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Goyang, South Korea

Woo S.M.,Center for Liver Cancer | Joo J.,Biometric Research Branch | Lee W.J.,Center for Liver Cancer | Park S.-J.,Center for Liver Cancer | And 5 more authors.
Journal of Korean Medical Science | Year: 2013

Several studies have reported that ABO blood group, hepatitis B virus (HBV) and hepatitis C virus (HCV) infection contribute to the development of pancreatic cancer. The aim of this study was to evaluate the association between these factors and pancreatic cancer in the Korean population. We retrospectively recruited 753 patients with pancreatic cancer and 3,012 healthy controls, matched 4 to 1 with cancer patients for age and sex, between 2001 and 2011, at the National Cancer Center, Korea. A multivariate logistic regression analysis was employed to estimate adjusted odds ratios (AORs). The AOR for pancreatic cancer in subjects with non-O blood types (A, AB, and B), compared to blood type O, was 1.29 (95% CI, 1.05-1.58; P = 0.01). Seropositivity for hepatitis B virus surface antigen was not significantly related to pancreatic cancer, either in univariate (odds ratio 1.03; 95% CI, 0.69-1.53; P = 0.91) or multivariate analysis (AOR, 1.02; 95% CI, 0.67-1.56; P = 0.93). The AOR for pancreatic cancer in subjects displaying seropositivity for anti-HCV was 2.30 (95% CI, 1.30-4.08; P < 0.01). Our results suggest that the non-O blood types and anti-HCV seropositivity, but not HBV infection, may increase the risk of developing pancreatic cancer in Korea, where HBV is endemic. © 2013 The Korean Academy of Medical Sciences. Source

Lee Y.,Research Institute and Hospital | Lee Y.,Yonsei University | Lee G.K.,Research Institute and Hospital | Zhang W.,Research Institute and Hospital | And 6 more authors.
Cancer | Year: 2014

BACKGROUND Epidermal growth factor receptor (EGFR) T790M mutation drives acquired drug resistance to EGFR tyrosine kinase inhibitors (EGFR-TKIs) in patients with EGFR-mutant lung cancer. However, it was reported that this mutation may exist before drug exposure. The objective of the current study was to evaluate whether the clinical outcomes are affected by the percentage of preexisting T790M mutations within a tumor. METHODS Pretreatment tissues were collected from 124 patients with advanced non-small cell lung cancer with sensitizing EGFR mutations that were detected by direct sequencing. Genotyping for EGFR T790M mutation was further performed using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Patients who were positive for the T790M mutation were divided to 2 subgroups according to T790M mutant signal frequency. RESULTS The T790M mutation was found in 31 patients (25.0%). The T790M mutation frequency at which the risk of disease progression after therapy with EGFR-TKIs begins to increase was estimated to be 3.2%. The patients with T790M-positive tumors had a shorter time to disease progression after treatment with EGFR-TKIs (median, 6.3 months vs 11.5 months; P < .001) and overall survival (median, 16.1 months vs 26.5 months; P = .065) compared with those with T790M-negative tumors. Among the T790M-positive patients, the patients with high T790M frequency (9 patients) were found to have a shorter time to disease progression (median, 2.4 months vs 6.7 months; P = .009) and overall survival (median, 9.1 months vs 18.7 months; P = .018) compared with those with low T790M frequency (22 patients). CONCLUSIONS A preexisting EGFR T790M mutation was noted in 25% of patients with EGFR-mutant lung cancer. Patients with a high T790M mutation frequency had worse clinical outcomes to EGFR-TKIs than patients with a low T790M mutation frequency. © 2014 American Cancer Society. Source

Kim H.S.,Anyang University, China | Kim H.J.,Korea University | Kim S.Y.,Kyung Hee University | Kim T.Y.,Seoul National University | And 5 more authors.
Annals of Oncology | Year: 2013

Background: Many patients with refractory or relapsed gastric cancer after first-line chemotherapy have received salvage chemotherapy in routine clinical practice. However, there was no evidence to support this treatment until recent phase III trials demonstrated substantial prolongation of overall survival. Therefore, we conducted a meta-analysis of these trials and investigated whether second-line chemotherapy was more effective than best supportive care. Patients and methods: We searched the Cochrane Central Register of Controlled Trials (CENTRAL, Issue 1, 2013), MEDLINE (1950 to March week 4, 2013) and EMBASE (1980-2013, week 13). In addition, we searched all abstracts and virtual meeting presentations from the American Society of Clinical Oncology (ASCO) conferences held between 2004 and 2013. Results: The search process yielded 578 studies, two of which were randomized phase III trials that compared chemotherapy with supportive care. From the abstracts and virtual meeting presentations of ASCO held between 2004 and 2013, 127 abstracts were identified that evaluated second-line chemotherapy; only one relevant abstract was included in the meta-analysis. A total of 410 patients were eligible for analysis, of whom 150 received docetaxel chemotherapy, and 81 received irinotecan chemotherapy. A significant reduction in the risk of death [HR = 0.64, 95% confidence interval (CI) 0.52-0.79, P 0.0001] was observed with salvage chemotherapy.When the analysis was restricted to irinotecan ordocetaxel, there was still significant reduction in the risk of death with each chemotherapeutic agent. The HR was 0.55 (95% CI 0.40-0.77, P = 0.0004) for irinotecan and 0.71 (95% CI 0.56-0.90, P = 0.004) for docetaxel. Conclusion: This meta-analysis demonstrated evidence to support second-line chemotherapy in advanced gastric cancer. © The Author 2013. Published by Oxford University Press on behalf of the European Society for Medical Oncology All rights reserved. Source

Kang Y.-K.,University of Ulsan | Ryu M.-H.,University of Ulsan | Yoo C.,University of Ulsan | Ryoo B.-Y.,University of Ulsan | And 6 more authors.
The Lancet Oncology | Year: 2013

Background: Few treatment options remain for patients with metastatic or unresectable gastrointestinal stromal tumours (GIST) after objective progression on approved tyrosine-kinase inhibitors. We aimed to assess efficacy of imatinib rechallenge in these patients. Methods: In our prospective, randomised, double-blind trial, we enrolled adults (≥18 years) who had previously benefited from first-line imatinib (initial response or stable disease for ≥6 months) but whose metastatic or unresectable GIST had progressed on at least imatinib and sunitinib. We randomly allocated participants in a 1:1 ratio, with a centralised computer-generated allocation procedure (random permuted blocks of two, four, and six) and stratified by previous treatment and Eastern Cooperative Oncology Group performance status, to receive best supportive care with imatinib 400 mg per day or matched placebo. Crossover to open-label imatinib was allowed after investigator-adjudicated disease progression. The primary endpoint was progression-free survival (PFS), as determined by a masked external radiological review. All analyses were done for all patients who received at least one dose of study drug. This study is registered with ClinicalTrials.gov, number NCT01151852. Findings: Between July 20, 2010, and Jan 17, 2013, we randomly allocated 41 patients to the imatinib group and 40 patients to the placebo group. After a median follow-up of 5·2 months (IQR 3·4-9·4), median PFS was 1·8 months (95% CI 1·7-3·6) with imatinib compared with 0·9 months (0·9-1·7) with placebo (hazard ratio for progression or death 0·46, 95% CI 0·27-0·78; p=0·005). 37 (93%) patients in the placebo group crossed over to open-label imatinib after progression. The most common grade 3 or worse adverse events were anaemia (12 [29%] of 41 patients in the imatinib group vs three [8%] of 40 in the placebo group), fatigue (four [10%] vs none), and hyperbilirubinaemia (three [7%] vs one [3%]). Interpretation: In patients with GIST that is refractory to treatment with all standard tyrosine-kinase inhibitors, the disease continues to harbour many clones that are sensitive to kinase inhibitors. Continued kinase suppression might slow, although not halt, disease progression. Funding: Novartis Oncology, Ludwig Center at Dana-Farber/Harvard. © 2013 Elsevier Ltd. Source

Lee Y.,Center for Lung Cancer | Lee Y.,Research Institute and Hospital | Yoon K.-A.,Research Institute and Hospital | Joo J.,Biometric Research Branch | And 6 more authors.
Carcinogenesis | Year: 2013

The prognostic significance of inherited genetic variants in advanced-stage non-small cell lung cancer (NSCLC) patients remains unknown. In this study, we genotyped 271 817 singlenucleotide polymorphisms in 348 advanced NSCLC patients who received chemotherapy and analyzed their association with prognosis by using Cox proportional hazard regression model adjusted for known prognostic factors. Top candidate singlenucleotide polymorphisms (SNPs) were selected using the bootstrap re-sampling procedure. Median age of patient population was 56 years. Proportions of female, never smokers and adenocarcinoma were 64.9, 67.5 and 80.4%, respectively. We identified 17 top candidate SNPs related to prognosis using cut-off minimum P value of<5.0× 10-5 in at least 70% of 1000 bootstrap samples. These SNPs were located in the genomic regions of the FAM154A, ANKS1A, DLST, THSD7B, NCOA2, CDH8, SLC35D2, NALCN and EGF genes. The most significant SNP, rs1571228 (9p22.1:FAM154A), was significantly associated with overall survival in dominant model [AG+GG to AA, hazard ratio (HR) of death (95% CI)= 0.53 (0.42-0.67); P= 2.025× 10-7]. The SNP at 4q25:EGF, rs11098063, for which some genetic variations was previously reported to be associated with prognosis, also showed significant association with overall survival in additive model [CC versus CT versus TT, HR (95% CI)= 1.00 versus 0.61 (0.47-0.78) versus 0.39 (0.19-0.79); P= 9.582× 10-6]. Survival differences according to the genotype of these SNPs were independent of sex, smoking, histology and chemotherapy regimens. These results suggested the variants at multiple genetic loci might contribute to the risk of death in advanced NSCLC patients receiving chemotherapy. © The Author 2012. Published by Oxford University Press. All rights reserved. Source

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