Neutropenia persisted with the initial treatment due to which the patient was switched to a regimen on ATG/cyclosporine/prednisone. ANC improved to 0.1/mL. G-CSF was added, and the ANC gradually improved to 5.2/mL. Prednisone was tapered down to 5mg by the 19 week which led to neutropenia relapse. Prednisone’s dose was increased, and slower taper was tried by which ANC stabilized. The gene discussed is CSF3; the disease is Decreased total neutrophil count.