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Background: Acute kidney injury (AKI) is a common complication of hematopoietic stem cell transplantation (HSCT) with increased mortality and morbidity. Understanding the risk factors for AKI is essential. This study aimed to identify AKI incidence, risk factors, and prognosis in pediatric patients post-HSCT. Methods: We conducted a retrospective case–control study of 278 patients who were divided into two groups: those with AKI and those without AKI (non-AKI). The groups were compared based on the characteristics and clinical symptoms of patients, as well as post-HSCT complications and the use of nephrotoxic drugs. Logistic regression analysis was employed to identify the risk factors for AKI. Results: A total of 16.9% of patients had AKI, with 8.5% requiring kidney replacement therapy. Older age (OR 1.129, 95% CI 1.061–1.200, p < 0.001), sinusoidal obstruction syndrome (OR 2.562, 95% CI 1.216–5.398, p = 0.011), hemorrhagic cystitis (OR 2.703, 95% CI 1.178–6.199, p = 0.016), and nephrotoxic drugs, including calcineurin inhibitors, amikacin, and vancomycin (OR 17.250, 95% CI 2.329–127.742, p < 0.001), were identified as significant independent risk factors for AKI following HSCT. Mortality rate and mortality due to AKI were higher in stage 3 patients than those in stage 1 and 2 AKI (p = 0.019, p = 0.007, respectively). Chronic kidney disease developed in 1 patient (0.4%), who was in stage 1 AKI (2.1%). Conclusions: AKI poses a serious threat to children post-HSCT, leading to alarming rates of mortality and morbidity. To enhance outcomes and mitigate these risks, it is vital to identify AKI risk factors, adopt early preventive strategies, and closely monitor this patient group. [ABSTRACT FROM AUTHOR]

Introduction: Total body irradiation (TBI) with megavolt photon energy is a treatment that can be applied before bone marrow transplantation (BMT) in many hematologic diseases. Two-dimensional TBI (2D-TBI) is one of the oldest RT techniques. We performed a retrospective study to evaluate the radiotherapy (RT)-related acute adverse events in pediatric patients with TBI. Methods: Patients who received TBI between January 1, 2021, and December 30, 2021, in the Radiation Oncology Clinic of Ankara City Hospital were evaluated retrospectively. The primary endpoint of the study was the assessment of RT-related acute adverse events (RT-AE). The Common Terminology Criteria for Adverse Events (CTCAE) version 5.0 was used for RT-AE. Results: Twenty-one pediatric patients treated with 2D-TBI between February 20, 2021, and October 10, 2021, have been retrospectively analyzed. The median follow-up period is 7 (range 1-14) months. The median age of the patients is 11 (range 2-17) years. The median time to BMT following TBI is 4 (range 3-13) days. A total of 12 Gy was applied to 15 (71.4%) patients diagnosed with acute lymphoblastic leukemia and acute myeloid leukemia. A total of 3 Gy was applied to 5 (23.8%) patients due to aplastic anemia and thalassemia major. A total of 4 Gy was applied to 1 (4.8%) patient who had anaplastic large cell lymphoma. In the first week after TBI, all 21 (100%) patients were neutropenic in grade 3 or higher. One day after TBI, there was a 23.4% increase in grade 3 or higher leukopenia [p=0.042; OR (95% CI) 0.278 (0.132-0.585)]. Discussion and Conclusion: The 2D-TBI is applied with acceptable toxicity. TBI-related pneumonia was not observed in any of the patients in our treatment technique with a dose/rate of 0.053 Gy/min. [ABSTRACT FROM AUTHOR]