Risk of relapse. Cumulative risk of relapse is shown after conversion to MRD positivity at any level (MRD-pos. at any level; n = 28; median time to relapse, 9.5 months) or after the first time MRD was measurable within the quantitative range of the PCR (MRD-pos. within QR; n = 15; median time to relapse, 4.1 months).