Evaluation of Low-Dose Liposomal Amphotericin B for Prophylaxis of Invasive Fungal Infections in Patients With Prolonged Neutropenia: A Clinical Study
This is a single-center, single-arm, observational clinical study evaluating the efficacy and safety of low-dose liposomal amphotericin B (50 mg/day, intravenous, once daily) for the prevention of invasive fungal infections in adult patients (aged 18-75 years) with hematological malignancies who develop prolonged neutropenia (absolute neutrophil count ≤0.5×10\^9/L, expected to last \>7 days) and are at high risk for invasive fungal disease. Participants are those who, per the treating physician's routine clinical decision, have been initiated on liposomal amphotericin B prophylaxis at 50 mg/day due to intolerance or toxicity to other antifungal agents. The primary outcome is the incidence of proven or probable invasive fungal disease. Secondary outcomes include incidence of pneumonia, persistent unexplained fever \>4 days, use of additional systemic antifungal therapy, and adverse events. A total of 30 participants will be enrolled. Data will be collected at baseline, during treatment, and within 7 days after treatment completion.
• Age 18 to 75 years (inclusive), both sexes.
• Meets NCCN 2025 V1 guideline criteria for high-risk invasive fungal disease, including allogeneic hematopoietic stem cell transplantation, autologous hematopoietic cell transplantation with mucosal damage, acute leukemia, grade 3/4 graft-versus-host disease, myelodysplastic syndrome, lymphoma, multiple myeloma, chronic lymphocytic leukemia, treatment with purine analogues (fludarabine, clofarabine, nelarabine), chimeric antigen receptor (CAR) T-cell therapy, alemtuzumab therapy, with expected neutropenia \>7 days and accompanied by agranulocytosis.
⁃ Note: Agranulocytosis is defined as absolute neutrophil count ≤0.5×10\^9/L, or absolute neutrophil count ≤1×10\^9/L with expected decline to ≤0.5×10\^9/L within 48 hours.
• Assessed by the study physician as having high-risk for invasive fungal infection, intolerant or unable to use other antifungal agents due to toxicity or other reasons, and the treating physician has independently decided in routine clinical practice to initiate liposomal amphotericin B for antifungal prophylaxis for 3-5 days, with the selected dosage regimen of 50 mg/day, intravenous, once daily.
• Patient or legally authorized representative has voluntarily signed the informed consent form.