 The soluble triggering receptor expressed on myeloid cells-1 sTREM-1 was an established biomarker useful for infection in non-neutropenic patients. In this study, we tested sTREM-1 in the patients with neutropenic fever. Pro-calcitonin PCT and C-reactive protein CRP were also measured. We planned to investigate and explore the role of sTREM-1 in early diagnosis of infection in patients with neutropenic fever. 