International journal of hematology-oncology and stem cell research最新文献

{"title":"Developing a Multichannel Bioreactor with a Collagen Scaffold, ECM, and Cryoprecipitate to Significantly Produce Platelets from Umbilical Cord Blood Stem Cells","authors":"Mohamad Hosein Derakhty Gonbad, Ali Baradar Khoshfetrat, Ali Akbar Movassaghpour, Zohre Sanaat, Hojjatollah Nozad Charoudeh","doi":"10.18502/ijhoscr.v17i4.13916","DOIUrl":"https://doi.org/10.18502/ijhoscr.v17i4.13916","url":null,"abstract":"Background: Platelets play a key role in the treatment of thrombocytopenia. Nowadays, platelets (PLTs) are only obtained through blood donation. However, due to the limitations in their preparation and storage, they are produced in laboratories, especially through bioreactors that convert megakaryocytes from stem cells into large-scale injectable PLTs.
 Materials and Methods: In this study, the CD34 cells isolated from cord blood were differentiated into megakaryocytes. A 6-chamber bioreactor with a two-layer collagen scaffold, several ECM factors, and human cryoprecipitate were used to simulate the structure of the bone marrow. After the addition of megakaryocytes to the scaffold, PLTs were produced due to the flow pressure and the interaction between the scaffold structure and the ECM factors.
 Results: CD41 + cells were expanded 100 times as much as CD34 + cord blood stem cells. The mean PLT release from one megakaryocyte in the pure collagen scaffold was 17.42 PLTs. Once fibrin, fibronectin, hyaluronic acid, and cryoprecipitates were added to collagen, the mean PLT release was 21.4, 22.4, 23.9, and 27.37, respectively. With the simultaneous addition of three factors to collagen (CFFH) and then four factors (CFFHC), the number of PLTs reached 30.52 and then 34.
 Conclusion: Functional PLTs can be produced on a large scale with a multi-chamber bioreactor using a combination of ECM and cryoprecipitate with collagen scaffolding.","PeriodicalId":94048,"journal":{"name":"International journal of hematology-oncology and stem cell research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135618388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Serum Vitamin B12 Levels in Patients with Colon and Breast Cancer: A Case-Control Study","authors":"Ghazaleh Haghighat, Ahmad Khajeh-Mehrizi, Hossein Ranjbar","doi":"10.18502/ijhoscr.v17i4.13914","DOIUrl":"https://doi.org/10.18502/ijhoscr.v17i4.13914","url":null,"abstract":"Background: It has been shown that increased serum levels of vitamin B12 may be associated with some malignancies. This study aimed to compare the serum levels of vitamin B12 in patients with colon and breast cancer and healthy individuals.
 Materials and Methods: In this case-control study, 140 patients with colon and breast cancer were compared with 140 healthy individuals matched in age, gender, and socioeconomic status. Serum levels of vitamin B12 were measured through the Electrochemiluminescence method in both groups. The normal serum level of vitamin B12 was between 200 and 800 pg/ml.
 Results: Among 280 enrolled subjects, 60 had serum vitamin B12 levels higher than 800 pg/ml. Forty-six (32.9%) patients had high serum vitamin B12 levels, compared to 14 (10.0%) subjects in the control group (P = 0.001). The mean serum vitamin B12 level was significantly higher in the patients (380.4 ±540.2 pg/ml vs. 278.0 ±314.08 pg/ml, P =0.001). There was no statistically significant difference in serum levels of vitamin B12 in patients with breast and colon tumors (P = 0.8). A significant positive correlation was observed between serum levels of vitamin B12 and tumor stage (P = 0.001, r = 0.49).
 Conclusion: The findings of this study showed that serum levels of vitamin B12 in patients with colon and breast cancer are higher than in healthy individuals and are positively associated with the stages of cancer.","PeriodicalId":94048,"journal":{"name":"International journal of hematology-oncology and stem cell research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135781008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correlation of Magnesium Level with Cardiac and Hepatic Hemosiderosis Measured by T2*MRI Technique and Age in Patients with Thalassemia Major","authors":"Ali Ghasemi, Kazem Ghaffari, Fatemeh Hoseini, Aziz Eghbali, Nooshin Sajadei, Vahid Falahati, Yazdan Ghandi","doi":"10.18502/ijhoscr.v17i4.13912","DOIUrl":"https://doi.org/10.18502/ijhoscr.v17i4.13912","url":null,"abstract":"Background: Given the association of hypomagnesemia with cardiac arrhythmia, the aim of this study was to investigate the relationship between serum magnesium levels with age and T2* magnetic resonance imaging (MRI) findings of the heart and liver in patients with thalassemia major (TM). &#x0D; Materials and Methods: In a descriptive cross-sectional study, a total of 62 patients with β-thalassemia major aged 11-48 years were selected at the Amir-Kabir Hospital, Arak, Iran. Serum magnesium, ferritin, and iron levels of patients were measured, and the rate of cardiac and hepatic hemosiderosis of patients was extracted according to the routine T2*MRI method. &#x0D; Results: The mean age of the patients at diagnosis was 32.6 years. The comparison of TM patients with and without hepatic/cardiac hemosiderosis demonstrated that mean levels of serum ferritin, serum iron, and age were significantly higher in TM patients with cardiac hemosiderosis than in hepatic/cardiac non-hemosiderosis (P < 0.05); however, there was no significant difference in mean levels of serum magnesium in TM patients with and without hepatic/cardiac hemosiderosis (P = 0.279). Interestingly, the correlation of age with serum magnesium levels in TM patients revealed a statistically significant and moderate inverse correlation (r = -0.56, P = 0.013).&#x0D; Conclusion: Hypomagnesemia may occur in a time-dependent manner. It is recommended that, in addition to cardiac and hepatic T2*MRI, serum magnesium levels be measured by using magnesium replacement if necessary.","PeriodicalId":94048,"journal":{"name":"International journal of hematology-oncology and stem cell research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135780848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adherence to Immunosuppressants among Adult Patients after Allogeneic Hematopoietic Stem-Cell Transplantation (Allo-HSCT): A Cross-Sectional Study","authors":"Atefe Derakhshan, Ava Mansouri, Aarefeh Jafarzadeh Kohneloo, Molouk Hadjibabaie","doi":"10.18502/ijhoscr.v17i4.13913","DOIUrl":"https://doi.org/10.18502/ijhoscr.v17i4.13913","url":null,"abstract":"Background: The level of adherence to drug therapy after allogeneic hematopoietic stem-cell transplantation (Allo-HSCT) can affect the patient’s outcome, and poor adherence is one of the factors in first-year mortality after HSCT.&#x0D; Material and Methods: This study assessed adherence to cyclosporine and prednisolone as the immunosuppressant regimen in 110 post-HSCT patients (> 18 years). Demographic characteristics, clinical information, and cyclosporine levels were obtained. A validated Persian medication adherence scale was used to assess adherence to cyclosporine and prednisolone.&#x0D; Results: For 110 patients, the calculated mean of the total score of cyclosporine and prednisolone was 7.73 ± 0.62 and 7.63 ± 0.73, respectively. Poor adherence to medication in this population was 27.7% and 22.7% to prednisolone and cyclosporine, respectively. A significant correlation was observed between adherence total score and cyclosporine levels at the third- and fourth-month post-transplant (r = 0.52, P < 0.001 and r = 0.60, P = 0.001). In the first, second, and third months, the mean of cyclosporine levels in the high adherence level was higher than the moderate and poor adherence levels. Additionally, there was an association between adherence score and the level of cyclosporine. One score increase in adherence scale on average increased cyclosporine level by 34.48 ng/ml.&#x0D; Conclusion: In this study, medication non-adherence was high, which indicates the need for more careful monitoring of post-HSCT patients’ medication use. This is even more crucial currently since it has been confirmed that adherence can affect cyclosporine levels as the most effective immunosuppressant agent in preventing graft-versus-host disease (GVHD).","PeriodicalId":94048,"journal":{"name":"International journal of hematology-oncology and stem cell research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135781006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Association of High Serum Leptin Level with Papillary Thyroid Carcinoma: A Case-Control Study.","authors":"Roya Refahi,&nbsp;Zahra Heidari,&nbsp;Mohammadali Mashhadi","doi":"10.18502/ijhoscr.v17i3.13311","DOIUrl":"https://doi.org/10.18502/ijhoscr.v17i3.13311","url":null,"abstract":"<p><p><b>Background:</b> Recently, the prevalence of thyroid cancer has increased. Although there are known risk factors for thyroid cancer, none of them can justify this recent increase. In addition to the known risk factors, other risk factors have been proposed. Leptin can be considered as one of these risk factors due to the recent increase in the prevalence of obesity in the population. Leptin is a common factor in obesity and thyroid cancer. Leptin exerts anti-apoptotic and mitogenic effects on cancer cells and also acts as an angiogenic factor. This study aimed to evaluate the serum leptin level in individuals who suffer from papillary thyroid carcinoma (PTC), cases with benign thyroid nodules (BTN), and a healthy group. <b>Materials and Methods:</b> In this study, newly diagnosed patients with PTC, BTNs, as well as euthyroid healthy control subjects without nodules were included. In all these participants, various clinical and laboratory parameters including thyroid function tests and serum leptin levels were measured and compared between the three study groups. For patients with PTC, leptin was assessed 12 weeks after total thyroidectomy. <b>Results:</b> Ninety-one cases with PTC, 90 cases with BTNs, and 88 controls were recruited. Serum leptin levels in the PTC group, benign group, and the control group were 22.34, 17.60, and 13.83 ng/ml, respectively, which was considerably higher in PTC cases compared to those with benign nodules and control group (P<0.001). There was a significant association between leptin with BMI, tumor size, and tumor stage in PTC patients. Also, in patients with BTNs, a correlation between BMI, tumor size, and leptin was observed. <b>Conclusion:</b> Serum leptin levels were considerably higher in cases with PTC than those with BTNs and controls and can be considered as a potential tumor marker for papillary thyroid cancer.</p>","PeriodicalId":94048,"journal":{"name":"International journal of hematology-oncology and stem cell research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/ff/76/IJHOSCR-17-210.PMC10560642.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pernicious Anemia Following COVID-19 Vaccination: A Report of Two Cases.","authors":"Hamidreza Soltani,&nbsp;Saeb Taghizade,&nbsp;Abdolrahim Sadeghi,&nbsp;Ali Farahat,&nbsp;Mohammad Bagher Owlia","doi":"10.18502/ijhoscr.v17i3.13312","DOIUrl":"10.18502/ijhoscr.v17i3.13312","url":null,"abstract":"<p><p>Since December 2019 and the global epidemic of COVID-19 different countries have focused on vaccines, and one of the inactivated produced vaccines was the Sinopharm COVID-19 vaccine. Some side effects of this vaccine were reported previously, including pain at the vaccination site, fatigue, lethargy, headache, and tenderness, which were more prevalent among individuals <49 years old. Herein, we reported two patients aged 45 and 51 years old. Both patients have different signs and symptoms after receiving the second dose of the vaccine. None had a history of chronic disease. On examination and following labs and other diagnostic investigations, we found megaloblastic anemia due to atrophic gastritis and low intrinsic factor. These cases showed an autoimmune side effect of the Sinopharm COVID-19 vaccine that was previously reported with an exact mechanism but other features called Covid Arm, Guillain-Barré syndrome, and thrombocytopenia. The mechanism of this reaction is unclear yet.</p>","PeriodicalId":94048,"journal":{"name":"International journal of hematology-oncology and stem cell research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/25/c0/IJHOSCR-17-220.PMC10560650.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Blood Products Utilization Status in Off-Pump Cardiac Surgery Patients.","authors":"Azita Chegini, Mastaneh Alaei, Afsaneh Jahangiryan, Maryam Zadsar","doi":"10.18502/ijhoscr.v17i3.13310","DOIUrl":"10.18502/ijhoscr.v17i3.13310","url":null,"abstract":"<p><p><b>Background:</b> Transfusion support has an essential role in coronary artery bypass graft (CABG). The time-honored gold standard for CABG is the on-pump procedure (ONCAB); however, off-pump coronary artery bypass (OPCAB) is also a safe, cost-benefit procedure with fewer blood transfusion requirements. This study was performed to evaluate transfusion patterns in OPCAB due to the diversity of transfusion practices. <b>Materials and Methods:</b> This retrospective study was performed to determine the transfusion rate and triggers in OPCAB patients. Medical files of all patients undergoing OPCAB surgery at Sanandaj Tohid Hospital in 2014 were reviewed. Patients' demographics data, preoperative laboratory tests (PT, aPTT, Hb, Hct, Platelet count), underlying medical conditions, and their possible relation to further transfusions and the ward department in which the transfusion had taken place were extracted. SPSS 16 Chicago software, T-student Test, One Way Anova, and χ2 exam were applied for data analysis. P values ≤0.05was considered significant. <b>Results:</b> Among 91 elective OPCAB patients: 28(30.8%) women and 63(69.2%) men with mean age of 64.80±9.02 years, 63(69.23%) received a blood product. Mean utilization of PRBC, FFP, Platelet, and Cryoprecipitate were 2.17±2.044, 2.46±2.86, 2.86±3.80 and 0.40±2.10 units, respectively. ICU revealed the highest consumption rate for all products.  Female sex (p<0.001), Hypertension (P=0.002), and low hemoglobin(P=0.004) were noted as predictive factors for transfusion.  <b>Conclusion:</b> This study concluded that the transfusion rate in OPCAB is still very high in Iran (regarding a study in a countryside hospital) and that the highest utilization rate is seen in the ICU.</p>","PeriodicalId":94048,"journal":{"name":"International journal of hematology-oncology and stem cell research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/78/ae/IJHOSCR-17-200.PMC10560645.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of the Persian Gulf Jellyfish (Cassiopea andromeda) Venom on the Expression of P15, P21, P53, DNMT1, and Bcl-2 in Acute Lymphoblastic Leukemia Jurkat Cells.","authors":"Reza Dehghani,&nbsp;Ali Amrooni,&nbsp;Fatemeh Hosseinpour-Soleimani,&nbsp;Gholamhossein Mohebbi,&nbsp;Narges Obeidi","doi":"10.18502/ijhoscr.v17i3.13307","DOIUrl":"10.18502/ijhoscr.v17i3.13307","url":null,"abstract":"<p><p><b>Background:</b> One of the acute hematologic malignancies is acute lymphoblastic leukemia (ALL), which is formed in B or T lymphocyte stem cells. Regarding the increasing tendency to herbal and marine studies and unclear characteristics of Cassiopea andromeda Venom, this study was performed to determine its effects on Jurkat cells as a model for T-ALL. <b>Materials and Methods:</b> In this experimental study, the cells were treated with a variety of concentrations of Cassiopea andromeda venom at different periods and times. Growth inhibition and toxic effects of Cassiopea andromeda Venom were evaluated by methyl thiazole tetrazolium salt reduction (MTT test). The flow cytometry analysis was carried out using 7-aminoactinomycin D (7AAD) and Annexin V stains to evaluate the venom's effect on apoptotic pathways. Besides, Real-Time PCR was performed to evaluate the relative gene expression. <b>Results:</b> Cassiopea andromeda venom inhibited the growth of Jurkat cells in a concentration and time manner. Jurkat cell growth was inhibited by 48.9% after 72 hours of treatment with 250µg/mL Cassiopea andromeda venom. The venom increased the apoptotic process through the upregulation of p15INK4b and P53 proteins and downregulation of Bcl-2, p21 ^WAF1/CIP1, and DNMT1 in the Jurkat cell line. <b>Conclusion:</b> Considering the growth inhibitory property of Cassiopea andromeda Venom, we recommend it as a part of combinational medication for treating ALL in animal trials and for other leukemias in vitro studies.</p>","PeriodicalId":94048,"journal":{"name":"International journal of hematology-oncology and stem cell research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/4c/5d/IJHOSCR-17-177.PMC10560648.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of Standard Operating Procedures (SOPs) Preparing Hygienic Condition in the Blood Donation Centers during the Outbreak of COVID-19.","authors":"Saeed Mohammadi,&nbsp;Seyed Morteza Tabatabaei Yazdi,&nbsp;Sahar Balagholi,&nbsp;Saeid Saremi,&nbsp;Rasul Dabbaghi,&nbsp;Shirin Ferdowsi,&nbsp;Peyman Eshghi","doi":"10.18502/ijhoscr.v17i3.13306","DOIUrl":"10.18502/ijhoscr.v17i3.13306","url":null,"abstract":"<p><p><b>Background:</b> The coronavirus disease 2019 (COVID-19) outbreak has led to an alteration in hygienic conditions. In this situation, improving standard operating procedures (SOPs) in blood donation centers is critical. The purpose of this study was the assessment of SOPs in the blood donation centers during the outbreak of COVID-19 by regular blood donors as external audits. <b>Materials and Methods:</b> Regular donors were selected as external inspectors in 31 provinces of Iran. The questionnaire containing 10 closed questions was provided to assess the hygienic SOPs of blood transfusion centers in the prevention of COVID-19 transmission. Comparison and evaluation of questionnaires were conducted by assigning an importance coefficient (IC) score to each question. <b>Results:</b> Assessment of SOPs in blood donation departments by regular donors in 31 provinces of Iran showed that 18 centers (58.1%) received IC scores >10(Strong performance), seven centers (22.6%) received the range of IC scores between7-10(acceptable performance), and six centers (19.4%) received IC scores <7(poor performance). The difference in IC scores between provinces was not statistically significant. <b>Conclusion:</b> This study confirms that the assessment of blood donation centers through regular blood donor inspection is a reliable method to identify the strengths and weaknesses of blood transfusion center services and ultimately leads to corrective intervention and improvement of hygienic SOPs to prevent COVID-19 transmission.</p>","PeriodicalId":94048,"journal":{"name":"International journal of hematology-oncology and stem cell research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/dc/60/IJHOSCR-17-167.PMC10560646.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clinical Features and Risk Factors of Relapse and Mortality in Thrombotic Thrombocytopenic Purpura Patients: A Seven-Year Experience.","authors":"Sahar Tavakoli Shiraji,&nbsp;Mohammad Reza Rostami,&nbsp;Hosein Kamranzadeh Foumani,&nbsp;Seied Asadollah Mousavi,&nbsp;Mohammad Vaezi,&nbsp;Soroush Rad,&nbsp;Davood Babakhani,&nbsp;Maryam Barkhordar,&nbsp;Tanaz Bahri,&nbsp;Ghasem Janbabaei,&nbsp;Ashraf Malekmohammadi,&nbsp;Saeed Mohammadi,&nbsp;Vahid Mansouri","doi":"10.18502/ijhoscr.v17i3.13305","DOIUrl":"10.18502/ijhoscr.v17i3.13305","url":null,"abstract":"<p><p><b>Background</b>: Thrombotic thrombocytopenic purpura (TTP) is associated with microangiopathic hemolytic anemia, thrombocytopenia, and microvascular thrombosis. No comprehensive report exists on clinical characteristics and risk factors of relapse and mortality in Iranian TTP patients. In this study, we aimed to report clinical features of Iranian TTP patients, to evaluate disease relapse and mortality rate and their associated risk factors. <b>Materials and Methods</b>: This study was a cohort study of patients diagnosed with microangiopathic hemolytic anemia admitted to the Shariati Hospital, Tehran, a referral center for TTP patients, from 2010 to 2017. Demographic, clinical, and laboratory data were recorded and patients were followed for 3 years regarding disease relapse and mortality. <b>Results</b>:  114 patients (80 females, 34 males) with a mean age of 39.3 ± 14.99 years were included.  Hematologic and neurologic symptoms were the most common manifestations. Abnormal laboratory findings at the presentation included thrombocytopenia, anemia, and elevated LDH. All patients were treated with plasma exchange, and 75.5% of them had a response to treatment, while the 3-year relapse and mortality rate was 23.6 and 26.3%.  Lower platelet count was a predictor of disease relapse. Age, hematological, or neurological initial presentation were associated with TTP mortality. <b>Conclusion</b>: Based on the largest study of TTP patients ever in Iran, the demographic and clinical characteristics of Iranian TTP patients are similar to other existing reports. Knowledge of the risk factors for TTP relapse and mortality could be useful to alert hematologists for prompt therapeutic actions when necessary.</p>","PeriodicalId":94048,"journal":{"name":"International journal of hematology-oncology and stem cell research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/d0/98/IJHOSCR-17-156.PMC10560647.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}