Acute and chronic GVHD were similarly graded by established criteria [20, 21]. In patients receiving alemtuzumab, CsA was suspended by day +130. They also received donor lymphocyte infusion (DLI) at a dose of 1 x 107 cluster of differentiation 3 / kg on day +180 in case of active disease, persistence of minimal residual disease detected by flow cytometry or mixed chimerism and no GVHD. In case mixed chimerism, donor lymphocyte infusion was performed if patient hematopoiesis progressively increased. In patients receiving CsA + MTX, CsA was suspended by day +180. These patients received DLI only in situations specified above.