Seung Chul Heo

Seoul National University, Sŏul, Seoul, South Korea

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Publications (41)88.3 Total impact

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    ABSTRACT: Purpose: The aim of this study was to evaluate the clinical value of whole body 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) in the patient with a recurrence of a previously treated colorectal malignancy. Materials and methods: Fifty-eight cases were scanned using PET at the PET Center of Seoul National University Hospital between May 1995 and Aug 2002. All the patients had had a previous operation for a colorectal malignancy. The PET scans were performed for the following reasons: - investigation of a recurrence (n=12), investigation of the operability (n=38) and clinical follow up (n=8). In these 58 cases, 47 of the CT scans and 55 of the CEA (Carcinoembryonic antigen) were checked prior to the FDG- PET. The accuracy, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of the PET scans were calculated, and compared with those of conventional CT scan and CEA, which were also compared with the previous reported data. Eight cases, whose managements were influenced by the PET findings, were analyzed. Results: Recurrences, or metastases, of colorectal cancer developed in 51 cases, with 49 of these being detected by the PET. The accuracy, sensitivity and specificity of the PET were 96.6 (56/58), 96.1 (49/51) and 100% (7/7), respectively. The PPV and NPV of the PET were 100 (49/49) and 77.8% (7/9), respectively. The accuracy and sensitivity of the PET were higher than those of the CT (85.1 and 88.1%), with the differences being statistically significant (p-value 0.001 and 0.003, respectively). Conclusion: It is concluded that a FDG-PET scan is a more accurate and sensitive diagnostic tool than a CT scan for the detection of a recurrence or metastasis in a colorectal malignancy. In addition, a FDG-PET may alter the management of patients with recurrent colorectal cancer. Therefore, it is recommended that a PET should be considered when a tumor recurrence is suspected during conventional follow up.
    Preview · Article · Dec 2015 · Cancer Research and Treatment
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    ABSTRACT: There has been no comparative study of the long-term oncological outcomes of appendiceal cancer and colon cancer. We hypothesized that the oncological outcome is worse in appendiceal cancer because perforation is more frequent than in colon cancer.
    No preview · Article · Dec 2015
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    ABSTRACT: The implementation of the Korean diagnosis-related groups (DRG) payment system has been recently introduced in selected several diseases including appendectomy in Korea. Here, we report the early outcomes with regard to clinical aspects and medical costs of the Korean DRG system for appendectomies in Seoul Metropolitan Government - Seoul National University Boramae Medical Center throughout comparing before and after introduction of DRG system. The DRG system was applied since January 2013 at our institute. After the DRG system, we strategically designed and applied our algorithm for the treatment of probable appendicitis. We reviewed the patients who were treated with a procedure of appendectomy for probable appendicitis between July 2012 and June 2013, divided two groups based on before and after the application of DRG system, and compared clinical outcomes and medical costs. Total 416 patients were included (204 patients vs. 212 patients in the group before vs. after DRG). Shorter hospital stays (2.98 ± 1.77 days vs. 3.82 ± 1.84 days, P < 0.001) were found in the group after DRG. Otherwise, there were no significant differences in the perioperative outcomes and medical costs including costs for first hospitalization and operation, costs for follow-up after discharge, frequency of visits of out-patient's clinic or Emergency Department or rehospitalization. In the Korean DRG system for appendectomy, there were no significant differences in perioperative outcomes and medical costs, except shorter hospital stay. Further studies should be continued to evaluate the current Korean DRG system for appendectomy and further modifications and supplementations are needed in the future.
    Full-text · Article · Mar 2015 · Annals of Surgical Treatment and Research
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    ABSTRACT: Background: The survival paradox between stage IIB/C (T4N0) and stage IIIA (T1-2N1) colon cancer remains in the 7th edition of the American Joint Committee on Cancer staging system. This multicenter study aimed to compare the oncologic outcomes of T4N0 and T1-2N1 colon cancers and to investigate the presumptive prognostic factors that might influence the survival paradox. Methods: Patients who underwent curative surgery for pT4N0 (n = 224) and pT1-2N1 (n = 135) primary colon cancer between January 1999 and December 2010 at five tertiary referral cancer centers were included for analysis. The clinicopathologic, treatment-related factors, and oncologic outcomes in terms of the 5-year overall survival (5-OS) and 5-year disease-free survival (5-DFS) were compared. Results: The T4N0 group had significantly worse 5-OS and 5-DFS rates than the T1-2N1 group (5-OS: 84.0 vs. 92.3 %, p = 0.012; 5-DFS: 73.6 vs. 88.0 %, p = 0.001). T4N0 cancers more frequently showed elevated preoperative carcinoembryonic antigen, lower grade of differentiation, larger tumor size, and higher proportions of perineural invasion, microsatellite instability, obstruction, and perforation than T1-2N1 cancers. Peritoneal seeding and liver metastasis were the predominant recurrence pattern in the T4N0 and T1-2N1 groups, respectively (p = 0.042). The T4N0 group showed inferior survival to the T1-2N1 group in postoperative adjuvant chemotherapy (5-OS: 87.1 vs. 93.2 %, p = 0.045; 5-DFS: 76.1 vs. 89.0 %, p = 0.001). Conclusions: T4N0 colon cancer had significantly worse oncologic outcomes than T1-2N1 cancer regardless of adjuvant chemotherapy. The survival paradox may result from the biologic aggressiveness of T4N0 colon carcinomas.
    No preview · Article · Aug 2014 · Annals of Surgical Oncology
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    ABSTRACT: Background This prospective study was performed to investigate whether postoperative ileus (POI) or early postoperative small bowel obstruction (EPSBO) affects the development of adhesive small bowel obstruction (SBO) in patients undergoing colectomy. Methods We prospectively enrolled 1,002 patients who underwent open colectomy by a single surgeon. POI was defined as the absence of bowel function for more than 5 days or as a delay in oral intake beyond 7 days postoperatively. EPSBO was defined as the clinical and radiologic identification of SBO after resuming oral intake between postoperative days 7 and 30. Adhesive SBO was defined as SBO developing after 30 days because of intraperitoneal adhesion. The associations between POI, EPSBO, patient- and surgery-related variables, and the development of adhesive SBO were analyzed. Results A total of 85 (8.5 %) patients developed POI, and 42 patients (4.2 %) developed EPSBO, with seven patients experiencing both POI and EPSBO. During the follow-up period (median 51 months), 70 patients (7.0 %) developed adhesive SBO, six (8.6 %) of whom needed laparotomy. The occurrence of adhesive SBO was significantly higher in patients with EPSBO than in those without EPSBO (26.5 vs. 7.5 % at 5 years, P
    No preview · Article · Aug 2014 · World Journal of Surgery
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    Seung Chul Heo

    Preview · Article · Jun 2014 · Annals of Coloproctology
  • Hye Seong Ahn · In Sil Choi · Junghan Song · Seung Chul Heo · J.-E. Kim

    No preview · Article · Apr 2014 · Cancer Research

  • No preview · Article · Mar 2014 · European Journal of Cancer
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    ABSTRACT: Carcinoembryonic antigen (CEA) is an important prognostic marker in colorectal cancer (CRC). However, in some stages, it does not work. We performed this study to find a way in which preoperative CEA could be used as a constant prognostic marker in harmony with the TNM staging system. Preoperative CEA levels and recurrences in CRC were surveyed. The distribution of CEA levels and the recurrences in each TNM stage of CRC were analyzed. An optimal cutoff value for each TNM stage was calculated and tested for validity as a prognostic marker within the TNM staging system. The conventional cutoff value of CEA (5 ng/mL) was an independent prognostic factor on the whole. However, when evaluated in subgroups, it was not a prognostic factor in stage I or stage III of N2. A subgroup analysis according to TNM stage revealed different CEA distributions and recurrence rates corresponding to different CEA ranges. The mean CEA levels were higher in advanced stages. In addition, the recurrence rates of corresponding CEA ranges were higher in advanced stages. Optimal cutoff values from the receiver operating characteristic curves were 7.4, 5.5, and 4.5 ng/mL for TNM stage I, II, and III, respectively. Those for N0, N1, and N2 stages were 5.5, 4.8, and 3.5 ng/mL, respectively. The 5-year disease-free survivals were significantly different according to these cutoff values for each TNM and N stage. The multivariate analysis confirmed the new cutoff values to be more efficient in discriminating the prognosis in the subgroups of the TNM stages. Individualized cutoff values of the preoperative CEA level are a more practical prognostic marker following and in harmony with the TNM staging system.
    Full-text · Article · Jun 2013 · Annals of Coloproctology
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    ABSTRACT: : More than half of all rectal cancers are T3 lesions, but they are classified as a single-stage category. : The aim of this study was to validate prognostic significance of mesorectal extension depth in T3 rectal cancer. : This study is a retrospective analysis of oncologic outcomes of patients with T3 rectal cancer grouped by mesorectal extension depth (T3a, <1 mm; T3b, 1-5 mm; T3c, 5-15 mm; T3d, >15 mm). : This study was conducted at a tertiary referral cancer hospital. : From 2003 to 2009, 291 patients who underwent a curative surgery were included. : Oncologic outcomes in terms of disease-free survival were analyzed. : The 5-year disease-free survival rate according to T3 subclassification was 86.5% for T3a, 74.2% for T3b, 58.3% for T3c, and 29.0% for T3d. It was significantly higher in T3a,b tumors than that in T3c,d tumors (77.6% vs 55.2%, p < 0.001). On univariate and multivariate analysis, prognostic factors affecting recurrence were preoperative CEA level ≥5ng/mL (HR 2.617, 95% CI 1.620-4.226), lymph node metastasis (HR 3.347, 95% CI 1.834-6.566), and mesorectal extension depth >5 mm (HR 1.661, 95% CI 1.013-2.725). In subgroup analysis, independent prognostic factors were preoperative CEA level and mesorectal extension depth >5 mm for 200 patients with ypT3 rectal cancer and preoperative CEA level and lymph node metastasis for 91 patients with pT3 rectal cancer. : This study lacks quality of surgery plane evaluation because of its retrospective nature. Moreover, pathologic examination was not done with a whole-mount section. : Depth of mesorectal extension >5 mm is a significant prognostic factor in patients with T3 rectal cancer. Depth of mesorectal extension especially may be more important than the nodal status in predicting the oncologic outcome for patients who had received preoperative chemoradiotherapy.
    No preview · Article · Dec 2012 · Diseases of the Colon & Rectum
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    Seung Chul Heo

    Preview · Article · Dec 2012 · Journal of the Korean Society of Coloproctology
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    ABSTRACT: Backgrounds/Aims We aimed to to evaluate the feasibility of laparoscopic common bile duct exploration (LCBDE) in patients with previous upper abdominal surgery. Methods Retrospective analysis was performed on data from the attempted laparoscopic common bile duct exploration in 44 patients. Among them, 5 patients with previous lower abdominal operation were excluded. 39 patients were divided into two groups according to presence of previous upper abdominal operation; Group A: patients without history of abdominal operation. (n=27), Group B: patients with history of upper abdominal operation. Both groups (n=12) were compared to each other, with respect to clinical characteristics, operation time, postoperative hospital stay, open conversion rate, postoperative complication, duct clearance and mortality. Results All of the 39 patients received laparoscopic common bile duct exploration and choledochotomy with T-tube drainage (n=38 [97.4%]) or with primary closure (n=1). These two groups were not statistically different in gender, mean age and presence of co-morbidity, mean operation time (164.5±63.1 min in group A and 134.8±45.2 min in group B, p=0.18) and postoperative hospital stay (12.6±5.7 days in group A and 9.8±2.9 days in group B, p=0.158). Duct clearance and complication rates were comparable (p>0.05). 4 cases were converted to open in group A and 1 case in group B respectively. In group A (4 of 27 (14.8%) and 1 of 12 (8.3%) in group B, p=0.312) Trocar or Veress needle related complication did not occur in either group. Conclusions LCBDE appears to be a safe and effective treatment even in the patients with previous upper abdominal operation if performed by experienced laparoscopic surgeon, and it can be the best alternative to failed endoscopic retrograde cholangiopancreatography for difficult cholelithiasis.
    Preview · Article · Nov 2012
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    ABSTRACT: This study was conducted to evaluate the initial experience of 24 cases of laparoscopic liver resection by a single surgeon to determine its feasibility and report perioperative complications associated with this technique.
    Full-text · Article · Jan 2012
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    ABSTRACT: We designed this study to evaluate the efficacy of carcinoembryonic antigen in draining venous blood (vCEA) as a predictor of recurrence. Draining venous and supplying arterial bloods were collected separately during the operation of 82 colorectal cancer patients without distant metastasis from September 2004 to December 2006. Carcinoembryonic antigen was measured and assessed for the efficacy as a prognostic factor of recurrence using receiver operating characteristic (ROC) and Kaplan-Meier curves. vCEA is a statistically significant factor that predicts recurrence (P = 0.032) and the optimal cut-off value for vCEA from ROC curve is 8.0 ng/mL. The recurrence-free survival between patients with vCEA levels >8 ng/mL and ≤8 ng/mL significantly differed (P < 0.001). The significance of vCEA as a predictor of recurrence gets higher when limited to patients without lymph node metastasis. The proper cut-off value for vCEA is 4.0 ng/mL if confined to patients without lymph node metastasis. The recurrence-free survival between the patients of vCEA levels >4 ng/mL and ≤4 ng/mL significantly differed (P < 0.001). Multivariate analysis revealed vCEA is an independent prognostic factor in patients without lymph node metastasis. vCEA is an independent prognostic factor of recurrence in colorectal cancer patients especially in patients without lymph node metastases.
    Full-text · Article · Dec 2011
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    ABSTRACT: Parastomal hernia is a major complication of an intestinal stoma. This study was performed to compare the results of various operative methods to treat parastomal hernias. Results of surgical treatment for parastomal hernias (postoperative recurrence, complications and postoperative hospital stays) were surveyed in 39 patients over an 11-year period. The patients enrolled in this study underwent surgery by a single surgeon to exclude surgeon bias. Seventeen patients were male, and twenty-two patients were female. The mean age was 65.9 years (range, 36 to 86 years). The stomas were 35 sigmoid-end-colostomies (90%), 2 loop-colostomies (5%), and 2 double-barrel-colostomies. Over half of the hernias developed within two years after initial formation. Stoma relocation was performed in 8 patients, suture repair in 14 patients and mesh repair in 17 patients. Seven patients had recurrence of the hernia, and ten patients suffered from complications. Postoperative complications and recurrence were more frequent in stoma relocation than in suture repair and mesh repair. Emergency operations were performed in four patients (10.3%) with higher incidence of complications but not with increased risk of recurrence. Excluding emergency operations, complications of relocations were not higher than those of mesh repairs. Postoperative hospital stays were shortest in mesh repair patients. In this study, mesh repair showed low recurrence and a low complication rate with shorter hospital stay than relocation methods, though these differences were not statistically significant. Further studies, including randomized trials, are necessary if more reliable data on the surgical treatment of parastomal hernias are to be obtained.
    Full-text · Article · Aug 2011 · Journal of the Korean Society of Coloproctology
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    ABSTRACT: The prognostic significance of apical-node metastasis around the inferior mesenteric artery (IMA) remains unclear. We investigated the oncological relevance of apical-node metastasis detected after high ligation of the IMA in stage III sigmoid colon or rectal cancer. Between May 2003 and December 2007, 229 consecutive patients with stage III sigmoid colon or rectal cancer, who had undergone curative resection with high ligation, were analyzed. Cox proportional regression model was used to identify the prognostic factors for disease-free survival. Thirty-one patients (13.5%) had apical-node metastases: 0% with T0-1, 3.8% with T2, 11.5% with T3, and 29.3% with T4 disease (p = 0.017). Additionally, the factors related to apical-node metastasis were tumor size, number of metastatic lymph nodes, lymph-node ratio, and N-stage. Multivariate analysis showed that the lymph-node ratio (odds ratio (OR) = 40.53, 95% confidence interval (CI) = 8.41-195.22, p < 0.001) was an independent prognostic factor for disease-free survival but that apical-node metastasis was not a factor that predicted a poor outcome (OR = 1.53, 95% CI = 0.81-2.91, p = 0.192). Apical-node metastasis was not a prognostic factor for disease-free survival on multivariate analysis of the subgroups based on tumor location (sigmoid colon cancer: OR = 1.42, 95% CI = 0.42-1.82, p = 0.577; rectal cancer: OR = 1.82, 95% CI = 0.82-4.06, p = 0.141). This study suggests that apical-node metastasis is not a poor prognostic factor for stage III sigmoid colon or rectal cancer after high ligation.
    No preview · Article · Jul 2011 · International Journal of Colorectal Disease
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    ABSTRACT: This study evaluated the notion that preoperative anal incontinence might be a potent predictive factor for anal incontinence (AI) after restorative proctectomy in rectal cancer patients. The principal objective of this study was to determine the risk factors for persistent anal incontinence following restorative proctectomy. This study was designed as a single-center, prospective cohort study of a single group of 93 patients who had AI before restorative proctectomy for rectal cancer. The study group was re-evaluated for the presence of AI 12 months after restorative proctectomy or ileostomy takedown. Incontinence severity was determined using the Fecal Incontinence Severity Index (FISI). Logistic regression analysis was performed to identify the clinicopathologic factors associated with persistent AI. Fifteen patients were excluded from analysis due to death within the 12 months after surgery (n = 7), no ileostomy repair (n = 5), loss to follow-up (n = 2), or previous treatment for anal incontinence (n = 1). At 12 months, 53 of 78 patients (67.9%) had persistent AI and 25 patients (32.1 %) had recovered. Multivariate analysis demonstrated that preoperative FISI scores higher than 30 (OR = 11.61, 95% CI 1.43-94.01, p = 0.022) and lower tumor location 5 cm or less from the anal verge (OR = 84.46, 95% CI 3.91-1822.85, p = 0.005) were independent factors for persistent AI. Anal incontinence may persist after restorative proctectomy in rectal cancer patients with high preoperative incontinence scores and lower tumor location. Therefore, this information should be provided when restorative proctectomy is offered for rectal cancer patients.
    No preview · Article · Apr 2011 · World Journal of Surgery
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    ABSTRACT: Although laparoscopic surgery may permit earlier recovery compared with open surgery, no published randomized controlled trial has investigated the benefit of a multimodal rehabilitation program after laparoscopic colonic resection. This study aimed to evaluate the efficacy of a rehabilitation program after laparoscopic colon surgery in the context of a randomized controlled trial. Between September 2007 and October 2009, 100 patients who had received laparoscopic colon surgery were selected for the study and randomly assigned on a 1:1 basis to a rehabilitation program group with early mobilization and diet (n = 46) or conventional care group (n = 54). The rehabilitation program group received early oral feeding, early ambulation, and regular laxative. The primary outcome was recovery time, measured with criteria of tolerable diet for 24 hours, safe ambulation, analgesic-free, and afebrile status without major complications. Secondary outcomes were postoperative hospital stay, complications, quality of life by Short Form 36, pain by visual analog scale, and readmission. This study was registered (ID number NCT00606944, http://register.clinicaltrials.gov). Recovery time was shorter in the rehabilitation program group than in the conventional care group (median (interquartile range), 4 (3-5) d vs 6 (5-7) d, respectively; P < .0001). There was no difference in postoperative hospital stay between the 2 groups (rehabilitation program group, 7 (6-8) d vs conventional care group, 8 (7-9) d; P = .065). There was no difference in complication rates between the rehabilitation program group and conventional care group (10.9% vs 20.4%, respectively; P = .136). Quality of life and pain were similar in both groups. There were no readmissions or mortality. A rehabilitation program with early mobilization and diet after laparoscopic colon surgery results in reduced recovery time without increased complications. These results suggest that a multimodal rehabilitation program may increase the short-term benefits after laparoscopic colon surgery.
    No preview · Article · Jan 2011 · Diseases of the Colon & Rectum
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    ABSTRACT: Dermatofibrosarcoma protuberans is a rare tumor that occurs in the dermis or subcutaneous tissue of the trunk or extremities in relatively young adults. There are few reports of Dermatofibrosarcoma protuberans associated with pregnancy. We experienced a 28-year-old pregnant female patient with an abdominal wall mass, which grew rapidly during pregnancy. Excisional biopsy was performed and the pathologic diagnosis was fibrosarcoma transformed from Dermatofibrosarcoma protuberans. Dermatofibrosarcoma protuberans showed a positive CD34 immunostaining while fibrosarcoma showed a negative CD34. There was no recurrence or metastasis with the follow up period of 2 years. We report here a rare case of Dermatofibrosarcoma protuberans aggravated during pregnancy with a review of the literature.
    Preview · Article · Dec 2010 · Journal of the Korean Surgical Society
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    ABSTRACT: Whereas extramammary Paget's disease commonly occurs in the apocrine gland rich skin areas, ectopic extramammary Paget's disease develops in the skin areas that are devoid of apocrine glands. We experienced the case of a 34 year-old female patient who had a skin lesion in the upper outer quadrant of the right breast for 5 years and that lesion was diagnosed as Paget's disease according to the punch biopsy. There was no other underlying malignancy, and so wide excision was performed. The final pathologic diagnosis was Paget's disease confined to the epidermis and the size of the tumor was 3.0×1.1 cm. Positive staining for cytokeratin 7, epithelial membrane antigen and negative staining for S-100 protein and HMB-45 was observed on the immunohistochemical tests. We report here on an extremely unusual case of ectopic extramammary Paget's disease of the breast skin, and we include a review of the relevant literature.
    Full-text · Article · Jun 2010 · Journal of Breast Cancer