As the majority of IFN-α treated patients had a distinct clonal rearrangement detected with the same primer pair Vg2-Jg1.2 in the γδ+ T-cell populations and as it has previously been described that this primer pair recognizes Vδ2Jγ9 T-cells [27], we wanted to analyze the proportion of Vγ9+ cells in CML (n = 9) and MPN (n = 3) patients and in healthy controls (n = 5). Here, IFNA1 is linked to myeloproliferative disorder.