Publications by authors named "Tarık Onur Tiryaki"

Objective: Graft-versus-host disease (GvHD) is a common and serious complication following allogeneic hematopoietic stem cell transplantation (allo-HSCT), significantly impacting transplant efficacy. In the treatment of GvHD, numerous therapeutic approaches have been explored, with mesenchymal stem cells (MSCs) emerging as a prominent immunomodulatory option. We aimed to evaluate efficacy and outcomes of using MSCs for steroid refractory acute GVHD (SR-aGvHD) management.

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Objectives: Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is a potentially curative treatment for hematological diseases, with success rates improving due to advancements in conditioning regimens and new anti-graft versus host disease (GVHD) drugs. Ruxolitinib, an oral selective Janus kinase (JAK) 1 and 2 inhibitor has been used to mitigate the effects of various inflammatory and myeloproliferative syndromes, given the JAK kinase pathway's central role in cytokine signaling during inflammatory and immune processes. In this study we aimed to assess ruxolitinib's efficacy in patients with chronic GVHD (cGVHD).

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Objectives: In this study, we aimed to compare the engraftment days, graft versus host disease (GVHD) development, relapse and overall survival (OS) rates in patients using variable intensity conditioning regimens with two different post-transplant cyclophosphamide (PTCy) doses for hematological malignancies.

Material And Methods: We retrospectively analyzed 162 patients who have had PTCy at a dose of 25 mg/kg × 2 and 50 mg/kg × 2 between 2018 and 2024. Patients were divided in 2 groups; PTCy dose with 25 mg/kg × 2 (Group 1, n = 45) and PTCy dose with 50 mg/kg × 2 (Group 2, n = 117).

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Background: Although most patients with atypical hemolytic uremic syndrome (aHUS) have variants in genes participating in alternative complement pathways, rare variants in non-complement pathway-related genes, including DGKE, INF2, MMACHC, PLG, and THBD, have also been described.

Case Presentation: We report an 18-year-old male patient with renal biopsy-proven chronic thrombotic microangiopathy that raised suspicion of aHUS. Whole-exome sequencing revealed a novel pathogenic homozygous MMACHC c.

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Background: Many factors were identified for mobilization failure (MF) in autologous hematopoietic stem-cell transplantation. To our knowledge, this is the first study to investigate the efficacy of baseline inflammation indexes and neutrophil-to-lactate dehydrogenase (LDH) ratio to predict MF in multiple myeloma (MM) and lymphoma.

Methods: A total of 240 patients with lymphoma or MM hospitalized between January 2014 and June 2022 for the first stem cell mobilization were included in this retrospective single-center study.

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Article Synopsis
  • - Mastocytosis is a rare disorder categorized into three types: Cutaneous mastocytosis, systemic mastocytosis, and mast cell sarcoma, requiring collaboration among various medical specialties for accurate diagnosis.
  • - In a study of 104 adult cases, 82.7% were systemic mastocytosis, with issues like osteoporosis and secondary malignancies being notable concerns, particularly affecting survival rates.
  • - The prognosis varies significantly; indolent forms have better outcomes, while aggressive forms are linked to a poorer prognosis, influenced by specific factors including mast cell concentration in bone marrow and related complications.
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Objective: Clinical nutrition outpatient clinics (CNOCs) are the mainstay of the nutrition bundle in hospitals. They are important for the diagnosis, treatment, and follow-up of outpatients with malnutrition (MN) and sarcopenia. The aim of this study was to evaluate changes in muscle mass during the treatment of MN in patients admitted to CNOCs.

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Objective: Redditux (RED), as a biosimilar rituximab, was approved in Turkey for all indications of the original Mabthera (MAB) in March 2018. The aim of our study was to evaluate the efficacy and safety of RED in de novo diffuse large B-cell lymphoma.

Materials And Methods: Fifty-one patients received RED combined with the CHOP regimen.

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Introduction/background: The emergence of novel agents targeting the B-cell receptor pathway and BCL-2 has significantly changed the therapeutic landscape of CLL. We evaluated the safety and efficacy of single-agent ibrutinib in relapsed/refractory CLL in real-world settings.

Patients/methods: A total of 200 relapsed/refractory CLL patients with a median age of 68 were included in this retrospective, multicenter, non-interventional study.

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Purpose: This study investigates the prognostic value of Ga-Pentixafor PET/CT using PET-derived quantitative in multiple myeloma (MM) patients with suspected recurrence in comparison to F-FDG PET/CT and clinical data.

Methods: Twenty-four MM patients with suspicion for relapse who underwent Ga-Pentixafor and F-FDG PET/CT were retrospectively evaluated. Total bone marrow glycolysis for F-FDG (TBM) and total bone marrow uptake for Ga-Pentixafor PET/CT (TBM) were calculated using whole-body metabolic tumor burden obtained by dedicated software (MIM 7.

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First identified in China in December 2019, coronavirus disease 2019 (COVID-19) has rapidly evolved into a global pandemic. The presence of haematological malignancies are expected to increase the risk of adverse outcomes from this viral infection due to the immunosuppression brought about by the underlying cancer and the effects of therapy. We present a 55-year-old woman diagnosed with relapsed/refractory Hodgkin's lymphoma (HL) who had been heavily pretreated with multiagent chemotherapy, autologous hematopoietic stem cell transplantation (autoHCT), allogeneic hematopoietic stem cell transplantation (alloHCT) and was complicated with EBV associated posttransplant lymphoproliferative disease (PTLD) and chronic graft-versus-host-disease (GVHD).

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Background: Knowledge on endothelial dysfunction and its relation to atherosclerosis in mastocytosis is limited.

Objective: To investigate the endothelial function in mastocytosis by flow-mediated dilatation (FMD) and biomarkers related to vascular endothelia and to evaluate its relationship with the presence of subclinical atherosclerosis by carotid intima media thickness (CIMT).

Methods: A total of 49 patients with mastocytosis and 25 healthy controls (HCs) were included.

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A review of the literature on COVID-19 pandemic in patients with thalassemias is presented. Globally, the prevalence of COVID-19 among  β-thalassemia patients seems to be lower than in general population; associated co-morbidities aggravated the severity of  COVID- 19, leading to a poorer prognosis, irrespective of age. A multicenter registry will enhance the understanding of COVID-19 in these patients and will lead to more evidence-based management recommendations.

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Multiple myeloma is a type of plasma cell disorder and can be seen in different forms. According to current knowledge, it is not a curable disease. Smoldering multiple myeloma (SMM) is an asymptomatic clonal plasma cell disorder and distinguished from monoclonal gammopathy of undetermined significance by a much higher risk of progression to multiple myeloma.

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Objectives: This study aims to investigate, retrospectively, the epidemiological and clinical characteristics, laboratory results, radiologic findings, and outcomes of COVID-19 in patients with transfusion-dependent β thalassemia major (TM), β-thalassemia intermedia (TI) and sickle cell disease (SCD).

Design: A total of 17 Centers, from 10 countries, following 9,499 patients with hemoglobinopathies, participated in the survey.

Main Outcome Data: Clinical, laboratory, and radiologic findings and outcomes of patients with COVID-19 were collected from medical records and summarized.

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Extramedullary disease (EMD) incidence is between 7% and 18% in multiple myeloma. Overall survival of patients who develop EMD is significantly shorter than that of patients without EMD. Malignant myelomatous pleural effusions (MPEs) are rarely observed, occurring in less than 1% of cases.

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Background: C3 glomerulopathy (C3GP) is a recently identified and described disease that has a high risk of progressing into end-stage renal disease. We aimed to evaluate the effects of various immunosuppressive regimens on C3GP progression because there are conflicting data on the treatment modalities.

Methods: In this retrospective study of 66 patients with C3GP, 27 patients received mycophenolate mofetil (MMF)-based treatment, 23 received non-MMF-based treatment (prednisolone or cyclophosphamide), and 16 received conservative care.

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