Table 2 Sokal, Hasford, and EUTOS Systems[13–15]

Year introduced

Predominant treatment modality

Factors

•Age

•Age

•Spleen size

•Spleen size

•Spleen size

•Basophil count

•Platelet count

•Platelet count

•Percentage of blasts

•Percentage of blasts

•Percentage of basophils

•Percentage of eosinophils

Calculation of score

Exp 0.0116 (age – 43) + 0 .0345 (spleen size [cm below costal margin] – 7.5 cm) + 0.188 [(platelet count/700)² – 0.563] + 0.0887 (% blasts in blood – 2.1)

(0.6666 × age [0 when age <50 years; 1, otherwise] + 0.0420 × spleen size [cm below costal margin] + 0.0584 × blasts [%] + 0.0413 × eosinophils [%] + 0.2039 × basophils [0 when basophils <3%; 1, otherwise] + 1.0956 × platelet count [0 when platelets <1500 × 10⁹/L; 1, otherwise]) × 1000

7 × basophils + 4 × spleen size

Risk groups^a

•High: score > 1.2

•High: score >1480

•High: score > 87

•Intermediate: score 0.8-1.2

•Intermediate: score >780 and ≤1480

•Low: score ≤ 87

•Low: score < 0.8

•Low: score ≤ 780