The precise function of the DLK1 protein is unclear, but DLK1 expression is upregulated in myelodysplastic syndrome, a slowly progressing haematological malignancy, and in uterine leiomyomata (compared to normal myometrium) (Miyazato et al, 2001; Tsibris et al, 2002). This evidence concerns the gene DLK1 and myelodysplastic syndrome.