Il Yong Chung

Seoul National University Bundang Hospital, Seoul, Seoul, South Korea

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Publications (6)8.26 Total impact

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    ABSTRACT: Large genomic rearrangements (LGRs) in the BRCA1/2 genes are frequently observed in breast cancer patients who are negative for BRCA1/2 small mutations. Here, we examined 221 familial breast cancer patients from 37 hospitals to estimate the contribution of LGRs, in a nationwide context, to the development of breast cancer.
    BMC Cancer 09/2014; 14(1):645. · 3.33 Impact Factor
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    ABSTRACT: Triple-negative breast cancer (TNBC) accounts for 12-24 % of all breast cancers. Here, we studied 221 familial breast and/or ovarian cancer patients from 37 hospitals using a comprehensive approach to identify large genomic rearrangements (LGRs) as well as sequence variants, and investigated the association between BRCA1/2 mutational status and TNBC. We performed direct sequencing or mutation scanning followed by direct sequencing. Then, 143 BRCA1/2 mutation-negative patients were screened for LGRs. In this study, the prevalence of BRCA1/2 mutations was high (36.9 %). The prevalence of BRCA1 mutations was similar to that of BRCA2 mutations: 49.4 versus 50.6 %, respectively. TNBC was diagnosed in 35.2 % of BRCA1/2 mutation carriers and 57.1 % of BRCA1 mutation carriers. Conversely, two-thirds of TNBC patients carried BRCA1/2 mutation(s), and about half were BRCA1 mutation carriers. When stratified by the mutated gene, TNBC prevalence in BRCA1 mutation carriers was significantly lower when there was a family history of ovarian cancer. Our multinomial logistic regression model demonstrated that no single factor was sufficient, and at least two factors, such as a patient with family history of both breast cancer and ovarian cancer or a patient diagnosed at a relatively young age (<40 years) with a TNBC phenotype, are necessary to indicate BRCA1/2 genetic testing in this population. Our results suggest that TNBC is a strong predictor for the presence of a BRCA1 mutation in this population, but additional risk factors should also be evaluated to ascertain a 10 % or higher prior probability of BRCA1/2 mutation testing.
    Breast Cancer Res Treat. 01/2014;
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    ABSTRACT: BACKGROUND: The aims of this study were to evaluate the rate and risk factors of ipsilateral and contralateral central lymph node (CLN) metastases in patients with papillary thyroid cancer (PTC). METHODS: A total of 161 patients who underwent total thyroidectomy with prophylactic CLN dissection (CLND) to treat PTC were enrolled. RESULTS: Of 134 total cases excluding tumors located in the isthmus and bilateral lobes, 72 cases (53.7%) involved CLN metastases. Tumor size, age, and sex were found to be predictive of ipsilateral CLN metastasis and the rate of ipsilateral CLN metastasis in tumors > 1 cm was 59.6%. Contralateral CLN metastases were more prevalent only in tumors that already had ipsilateral CLN metastases (27.3%, p = .002). CONCLUSIONS: It is suggested that risk factors of ipsilateral and contralateral CLN metastases should be considered while planning the extent of CLND in patients with clinically node-negative and unilateral PTC upon preoperative ultrasonography. © 2012 Wiley Periodicals, Inc. Head Neck, 2012.
    Head & Neck 06/2012; · 2.83 Impact Factor
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    ABSTRACT: Although laparoscopic appendectomies (LAs) are performed universally, a controversy still exists whether the LA is an appropriate surgical approach to complicated appendicitis (CA). We retrospectively evaluated the outcomes of laparoscopic versus open appendectomies for CA. We retrospectively analyzed 60 consecutive patients who were diagnosed as having CA from July 2009 to January 2011. Outcomes such as operative time, time to soft diet, length of hospital stay, and postoperative complications were analyzed. There were no statistically significant differences in operative time between the LA and the open appendectomy (OA) groups. Return to soft diet was faster in the LA group (2.1 ± 1.2 vs. 3.5 ± 1.5 days; P = 0.001). Length of hospital stay was shorter for the LA group (4.4 ± 2.3 vs. 5.8 ± 2.9 days; P = 0.045). The overall complication rates showed no statistically significant difference between the two groups. In cases involving a periappendiceal abscess, the LA had a significantly higher incidence of intra-abdominal abscess (IAA) and postoperative ileus (PI; P = 0.028). The LA showed good results in terms of the time to soft diet, the length of hospital stay, and surgical site infection (SSI) whereas the overall complication rates were similar for the two groups. However, the LA was associated with significantly higher incidence of IAA and PI for the cases with a periappendiceal abscess. Therefore, when using a LA, the surgeon must take great care to minimize the incidence of IAA and PI if a periappendiceal abscess is present.
    Journal of the Korean Society of Coloproctology 12/2011; 27(6):293-7.
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    ABSTRACT: Primary systemic therapy (PST) downstages up to 40% of initial documented axillary lymph node (ALN) metastases in breast cancer. The current surgical treatment after PST consists of breast tumor resection and axillary lymph node dissection (ALND). This strategy, however, does not eliminate unnecessary ALND in patients with complete remission of axillary metastases. The aim of this study was to examine the accuracy of sentinel lymph node biopsy (SLNB) after PST among patients with documented ALN metastasis at presentation and to identify the rate of pathologic complete-remission (CR) with ALN after PST. We analyzed 66 patients with ALN metastasis that was pathologically proven preoperatively who underwent SLNB and concomitant ALND after PST. Axillary ultrasound (AUS) was used to evaluate the clinical response of initially documented ALN metastasis after PST. Intraoperative lymphatic mapping was performed using blue dye with or without radioisotope. After PST, 34.8% of patients had clinical CR of ALN on AUS and 28.8% patients had pathologic CR of ALN. The overall success rate of SLNB after PST was 87.9%, and the sentinel lymph node identification rate in patients with clinical CR was 95.7%. In patients with successful lymphatic mapping, 70.7% of patients had residual axillary metastases. The overall accuracy and false-negative rate were 87.9% and 17.1% in all patients: 95.5% and 10.0% in patients with clinical CR of ALN, and 83.3% and 19.4% in patients with residual axillary disease after PST. Our findings suggest that SLNB may be feasible in patients with initial documented ALN metastasis who have clinical CR for metastatic ALN after PST. Further investigation in a prospective setting should be performed to confirm our results.
    Journal of breast cancer. 06/2011; 14(2):147-52.
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    ABSTRACT: The worldwide use of complementary and alternative medicine (CAM) among cancer patients has increased, with breast cancer patients being more likely to use CAM compared with any other cancer patients. However, few surveys have systematically described CAM use among Korean breast cancer patients. This study investigated the use of CAM among patients who were diagnosed with breast cancer, along with the relevant demographic and clinical factors related to CAM use. We also compared the difference in quality of life between CAM users and nonusers. A total of 661 patients were invited to participate in this study during routine clinic visits, with 425 patients ultimately participating. Three hundred ninety-nine questionnaires were completed and used in the final analysis. Quality of life was evaluated based on the Korean versions of the EORTC QLQ-C30 and EORTC QLQ-BR23. Previous or current CAM usage was reported by 229 patients (57.4%). Independent factors related to CAM use were marital status, cancer stage, and coexisting illness. The common types of CAM use included exercise therapy (43.2%) and ingestion of vitamins and minerals (41.9%). The reasons for CAM use were to boost the immune system (53.2%), promote health (46.8%) and prevent recurrence (37.7%). Large proportions (70.4%) of CAM users did not discuss their CAM use with their physicians. Only a small number of CAM users (2.5%) answered that they were unsatisfied with their CAM use, with most CAM users reporting that they would continue their CAM use. Quality of life was not significantly different between CAM users and nonusers. A significant number of patients with breast cancer have used CAM, and health care providers should be aware of the variety of CAM methods and their patients' CAM uses for the proper management of breast cancer.
    Supportive Care in Cancer 01/2011; 20(3):461-73. · 2.09 Impact Factor