Browsing by Author "Guvenc, Birol"

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    Characteristics and Outcomes of Myelodysplastic Syndrome Patients Treated With Darbepoetin Alfa for Anemia in Turkey: A Multicenter Retrospective Study
    (CLINICAL LYMPHOMA MYELOMA & LEUKEMIA, 2023) Acar, Ibrahim Halil; Atalay, Figen; Demirsoy, Esra Terzi; Can, Ferda; Guven, Zeynep Tugba; Cetiner, Mustafa; Tombak, Anil; Comert, Melda; Guvenc, Birol
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    Evolution of clinical characteristics of patients with paroxysmal nocturnal hemoglobinuria treated with eculizumab in turkey: a multicenter retrospective analysis
    (2021) Karadag, Fatma Keklik; Yenerel, Mustafa Nuri; Yilmaz, Mehmet; Uskudar, Hava; Ozkocaman, Vildan; Tuglular, Tulin Firatli; Erdem, Fuat; Unal, Ali; Ayyildiz, Orhan; Ozet, Gulsum; Comert, Melda; Kaya, Emin; Ayer, Mesut; Salim, Ozan; Guvenc, Birol; Ozdogu, Hakan; Mehtap, Ozgur; Sonmez, Mehmet; Guler, Nil; Hacioglu, Sibel; Aydogdu, Ismet; Bektas, Ozlen; Toprak, Selami Kocak; Kaynar, Lale; Yagci, Munci; Aksu, Salih; Tombak, Anil; Karakus, Volkan; Yavasoglu, Irfan; Onec, Birgul; Ozcan, Mehmet Ali; Undar, Levent; Ali, Ridvan; Ilhan, Osman; Saydam, Guray; Sahin, Fahri; 34322292
    Paroxysmal nocturnal hemoglobinuria (PNH) is a rare X-linked genetic disorder. On the contrary to its name, it is a multisystemic disease and various symptoms other than hemoglobinuria could be occurred. It could be life threatening especially because of thromboembolic events. In the last decade, a terminal complement inhibition with eculizumab approved with promising results for PNH patients. We conducted this study to evaluate the long term experience of eculizumab therapy from Turkey for the first time. Our cohort included 138 patients with PNH treated with eculizumab between January 2008 and December 2018 at 28 centers in Turkey. Laboratory and clinical findings at the time of diagnosis and after eculizumab therapy were recorded retrospectively. The median age was 39 (range 18-84) years and median granulocyte PNH clone size was 74% (range 3.06-99.84%) at the time of diagnosis. PNH with bone marrow failure syndrome was detected in 49 patients and the rest of 89 patients had classical PNH. Overall 45 patients (32.6%) had a history of any prior thrombotic event before eculizumab therapy and only 2 thrombotic events were reported during the study period. Most common symptoms are fatigue (75.3%), hemoglobinuria (18.1%), abdominal pain (15.2%) and dysphagia (7.9%). Although PNH is commonly related with coombs negativity, we detected coombs positivity in 2.17% of patients. Seven months after the therapy, increased hemoglobin level was seen and remarkably improvement of lactate dehydrogenase level during the treatment was occurred. In addition to previous studies, our real life data support that eculizumab is well tolerated with no serious adverse events and improves the PNH related findings.
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    Impact of COVID-19 on Outcomes of Patients with Hematologic Malignancies: A Multicenter, Retrospective Study
    (2022) Acar, Ibrahim Halil; Guner, Sebnem Izmir; Aslaner Ak, Muzeyyen; Gocer, Mesut; Ozturk, Erman; Atalay, Figen; Sincan, Gulden; Yikilmaz, Aysun Senturk; Ekinci, Omer; Ince, Idris; Gulturk, Emine; Demir, Nazli; Dogan, Ali; Ipek, Yildiz; Guvenc, Birol; https://orcid.org/0000-0003-4384-2913; 36425152
    Objectives: Patients with hematological malignancies have a high risk of mortality from coronavirus disease 2019 (COVID-19). This study aimed to investigate the impact of COVID-19 on mortality rates in patients with various hematological malignancies and to determine risk factors associated with all-cause mortality.Methods: A multicenter, observational retrospective analysis of patients with hematological malignancies infected with COVID-19 between July 2020 and December 2021 was performed. Demographic data, clinical characteristics, and laboratory parameters were recorded. Patients were grouped as non-survivors and survivors. All-cause mortality was the primary outcome of the study.Results: There were 569 patients with a median age of 59 years. Non-Hodgkin lymphoma (22.0%) and multiple myelomas (18.1%) were the two most frequent hematological malignancies. The all-cause mortality rate was 29.3%. The highest mortality rates were seen in patients with acute myeloid leukemia (44.3%), acute lymphoid leukemia (40.5%), and non-Hodgkin lymphoma (36.8%). The non-survivors were significantly older (p<0.001) and had more comorbidities (p<0.05). In addition, there were significantly more patients with low lymphocyte percentage (p<0.001), thrombocytopenia (p<0.001), and high CRP (p<0.001) in the non-survived patients. Age >= 65years (p=0.017), cardiac comorbidities (p=0.041), and continuation of ongoing active therapy for hematological cancer (p<0.001) were the independent risk factors for the prediction of mortality.Conclusions: In patients with hematological malignancies, coexistent COVID-19 leads to a higher mortality rate in elderly patients with more comorbidities. Acute myeloid and lymphoid leukemia and non-Hodgkin lymphoma have the highest mortality rates. Older age, cardiac diseases, and continuation of ongoing active therapy for hematological cancer are the independent risk factors for mortality in hematological malignancy patients with COVID-19.