Umit Yavuz Malkan

Umit Yavuz Malkan
Hacettepe University · Department of Haematology

Doctor of Medicine

About

140
Publications
12,677
Reads
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653
Citations
Additional affiliations
May 2018 - present
Dışkapı Yıldırım Beyazıt Training and Research Hospital
Position
  • Professor (Associate)
May 2018 - present
Dışkapı Yıldırım Beyazıt Training and Research Hospital
Position
  • Professor (Associate)
May 2017 - May 2018
Dışkapı Yıldırım Beyazıt Training and Research Hospital
Position
  • Hematologist

Publications

Publications (140)
Article
Lithium, which is widely used in mood disorders, has several side effects. Lymphocytosis is a rare side effect. The patient was a young man in his twenties. The patient referred from psychiatry for persistent lymphocytosis. After the initial evaluation, the possible relationship between lithium and lymphocyte levels was considered. The diagnosis of...
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Background: Multicentric Castleman disease (MCD) is a rare, aggressive lymphoproliferative disorder. Human herpesvirus-8 (HHV-8) has an important role in the pathogenesis of the disease and its association with Kaposi’s sarcoma has been reported, especially in people living with human immunodeficiency virus (HIV). In this report, we present the cas...
Article
Lipotoxicity can mediate endothelial dysfunction in obesity. Altered endothelial cell phenotype during the pathobiological course of the lipotoxicity may lead to hemostatic abnormalities, which is a hallmark of several hematological disorders. Impaired hemostasis could also be directly related to numerous metabolic diseases such as hypertension, di...
Article
Bacillus thermoamylovorans is a species of bacillus that causes structural defects in milk by contaminating milk with its heat-resistant spores. We report a case of diffuse pustular rash on the extremities and bacillus thermoamylovorans bacteremia in blood culture after erythrocyte suspension replacement. On admission, his acute phase reactants wer...
Article
Background Tigecycline-associated hypofibrinogenemia has been reported as an important adverse effect in recent years, but controlled studies minimizing confounding factors are needed. The objective of our study was to assess changes in fibrinogen levels in patients for hospitalization, comparing two antibiotic episodes (tigecycline and other) with...
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Background/aim Early detection and treatment are crucial in combating malignant melanoma. Src is an important therapeutic target in melanoma due to its association with cancer progression. However, developing effective Src-targeting drugs remains challenging and personalized medicine relies on biomarkers and targeted therapies for precise and effec...
Article
Objective: Low dose Ara-C and hypomethylating agents (HMAs) - decitabine (DEC) and azacitidine (AZA) - have made it possible to treat more elderly patients with acute myeloid leukemia (AML). Both HMAs demonstrated efficacy in monotherapy and in combination with targeted therapies. We analyzed the outcomes of elderly and unfit patients with newly di...
Article
Introduction: Standard induction chemotherapy in newly diagnosed acute myeloid leukemia (AML) includes a combination of standard-dose cytarabine and an anthracycline (idarubicin [IDA], daunorubicin [DNR], or mitoxantrone [MXR]). Anthracycline selection is still not standardized, and the impact of anthracycline selection on survival and response in...
Article
Background: It is evident that treatment outcomes improve with the clinical studies, in this study we aimed to investigate the demographics and treatment modalities of the acute myeloid leukemia (AML) patients in a large population-based cohort who were diagnosed and followed up in Turkey as a real-world data. Methods: All AML adult patients who we...
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Background/aim The clinical presentation of pediatric coronavirus disease 2019 (COVID-19) is associated with a milder disease course than the adult COVID-19 syndrome. The disease course of COVID-19 has three clinicobiological phases: initiation, propagation, and complication. This study aimed to assess the pathobiological alterations affecting the...
Article
The COVID-19 syndrome following the SARS-CoV-2 infection has three unique immunogenomic disease development phases; initiating, propagating, and complicating. Each COVID-19 phase has critical pathobiological correlations requiring distinct therapeutic clinical interventions. Renin-angiotensin system (RAS) genes are essential for initiating infectio...
Article
Primary adrenal lymphoma (PAL) is an extremely rare among the causes of adrenal incidentaloma. Most were diagnosed with adrenal insufficiency and B symptoms (unexplained weight loss, night sweats, fever). This article presented a 57-year-old woman who was investigated for bilateral adrenal masses found incidentally on computed tomography (CT). Phys...
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As in the case of cancer, the risk of infection increases when the host's immune system is not working properly. It has been shown that toxins produced by the bacteria responsible for bacterial infections can alter the properties of cancer cells as well as their sensitivity to chemotherapy agents. Staphylococcus aureus (S. aureus) is one of the mos...
Article
Objective: The systemic immun inflamation index(SII) has been considered a novel prognostic biomarker in several malignant tumors. The aim of current study is to determine association between SII and prognosis of patients with Diffuse Large B Cell Lymphoma (DLBCL). Material and Method: A total of 101 patients with DLBCL included in the study. Recei...
Preprint
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Introduction: In the recent years alternate day dosing has been recommended in iron deficieny treatment. The aim of this study is to compare the efficacy and side effects of oral iron treatments given daily 1x1, alternate day 1x1 and 2x1 alternate day dosing in iron deficieny anemia patients. Methods: A total of 52 patients with a diagnosis of iron...
Article
Objective: Cardiovascular system health becomes important with the extended survival of chronic myeloid leukemia (CML) patients. Cardiotoxicities are related to the second- and third-generation tyrosine kinase inhibitors (TKIs). The most frequent and important cardiovascular events are myocardial infarction, stroke and peripheral arterial disease,...
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Supplemental probiotics available without a doctor's prescription have become a booming global market in past few years. Medical research has shown that probiotics may benefit both healthy people and cancer patients by improving their immune systems and digestive health. Even though they seldom produce serious side effects, it's important to note t...
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Objectives: Chronic myeloproliferative diseases (CMPD) are neoplastic disorders leading to hypercoagulability and thrombosis. The critical hemostatic abnormalities include alterations in the blood viscosity and a history of recent thrombus. The aim of this study is to assess the interrelationships among the atherogenic index of plasma (AIP) and thr...
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Ankaferd Hemostat (ABS) is a hemostatic agent of plant-extract acting on red blood cells used for achieving hemostasis. ABS has anti-inflammatory, anti-microbial, anti-fungal, anti-oxidative and anti-neoplastic effects. Cancer treatment is a challenging clinical condition that can lead to numerous clinical complications of different severity. Antin...
Article
Introduction: Tyrosine kinase inhibitors (TKis) and Bruton's TKi (BTKis) constitute broadly used antitumor drug groups with almost completely tolerable and manageable side-effect profiles. Mainly side effects are cardiovascular and gastrointestinal for the TKi group. Hypophosphatemia is documented frequently in many studies with TKis but rarely me...
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Objective: We aimed to delineate the effects of the ABO groups and the main clinical outcomes with the current SARS-CoV-2 variants, i.e., delta and omicron. Materials and Methods: In this retrospective case-control study, the total 360 adult COVID-19 patients who were followed in the pandemic waves of delta and omicron variants and had ABO blood gr...
Article
Background: Since well-designed prospective comparative trials are lacking, haploidentical hematopoietic stem cell transplantations approach should be based on the expertise of a particular center. In this study, we aimed to report the results and outcomes of patients who underwent haploidentical hematopoietic stem cell transplantation. Methods:...
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Despite recent therapeutic advances, the prognosis of patients with relapsed/refractory (RR) primary (PCNSL) and secondary central nervous system lymphoma (SCNSL) remains poor. Therefore, the need for new treatment options in CNSL continues. Ibrutinib has been used in clinical trials for CNSL in recent years. However, there is no real-life data on...
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The SARS-CoV-2 spike protein mRNA-based vaccines have prevented countless mortality and morbidity, and have an excellent risk/benefit ratio. However, various adverse events may rarely occur after the BNT162b2 vaccine, like any other medical intervention. The COVID-19 itself and the spike protein produced endogenously by mRNA vaccines may have immun...
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Objective: Imatinib is a commonly used first generation tyrosine kinase inhibitor for patients with chronic myeloid leukemia (CML). The efficacy has been reported as very high even in recent studies. Material and methods: A retrospective analysis was made of newly diagnosed CML patients treated with Imatinib as a first-line agent from January 2010...
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Acute myeloid leukemia (AML) is the most heterogeneous hematological disorder and blast cells need to fight against immune system. Natural killer (NK) cells can elicit fast anti-tumor responses in response to surface receptors of tumor cells. NK-cell activity is often impaired in the disease, and there is a risk of insufficient tumor suppression an...
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Patients with isolated leukopenia pose difficulties in diagnosis because there is no related guideline in the literature. In this study, our aim was to evaluate the clinical and laboratory associations of isolated, nonspecific (not related to neutropenia) leukopenia. In this retrospective data review study, patients who were admitted to Hacettepe U...
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Materials and methods: Up to June 2022, literature searches were performed using the internet search engines Medline, Google Scholar, and Embase: Ankaferd. PRISMA flow diagram described the Ankaferd search. Results: ABS have important effects in several cellular processes, like control of the cell cycle, apoptosis, angiogenesis, signal transduct...
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Objective: Viral infections could complicate hematopoiesis and, in some cases, they may worsen the clinical prognosis of blood disorders. SARS-CoV-2 and COVID-19, as a viral disease, can have serious impact on the disease course of hematological neoplastic diseases and can cause hematological complications. The aim of this paper is to review the h...
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Introduction Coronavirus disease 2019 (COVID-19) were declared as pandemic by World Health Organization. With this study, we aimed to define our patients who were followed up with malign or benign hematological diagnoses and diagnosed with COVID-19; determine the distribution of this infection in patient groups and contribute to the literature by...
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Objective: The studies comparing the efficacy and safety of prophylactic regimens for central nervous system (CNS) involvement in acute lymphoblastic leukemia (ALL) are scarce in adults. This multi-center retrospective study aimed to compare the efficacy of prophylactic regimens with and without CNS irradiation on the development of CNS relapse du...
Article
Background: Thrombocytopenia is a common complication following hematopoietic stem cell transplantation (HSCT). Eltrombopag has been used in thrombocytopenia treatment after HSCT in recent years. Herein, we present our experience of 25 patients treated with eltrombopag for post-HSCT thrombocytopenia. Methods: Fifteen autologous hematopoietic ste...
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Background: Despite mass vaccination, the SARS-CoV-2 vaccine-induced subacute thyroiditis (SAT) is rarely seen as a complication. The reason why some individuals are susceptible to developing vaccine-induced SAT is not yet known. SAT develops in genetically predisposed individuals who carry specific human leukocyte antigen (HLA) haplotypes. It is...
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In some patients with chronic myeloproliferative neoplasms, myelofibrosis (MF) develops as natural evolution of the disease. The aim of this study was to analyze predictive factors that may cause MF in polycythemia vera (PV) and essential thrombocythemia (ET) patients. This retrospective study was conducted on PV and ET patients who attended our ho...
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Purpose Enterococcus faecalis ( E. faecalis ) is an important commensal microbiota member of the human gastrointestinal tract. It has been shown in many studies that infection rates with E. faecalis in gastric cancer significantly increase. It has been scientifically proven that some infections develop during the progression of cancer, but it is st...
Article
Case report A 61-year-old male patient who had previously been splenectomized for immune thrombocytopenia, hospitalized with mucosal bleeding. Upon failure to respond to steroid, intravenous immunoglobulin, rituximab, danazol, azathioprine and eltrombopag treatment, autologous hematopoietic stem cell transplantation was performed to the patient. At...
Article
Objective Coronavirus disease 2019 is an infectious disease caused by the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Clinical and laboratory predictors may identification of patients at risk of mortality and guide treatment .To analyze laboratory abnormalities in patients with COVID-19 and define which parameters affect mor...
Article
Interferon (IFN) family has a significant impact on both SARS-CoV and SARS-CoV-2. The aim of this current bioinformatics study is to assess IFN-gene family alterations following the SARS-CoV infection in association with the iron metabolism and lymphoid biology.Gene expression data of human bronchial epithelial cells treated with SARS-CoV for 12, 2...
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Background/aim: The disease caused by SARS-CoV-2 was named as COVID-19. There is as yet insufficient information about the effects of HSCT on the clinical course of COVID-19. In the present study, we aimed to investigate the clinical course of COVID-19 in patients who had undergone HSCT. Materials and methods: We analyzed baseline characteristic...
Article
Introduction All-trans retinoic acid (ATRA) is a physiological metabolite of vitamin A and it is used for the treatment of acute promyelocytic leukemia (APL). Hypercalcemia is a rare side effect of ATRA and it may be potentiated after interaction of ATRA with azole group antifungals. Herein, we have reported an APL case with hypercalcemia that is c...
Article
Background/aim: COVID-19 syndrome due to the SARS-CoV-2 virus is a currently challenging situation ongoing Worldwide. Since the current pandemic of the SARS-CoV-2 virus is a great concern for everybody in the World, the frequently asked question is how and when the COVID-19 process will be concluded. The aim of this paper is to propose hypotheses...
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Background/aim: Graft-versus-host disease (GVHD) is a crucial complication leading to significant morbidity and mortality allogeneic hematopoietic stem cell transplantation which occurs in approximately half of the transplant recipients. Suppression of tumorigenicity 2 (ST2) and regenerating islet-derived 3-alpha(Reg3a) might be important biomarke...
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Background Autologous stem cell transplantation (ASCT) is one of the standard treatments of choice for eligible multiple myeloma (MM) patients. Herein, we aimed to analyze MM patients at our center and compare the clinical outcomes of single and double ASCT patients. Materials and methods Patients who were diagnosed as having MM and had undergone...
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Microangiopathic hemolytic anemia (MAHA) can be observed as a paraneoplastic syndrome (PS) in certain tumors. MAHA-related signet ring cell carcinoma (SRCC) of an unknown origin is very infrequent. Herein we present a SRCC case presented with refractory acquired thrombotic thrombocytopenic purpura (TTP). A 35-year-old man applied to the emergency s...
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Despite the availability of various treatment protocols, response to therapy in patients with Acute Myeloid Leukemia (AML) remains largely unpredictable. Transcriptomic profiling studies have thus far revealed the presence of molecular subtypes of AML that are not accounted for by standard clinical parameters or by routinely used biomarkers. Such m...
Preprint
Full-text available
Background: Enterococcus faecalis (E. faecalis) is an important commensal microbiota member of the human gastrointestinal tract. Many studies have shown that infection rates with E. faecalis increase significantly in gastric cancer. The infections that developed during the cancer progress are definitive scientific evidence, but it is still not clea...
Article
Full-text available
Objective: COVID-19 immune syndrome is a multi-systemic disorder induced by the COVID-19 infection. Pathobiological transitions and clinical stages of the COVID-19 syndrome following the attack of SARS-CoV-2 on the human body have not been fully explored. The aim of this review is to outline the three critical prominent phase regarding the clinico...
Article
Introduction Hemophagocytic lymphohistiocytosis (HLH) is an aggressive and life-threatening syndrome of excessive immune activation. Herein, we aimed to report a diffuse large B-cell lymphoma (DLBCL) case that was presented as HLH. Case report A 32-year-old man presented to a hospital with complaints of vomiting, nausea and diarrhea in October 201...
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Introduction Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a recently identified coronavirus family member that triggers a respiratory disease similar to severe acute respiratory syndrome coronavirus (SARS-CoV). SARS-CoV and SARS-CoV-2 are very similar to each other in many respects, such as structure, genetics, and pathobiology....
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Ankaferd hemostat (Ankaferd blood stopper [ABS], Istanbul, Turkey) is a hemostatic agent affecting red blood cell-fibrinogen interactions. ABS has been traditionally used in Anatolia as a hemostatic agent for centuries. ABS contains a standardized combination of the plants namely Glycyrrhiza glabra, Thymus vulgaris, Alpinia officinarum, Vitis vinif...
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The development of resistance towards chemotherapeutic drugs has become an obstacle in treatment of cancer. Ankaferd Hemostat [ABS] has shown to suppress the proliferation of melanoma cells, but little is known about its' mechanism. In this study, we demonstrate that ABS can make some melanoma cell lines such as A2058 more sensitive towards etoposi...
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Objective: Chronic antigenic stimulation is frequently blamed in the pathogenesis of extranodal marginal zone lymphomas including splenic marginal zone lymphoma (SMZL). Chronic hepatitis C is frequently observed in SMZL patients in some geographical regions. However, these reports are largely from North America and Europe. Data from other countrie...
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Background and aim In the past, acute promyelocytic leukemia (APL) was considered as one of the most rapidly lethal form of acute myeloid leukemia (AML). The objective of this study was to assess clinical parameters affecting early death (ED) in patients with APL. Materials and methods Forty-three patients with APL who were diagnosed at Hacettepe...
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Background and aim: The prognosis of patients with acute myeloid leukemia (AML) is affected from the factors that are both patient and disease specific. The aim of this study is to evaluate the impact of early versus late platelet and neutrophil recovery after induction chemotherapy on survival outcomes of acute myeloid leukemia patients. Materia...
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Purpose: Mantle Cell Lymphoma (MCL) is a B-cell neoplasm with CCND1 [t(11;14)(q13;q32), cyclin D1] translocation. The guidelines recommend various treatment options based on age, performance status and comorbidities. Our purpose was to analyze the clinical features and evaluate prognostic factors for survival of 78 MCL patients. Methods: We retr...
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Objective: The aim of the present study was to evaluate the efficacy and safety of eltrombopag, an oral thrombopoietin receptor agonist, in patients with chronic immune thrombocytopenia (ITP). Materials and Methods: A total of 285 chronic ITP patients (187 women, 65.6%; 98 men, 34.4%) followed in 55 centers were enrolled in this retrospective cohor...
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Background/aim: High-dose chemotherapy followed by autologous stem cell transplantation (ASCT) has become the standard approach for patients with relapsed/refractory Hodgkin’s lymphoma (HL) or non-Hodgkin’s lymphoma (NHL). In this study, we report the outcome of the mitoxantrone-melphalan conditioning regimen for lymphoma. Materials and methods:...