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    The Comparison of FLOT and DCF Regimens as Perioperative Treatment for Gastric Cancer
    (Karger, 2024) Ucar, Gokhan; Sekmek, Serhat; Karahan, Irfan; Ergun, Yakup; Isak, ozlem Aydin; Tunc, Sezai; Dogan, Mutlu
    Introduction: Locoregional gastric cancer is a still serious problem and perioperative treatments may improve the success of management. Different regimens were examined. The present study purposed to compare the efficacy of fl uorouracil-leucovorin-oxaliplatin-docetaxel (FLOT) and docetaxel-cisplatin-fluorouracil (DCF) regimens. Methods: A retrospective multicenter study assessed the patients with loco regional gastric cancer. There are 240 patients (137 DCF, 103 FLOT). Survival rates were compared. Results: Demographic features were similar between the two groups, but the time period was different. The FLOT group had 7.8% pathological complete response, while the DCF group did not. Disease-free survival was longer in the FLOT than in the DCF group (median not reached - 13.94 months, respectively). Median overall survival was similar (30.9 vs. 37.8 months), but median follow-up affected the analysis. Survival for 36 months was 63% for the FLOT group and 40% for the DCF group (log-rank; p = 0.015). Conclusion: FLOT regimen was superior to DCF regimen for response and survival rates. DCF is a historical approach. Long-term follow-up period is needed for FLOT treatment. (c) 2024 S. Karger AG, Basel
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    KRAS codon 12 and 13 mutations may guide the selection of irinotecan or oxaliplatin in first-line treatment of metastatic colorectal cancer
    (Taylor & Francis As, 2019) Ergun, Yakup; Acikgoz, Yusuf; Bal, Oznur; Ucar, Gokhan; Dirikoc, Merve; Yildirim, Eda Caliskan; Akdeniz, Nadiye
    Background: In this study, we aimed to investigate the frequency, prognostic effect of codon, and amino acid-specific KRAS mutations in patients with metastatic colorectal cancer (mCRC) and their predictive effect on irinotecan and oxaliplatin during first-line treatment. Methods: The data of 304 mCRC patients were retrospectively evaluated between 2010 and 2018. Patients were categorized according to the most prominent codon and amino acid mutation and their prognostic features were analyzed. Results: In total, 274 patients were included in the study and 128 patients (47%) revealed KRAS mutation. Median follow-up time was 19.8 months (range; 1.6-96). The median overall survival rates for patients with codons 12 and 13 mutations were 25.4 and 22.2 months, respectively (p = 0.4). Moreover, the median overall survival for the codon 12 mutant patients who received irinotecan-based chemotherapy in the first-line treatment was 42.7 months, whereas for the codon 13 mutant and KRAS wild-type patients, it was 18.3 and 23.9 months, respectively (codon 12 vs. codon 13; HR: 0.31, p = 0.03, codon 12 vs. wild-type; HR: 0.45, p = 0.03). Conclusion: The significant survival advantage was observed in patients with codon 12 mutations who received irinotecan-based chemotherapy as a first-line treatment.
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    Predictive and prognostic effect of ABO blood group on immune checkpoint inhibitors
    (Ios Press, 2022) Ergun, Yakup; Esen, Selin Akturk; Bardakci, Murat; Ucar, Gokhan; Kalkan, Ziya; Urakci, Zuhat; Seyran, Erdogan
    BACKGROUND: The relationship of the ABO blood group system with the immune response is known, but its relationship with immune checkpoint inhibitors (ICIs) has not been clearly investigated until now. OBJECTIVE: In this study, the relationship between different blood groups and nivolumab treatment response in patients with advanced malignant melanoma was investigated. METHODS: The data of patients who used nivolumab for advanced malignant melanoma between April 2018 and April 2021 were retrospectively reviewed. RESULTS: A total of 73 patients were included in the study. In the progression-free survival (PFS) analysis according to blood groups, it was 3.9 months, 16.1 months, 20.0 months and 3.0 months for A, B, AB and O, respectively ( p = 0.1). Overall survival (OS) analysis according to blood groups was 5.1 months, 25.0 months, 20.0 months and 9.3 months for A, B, AB and O, respectively (p = 0.1). The B antigen group (B or AB) had significantly longer PFS and OS than the non-B antigen group (A or O) (16.1 vs. 3.5 months for PFS, respectively, p = 0.03; 20.0 vs. 7.4 months for OS, respectively, p = 0.02). CONCLUSIONS: The presence of B antigen provides a significant advantage in terms of survival in patients using ICIs for advanced melanoma.