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Relapse free survival according to multilocus genetic risk score (MGRS). Compared with those with a low MGRS (≤3), ALL children with a high MGRS (≥4) presented a significantly increased risk of relapse (HR = 2.06; 95% CI = 1.01, 4.21; log rank P value = 0.042). 
, multilocus genetic risk score <=3; 
, multilocus genetic risk score >=4
