“…As disease flares have been reported during G-CSF treatment in patients with multiple sclerosis, rheumatoid arthritis, and systemic lupus erythematosus [ 34 , 35 , 36 ], cyclophosphamide with a dose of 2–4 g/m 2 is applied before G-CSF treatment with 5–10 µg/kg [ 27 , 35 ]. This regime was also used in the reported trials of autologous HSCT for CD [ 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ]. To avoid combined immunosuppression, immunomodulators and biologics for the treatment of CD should be discontinued as early as possible before cyclophosphamide application to reduce the risk of infections and to prevent interference with PBSC mobilization.…”