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A low thrombospondin-1 serum concentration is related to increased bacteremia risk in lymphoma patients treated with BeEAM/BEAM conditioning regimen and autologous stem cell transplantation.
Infectious complications of autologous hematopoietic stem cell transplantation (AHSCT) are the most common adverse effects of the therapy, resulting in prolonged hospitalization and deterioration of patient well-being. Identifying predictors of these complications is essential for improving patient outcomes and guiding clinical management. This study aimed to examine thrombospondin-1 (THBS-1) serum levels as a potential biomarker for predicting bacteremia in AHSCT recipients. Blood samples were collected from 30 patients undergoing BeEAM/BEAM (bendamustine/carmustine, etoposide, cytarabine, melphalan) conditioning regimen at subsequent time points during AHSCT. THBS-1 levels were quantified using ELISA kits. Patients who developed bacteremia (n = 11) during the AHSCT course had lower THBS-1 concentration compared with those without (n = 19) (22.88 ± 11.53 µg/mL vs. 15.24 ± 5.62 µg/mL, p = .0325). The ROC curve analysis revealed that THBS-1 serum concentration at the first day of BeEAM/BEAM regimen had an area under the curve of 0.732 (95%CI: 0.5390.925, p = .0186) with an optimal cut-off value of 16.5 µg/ml resulting in 82% Sensitivity and 53% Specificity for predicting bacteremia with a median of 11 days before its occurrence. Patients with lower THBS-1 concentrations experienced febrile neutropenia significantly earlier, with a median difference of 5 days (p = .0037). Patients with a low concentration of THBS-1 had a higher risk of bacteremia and a shorter time to febrile neutropenia, indicating its potential value as a complications biomarker. Patients with lower serum THBS-1 concentrations, indicating an increased risk, may be more suitable for an inpatient AHSCT procedure, where close monitoring and immediate intervention are accessible.
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