The result showed that at the three time points (4th day, 7th day, and 10th day), the level of IL-6 in cultured supernatants of BMSC from the anemia group was significantly higher than that of the normal group, which indicated that the IL-6 secretion level may be enhanced to some extent by the induction of aplastic anemia caused by irradiation and chemotherapeutic drugs. This evidence concerns the gene IL6 and anemia (phenotype).