TK1 and Hodgkins lymphoma: The S-TK1 concentrations were elevated in newly diagnosed HL patients when compared with healthy controls (median 0.32 μg/L vs. 0.24 μg/L, P = 0.003), with a proposed cut-off of 0.45 g/L based on the upper 97.5 percentile limit of the healthy population (Figure 1).