TK1 and myelodysplastic syndrome: Similarly, the TK1 activity levels in sub groups were also significantly higher in MM (n = 12; mean ± SD = 2.4±1.6 and median = 2.1 pmol/min/mL), CLL (n = 48; mean ± SD = 2.7±1.7 and median = 2.2 pmol/min/mL), MDS (n = 16; mean ± SD = 6.1±15.7 and median = 1.70 pmol/min/mL) and AML (n = 12; mean ± SD = 33.5±55.7 and median = 4.60 pmol/min/mL) compared to blood donors as shown Fig 6D.