Table 5

Kinetics of JAK2V617F during blast phase transition

MPN statusMPN diagnosisChronic phase BM blasts, %Chronic phase JAK2V617F, %Blast phase BM blasts, %Blast phase JAK2V617F, %Postblast phase JAK2V617F, %
JAK2V617F negative       
    UPN 2 PMF 10  
    UPN 4 PMF    
    UPN 15 PMF 24  
    UPN 29 PMF    
    UPN 34 PMF 35  
    UPN 36 PMF 14    
    UPN 64 MPN-U 35  
    UPN 72 MPN-U    
JAK2V617F positive       
    UPN 1 PMF 62 30 46  
    UPN 3 SMF(ET) 35 15 12  
    UPN 16 PMF 10 67* 25 80*  
    UPN 32 PMF 78 20 78 59 (in CR1), 0 (after SCT) 
    UPN 33 PMF 45* 20 46 45 (in CR1), 0 (after SCT) 
    UPN 52 PV 75 64 21  
    UPN 54 PV 22 60  
    UPN 56 PV 100 21 43  
    UPN 65 MPN-U 11 15 69  
    UPN 67 MPN-U 13 15  
    UPN 71 SMF(ET) 67 38 11 6 (in CR1), NT (after SCT) 
    UPN 73 PMF 14 27 63  
JAK2V617F unknown       
    UPN 5 PMF   71  
    UPN 7 PMF   21  
    UPN 8 PMF   32 0 (after SCT) 
    UPN 9 PMF   22 71 0 (after SCT), 65 (at relapse), NT (in CR2) 
    UPN 17 PMF   20  
    UPN 19 PMF   66  
    UPN 27 PMF   39  
    UPN 28 PMF   44 0*  
    UPN 39 PV   29  
    UPN 42 PV   66 80  
    UPN 50 PV   18 98  
    UPN 53 PV   34 33  
    UPN 55 PV   26 83  
    UPN 57 ET   89 44  
    UPN 59 ET   34 61  
    UPN 60 ET   39  
    UPN 61 ET   33  
    UPN 62 ET   54  
    UPN 63 ET   85  
    UPN 66 MPN-U   31  
    UPN 70 SMF(ET)   34  
MPN statusMPN diagnosisChronic phase BM blasts, %Chronic phase JAK2V617F, %Blast phase BM blasts, %Blast phase JAK2V617F, %Postblast phase JAK2V617F, %
JAK2V617F negative       
    UPN 2 PMF 10  
    UPN 4 PMF    
    UPN 15 PMF 24  
    UPN 29 PMF    
    UPN 34 PMF 35  
    UPN 36 PMF 14    
    UPN 64 MPN-U 35  
    UPN 72 MPN-U    
JAK2V617F positive       
    UPN 1 PMF 62 30 46  
    UPN 3 SMF(ET) 35 15 12  
    UPN 16 PMF 10 67* 25 80*  
    UPN 32 PMF 78 20 78 59 (in CR1), 0 (after SCT) 
    UPN 33 PMF 45* 20 46 45 (in CR1), 0 (after SCT) 
    UPN 52 PV 75 64 21  
    UPN 54 PV 22 60  
    UPN 56 PV 100 21 43  
    UPN 65 MPN-U 11 15 69  
    UPN 67 MPN-U 13 15  
    UPN 71 SMF(ET) 67 38 11 6 (in CR1), NT (after SCT) 
    UPN 73 PMF 14 27 63  
JAK2V617F unknown       
    UPN 5 PMF   71  
    UPN 7 PMF   21  
    UPN 8 PMF   32 0 (after SCT) 
    UPN 9 PMF   22 71 0 (after SCT), 65 (at relapse), NT (in CR2) 
    UPN 17 PMF   20  
    UPN 19 PMF   66  
    UPN 27 PMF   39  
    UPN 28 PMF   44 0*  
    UPN 39 PV   29  
    UPN 42 PV   66 80  
    UPN 50 PV   18 98  
    UPN 53 PV   34 33  
    UPN 55 PV   26 83  
    UPN 57 ET   89 44  
    UPN 59 ET   34 61  
    UPN 60 ET   39  
    UPN 61 ET   33  
    UPN 62 ET   54  
    UPN 63 ET   85  
    UPN 66 MPN-U   31  
    UPN 70 SMF(ET)   34  

JAK2V617F mutant allele frequencies were available in both chronic and blast phase in 16 patients. Patients with less than 20% bone marrow (BM) blasts had the diagnosis of blast phase established on peripheral blood.

MPN indicates myeloproliferative neoplasm; MPN-U, MPN unclassifiable; PMF, primary myelofibrosis; PV, polycythemia vera; ET, essential thrombocythemia; SMF(ET), secondary myelofibrosis evolving from ET; SCT, stem cell transplantation; CR, complete remission with or without blood recovery; and NT, not tested.

*

Results were obtained from peripheral blood specimens.

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