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Öğe Association of obesity with breast cancer clinical and pathological factors: Analysis of Turkish National Breast Cancer Registry.(Amer Soc Clinical Oncology, 2015) Coskun, Ugur; Altundag, Kadri; Aliustaoglu, Mehmet; Uncu, Dogan; Ozkan, Metin; Cicin, Irfan; Ciltas, Aydin[Abstract Not Available]Öğe Breast cancer subtypes and the risk of distant relapse after breast conserving surgery or mastectomy: An Anatolian Society of Medical Oncology study.(Amer Soc Clinical Oncology, 2015) Kaplan, Muhammet Ali; Urakci, Zuhat; Uncu, Dogan; Dane, Faysal; Ozkan, Metin; Akman, Tulay; Harputluoglu, Hakan[Abstract Not Available]Öğe Characteristics of Turkish colorectal cancer patients and bevacizumab preference.(Amer Soc Clinical Oncology, 2017) Cicin, Irfan; Gumus, Mahmut; Uncu, Dogan; Ozkan, Metin; Kilickap, Saadettin; Elkiran, Tamer E.; Isikdogan, Abdurrahman[Abstract Not Available]Öğe Effect of body mass index in gastric cancer patients: Analysis of Turkish national gastric cancer registry(Amer Soc Clinical Oncology, 2015) Ciltas, Aydin; Karaca, Mustafa; Uncu, Dogan; Ozkan, Metin; Aliustaoglu, Mehmet; Tekin, Salim Basol; Cicin, Irfan[Abstract Not Available]Öğe Effectiveness and Safety of LMWH Treatment in Patients With Cancer Diagnosed With Non-High-Risk Venous Thromboembolism: Turkish Observational Study (TREBECA)(Sage Publications Inc, 2018) Ozaslan, Ersin; Ozkan, Metin; Cicin, Irfan; Benekli, Mustafa; Kocer, Murat; Uysal, Mukremin; Oksuzoglu, BernaWe compared the efficacy and safety of low-molecular-weight heparins (LMWHs) in patients with cancer who are at low risk of venous thromboembolism (VTE). Patients were treated by medical oncologists in Turkey at 15 sites, where they were enrolled and followed up for a period of 12 months. Due to the study design, there was no specific treatment protocol for LMWH. Primary end points were efficacy and the time to change in VTE status. Of the included 250 patients, 239 (95.6%), 176 (70.4%), 130 (52.0%), and 91 (36.4%) completed their day 15, month 3, month 6, and month 12 visits, respectively. Number of patients treated with enoxaparin, bemiparin, and tinzaparin were 133, 112, and 5, respectively. Anticoagulant therapy provoked thrombus resolution in 1.2% and 12.7% of patients using enoxaparin and bemiparin, respectively (P = .004). Thrombus resolution was observed in 81 more patients at month 3 visit. This ratio was 35 (40.2%) of 87 and 46 (54.1%) of 85 patients administered enoxaparin and bemiparin at the third visit, respectively (P = .038). Thrombus resolution was observed in 21 more patients during month 6 visit. This ratio was 5 (7.7%) of 65 and 15 (23.4%) of 64 patients administered enoxaparin and bemiparin at the fourth visit, respectively (P = .022). The LMWH was discontinued in only 2 patients due to gastrointestinal bleeding. This pioneering study shows bemiparin is more effective than enoxaparin in thrombosis resolution and has a similar tolerability profile.Öğe Effectiveness and safety of LMWH treatment in patients with cancer diagnosed with nonhigh-risk venous thromboembolism (VTE): Results of the Turkish observational study (TREBECA).(Amer Soc Clinical Oncology, 2017) Ozaslan, Ersin; Ozkan, Metin; Cicin, Irfan; Benekli, Mustafa; Kocer, Murat; Uysal, Mukremin; Oksuzoglu, Berna[Abstract Not Available]Öğe Efficacy of sorafenib in advanced differentiated and medullary thyroid cancer: experience in a Turkish population(Dove Medical Press Ltd, 2015) Benekli, Mustafa; Yalcin, Suayib; Ozkan, Metin; Elkiran, Emin Tamer; Sevinc, Alper; Cabuk, Devrim; Coskun, Hasan SenolBackground: Antivascular endothelial growth factor tyrosine kinase inhibitors have been used recently in the treatment of advanced differentiated thyroid cancer (DTC) and medullary thyroid cancer (MTC). Off-label sorafenib is used in Turkey with special permission by the Ministry of Health for this indication. Patients and methods: Patients with advanced DTC and MTC were retrospectively identified from the Turkish Ministry of Health database. Data on these patients were prospectively collected before permission is granted to use sorafenib. Results: Thirty patients with complete data were analyzed: 14 DTC (papillary number [n] = 10; follicular n=4) and 16 MTC. The median age of the patients was 57 years (range: 28-79 years), and there were 18 males and 12 females. All DTC patients were iodine refractory and had received a median three doses of radioactive iodine (range: 1-7 doses). Sorafenib was used for a median of 12 months (range: 1-49 months). The overall response rate was 20%, all partial responses, with no complete response. The overall response rate was 14% in DTC and 25% in MTC patients. The median progression-free survival (PFS) was 17.1 months (95% confidence interval [CI]: 7.3-26.8) and overall survival (OS) was not reached. The 2-year PFS and OS were 39% and 68%, respectively. DTC and MTC patients had similar survival outcomes: median PFS of 21.3 months (95% CI: 5.8-36.7) versus 14.5 months (95% CI: 3.7-25.2), respectively (P=0.36), with the median OS not reached in either group (P=0.17). Tumor marker levels did not have any prognostic or predictive role. The toxicity profile was similar to that of other sorafenib trials. Conclusion: Sorafenib is an effective and well-tolerated treatment in advanced thyroid cancers.Öğe Epidemiology of colorectal cancer in Turkey: A cross-sectional disease registry study (A Turkish Oncology Group trial)(Aves, 2015) Aykan, Nuri Faruk; Yalcin, Suayib; Turhal, N. Serdar; Ozdogan, Mustafa; Demir, Gokhan; Ozkan, Metin; Yaren, ArzuBackground/Aims: This study aimed to determine the epidemiological characteristics of colorectal cancer in Turkey. Materials and Methods: In this multicenter, prospective, and cross-sectional registry study, data for 968 patients with colorectal cancer from 21 centers in 7 geographic regions were analyzed. Results: Diagnosis was colon cancer in 662 (68.4%) and rectum cancer in 306 (31.6%) patients. In total, 60.9% of patients was male; mean age was 58.9 +/- 12.6 years. Among patients, 15.0% was drinking alcohol, 17.5% was smoking, 1.5% had familial history of polyposis, 15.0% had diabetes mellitus, 1.0% had inflammatory bowel disease. Fruit and vegetable consumption was low (<3 times/week) in 35.5% and red meat consumption was high (>= 3 times/week) in 47.4% of the patients. Median time-to diagnosis was 3.0 months and 4.0 months for patients with colon and rectum cancer, respectively. Mean body mass index was >25 in all group of patients. Distal rectum (61.3%) and sigmoid colon (36.8%) were the most common locations of cancer, for rectum and colon respectively. In total, 85.6% of patients were operated; 25.8% had emergency surgery. Low anterior resection rate was 64.2% in rectum cancer. In majority (89.8%) of the patients with rectum cancer who received preoperative treatment, conventional chemo-radiotherapy regimen was given. pTNM staging at diagnosis showed that stage III and IV patients were in majority (35.9% and 29.7%, respectively). Conclusion: Colon cancer is more frequent than rectum cancer in Turkey. Colorectal cancer patients are diagnosed at later stages. Most of the cases were operated. Interregional differences for risk factors are worthwhile for evaluation in future trials.Öğe The impact of systemic inflammatory markers on survival in metastatic gastric cancer patients receiving first-line chemotherapy(2019) Bozkurt, Oktay; Firat, Sedat Tarik; Dogan, Ender; Cosar, Ramazan; Inanc, Mevlude; Ozkan, MetinABSTRACT Aim: The prognostic impact of elevated systemic inflammatory tools, including the neutrophil-lymphocyte ratio (NLR) and the platelet-lymphocyte ratio (PLR), remains moot in cancer patients. This research was performed to explore the predictive worth of these markers for prognoses in metastatic gastric cancer (mGC) patients receiving chemotherapy.Material and Methods: We retrospectively appraised 158 patients diagnosed with mGC between February 2009 and November 2017. According to threshold values that were identified by receiver operating characteristic (ROC) curve analysis, the NLR and PLR were each divided into two groups: ≤ 2.11 and >2.11, ≤ 158.8, and >158.8, respectively. The Cox proportional hazards model was applied to uncover the probable predictors of progression-free survival (PFS) and overall survival (OS).Results: According to univariate analysis, poor performance status, high NLR, high PLR, and anemia were significantly correlated with inferior OS receiving first-line palliative chemotherapy. High NLR, high PLR, and anemia were significantly correlated with poor PFS. In the multiple analysis, an elevated NLR was identified to be an independent predictor of inferior OS (OR: 2.70, 95% CI: 1.75-4.16, p0.001) and PFS (OR: 1.47, 95% CI: 1.00-2.17, p=0.047). Additionally, anemia was independent prognostic factors for the OS (OR: 0.69, 95% CI: 0.47-0.99, p=0.046).Conclusion: Findings of this research revealed that NLR was an independent prognostic tool of PFS and OS in mGC patients undergoing first-line chemotherapy.Keywords: Metastatic gastric cancer; neutrophil to lymphocyte ratio; platelet-to-lymphocyte ratio; prognosis.Öğe Outcome of 561 non-metastatic triple negative breast cancer patients: Multi-center experience from Turkey(Imprimatur Publications, 2014) Budakoglu, Burcin; Altundag, Kadri; Aksoy, Sercan; Kaplan, Muhammed A.; Ozdemir, Nuriye Y.; Berk, Veli; Ozkan, MetinPurpose: Triple-negative breast cancers account for 15% of breast carcinomas and, when present as early-stage disease, they are associated with higher rates of recurrence and early distant metastasis risk when compared to hormone receptor positive and human epidermal growth factor receptor (HER-2) positive breast cancers. In this study we aimed to explore the basic clinicopathological characteristics, prognostic factors and recurrence patterns of non-metastatic triple negative breast cancer patients. Methods: In this study 561 non-metastatic triple-negative breast cancer female patients admitted to 8 different cancer centers in Turkey between 2000 and 2010 were retrospectively evaluated through their medical records, to identify the basic clinico-pathological characteristics, prognostic factors and recurrence patterns. Results: The ratio of triple-negative breast cancer was 12%. The median age of patients was 48 years, of whom 311 (55.4%) were premenopausal. The majority had early-stage breast cancer at the time of diagnosis (16.8% stage I, 48.1% stage II, 35.1 % stage III) and the most commonly identified variant was invasive ductal carcinoma (84.1%). Grade II and III tumors were 27.1 and 48.5%, respectively. Adjuvant chemotherapy was administered to 90.5% of women and adjuvant radiotherapy to 41.2%. Median patient follow up was 28 months (range 3-290). During the follow up period 134 (23.8%) patients developed metastatic disease. In most of these cases, metastatic sites were bone, soft tissue, and lung. Factors affecting disease free survival (DFS) and overall survival (OS) were age (both p<0.001), lymph node involvement (both p<0.001), lymphovascular invasion (LVI) (p<0.001 and p=0.004, respectively), tumor stage (both p<0.001), adjuvant administration of anthracycline-based chemotherapy (both <0.001) and type of surgery (not significant for DFS but p=0.05 for OS). Three-year DFS and OS were 72.0 and 93.0%, respectively. Conclusion: Age, lymph node involvement, LVI, stage, and adjuvant chemotherapy were determined as prognostic factors for DFS and OS. The most common recurrence sites were bone, soft tissue and the lung. Further prospective randomised trials are needed to confirm the prognostic and predictive factors identified in this study.Öğe Risk factors for 30-day mortality in patients with cancer and COVID-19 in Turkey: A single center retrospective study(2022) Mutlu, Emel; Firat, Sedat Tarik; Inanc, Mevlude; Bozkurt, Oktay; Cosar, Ramazan; Ozkan, MetinAim: We aimed to investigate the factors affecting mortality in cancer patients with COVID-19. Materials and Methods: 120 cancer patients followed-up in Erciyes University Medical Oncology Department were included in the study. Patients with a diagnosed cancer over the age of 18 years and diagnosis of COVID-19 between April 1 and December 1 2020 were participated in the study. The relationship between clinical, demographic, laboratory values and 30-day mortality were evaluated using the Chi-square and Fisher's exact test. Risk factors for mortality were identified by univariable and multivariable logistic regression models. Results: 120 cancer patients were accepted in the study and 30 (25%) had died within 30 days after COVID-19 positivity. Hospitalization rate of cancer patients with COVID-19 was 67.5% and 23 (19.2%) of patients were admitted to intensive care unit (ICU). 34.6% of hospitalized patients and 95.7% of those admitted in the ICU died within 30 days. In multivariable logistic regression analysis, it was concluded that the presence of lymphopenia (OR 2.2, 95% CI 1.54-13.6, p = 0.04), high neutrophil-lymphocyte ratio (NLR) (OR 3.1, 95% CI 1.21-9.8, p = 0.02), dyspnea (OR 2.5 95% CI 0.32-11.2, p = 0.04), lung cancer diagnoses (OR 3.3 95% CI 1.54-9.7, p = 0.03), male gender (OR 2.17 95% CI 1.1-7.3, p = 0.03) ) were determined that increased 30-day mortality. Conclusion: High incidence of cancer and the risk of immunosuppression in these patients increased the importance of COVID-19. Cancer patients with COVID-19 need to be treated more carefully because they are vulnerable to infection and can be mortal.Öğe Turkish Breast Cancer Registry: A multicenter epidemiologic study(Lippincott Williams & Wilkins, 2014) Coskun, Ugur; Gumus, Mahmut; Uncu, Dogan; Ozkan, Metin; Cicin, Irfan; Altundag, Kadri; Elklran, Tamer[Abstract Not Available]Öğe Turkish National Breast Cancer Registry.(Amer Soc Clinical Oncology, 2015) Altundag, Kadri; Dumanli, Esra; Aliustaoglu, Mehmet; Uncu, Dogan; Ozkan, Metin; Cicin, Irfan; Coskun, Ugur[Abstract Not Available]Öğe Tyrosine kinase inhibitors in the treatment of metastatic renal cell cancer patients with early cytokine intolerance: TURCOS, a Turkish national, prospective observational study(Sage Publications Ltd, 2021) Benekli, Mustafa; Gumus, Mahmut; Ozkan, Metin; Dane, Faysal; Elkiran, Emin T.; Cicin, Irfan; Sevinc, AlperObjective Cytokines have been the mainstay of treatment in metastatic renal cell cancer (mRCC) for decades before the introduction of tyrosine kinase inhibitors (TKIs), which dramatically changed the therapeutic landscape in these patients. This observational study was designed to evaluate use of TKIs in the treatment of cytokine-intolerant mRCC patients. Methods A total of 151 cytokine-intolerant mRCC patients who were treated with TKIs (sunitinib, pazopanib and sorafenib) were enrolled in this prospective, non-interventional, multi-center observational study at 16 oncology centers across Turkey. Mean (SD) age was 61.3 (11.1) years and 74.8% were males. Data on duration of TKI treatment was the primary outcome measure. Additionally, overall response rate (ORR), progression free survival (PFS), overall survival (OS) and safety data were recorded. Results Median duration of treatment was 8.2 months at a median follow up of 17.9 months. ORR and disease control rate were 12.5% and 70.8%, respectively. Median PFS and OS were 7.5 months (95%CI: 6.4-10.4) and 27.3 months (95%CI: 17.6-27.3) with no significant difference among three TKI agents in terms of treatment duration, ORR, PFS and OS. The most common adverse events excluding progression-which was the protocol requirement were diarrhea (13.6%), asthenia (13.6%) and hand-foot syndrome (12.6%). Dose modifications were required in 30.5% of the patients and 15% discontinued TKIs because of toxicity. Conclusions Our findings confirm the efficacy and safety profile of TKIs in the first-line treatment of mRCC patients intolerant to cytokine treatment. There was no significant difference among three TKI agents in terms of treatment duration, ORR, PFS and OS.
