of the levels of expression of p53 and Rb proteins. The seven-year overall survival rate and relapse-free survival rates of patients were 87.2% and 75.7%, respectively. Multivariate Cox regression analysis indicated that tumor stage, tumor size, patient age and pRb expression were the significant prognostic factors with regard to overall survival, and tumor stage and age were both significant factors with regard to relapse-free survival. Immunohistochemical staining of retinoblastoma gene products was an independent prognostic factor for the prediction of overall survival in curatively resected gastric cancer patients.
    The Korean Journal of Internal Medicine 03/2005; 20(1):1-7. DOI:10.3904/kjim.2005.20.1.1
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    ABSTRACT: The purpose of this study was to investigate the prognostic significance of the expression of EGFR and C-erbB-2 gene products by immunohistochemical analysis for curatively resected gastric adenocarcinoma. Between January 1996 and December 2001, 739 patients with curatively resected gastric cancer patients underwent immunohistochemical staining for EGFR and C-erbB-2 proteins, and we retrospectively analyzed their correlation with the clinical outcome. The over expressions of EGFR and C-erbB-2 were 25.4% and 26.2%, respectively. The over expressions of EGFR was associated with the more poorly differentiated tumor (p=0.000) and with neuronal invasion (p=0.03). Over expression of C-erbB-2 was associated with less vascular invasion (p=0.001). Tumor depth or node metastasis was not related to the over expression of EGFR or C-erbB-2. The seven-year overall survival and relapse-free survival rates were 87.2% and 75.8%, respectively. Upon multivariate Cox regression analysis, the tumor stage, tumor size and patient age were important prognostic factors for overall survival, and tumor stage was the important factor for relapse-free survival. Over expressions of EGFR or c-erbB-2 were not significant prognostic factors. Immunohistochemical staining of EGFR and C-erbB-2 gene products were not independent prognostic factors for predicting the overall survival and the relapse-free survival in curatively resected gastric cancer.
    Cancer Research and Treatment 08/2004; 36(4):240-5. DOI:10.4143/crt.2004.36.4.240 · 2.98 Impact Factor
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    ABSTRACT: The expression of melanoma antigen gene (MAGE), coding for tumor antigens recognized by cytotoxic T cell, is highly specific to cancer cells, but their use in the detection of a few cancer cells by reverse transcription-polymerase chain reaction (RT-PCR) has been limited by the low frequency of expression of individual MAGE genes. In order to increase MAGE detection rate in RT-PCR assay, here, we designed multiple MAGEs recognizing primers (MMRPs) that can bind to the sequences of cDNA of MAGE-1, -2, -3, -4a, -4b, -5a, -5b and-6 (MAGE 1-6) together. The nested RT-PCR assay using MMRPs, MAGE 1-6 assay, detected MAGE messages of 1 to 5 SNU484 cells in a background of 10(7) SNU638 cells. MAGE detection rate of MAGE 1-6 assay in cancers was higher than that of nested RT-PCR that detects single MAGE gene expression. The expressions of MAGE genes was detected by MAGE 1-6 assay in 70.4% (19/27) of head and neck cancer tissues, 91.7% (11/12) of breast cancer tissues, 75% (9/12) of lung cancer tissues. However, they were not detected in 18 benign lesions and 20 normal head and neck tissues and 30 blood samples from healthy donor. In conclusions, MAGE 1-6 assay can detect any cancer cells that express at least one of eight MAGE subtype genes, and this method may be very useful for the diagnosis of MAGE-expressing cancers.
    Journal of Immunological Methods 09/2002; 266(1-2):79-86. DOI:10.1016/S0022-1759(02)00105-9 · 2.01 Impact Factor