“…This is attributed to the hematopoiesis of the recipient's native CD34+ derived cells despite the cytoreductive treatment prior to the allograft transplant. Several studies have shown strong positive correlation between the extent of mixed chimerism and the likelihood of patient hematologic relapse [4,[6][7][8][9]. The magnitude of mixed chimerism is frequently measured using PCR-based methods [10,11] as a ratio of the recipient genotype signal to that of the donor.…”