Examples of the MRD course. Examples of the MRD course measured by Ig/TCR (dashed line), BCR-ABL1 genomic breakpoint (full line), and IKZF1 deletion (dotted line) quantification in 2 illustrative patients with concordant MRD (A) and 2 with discordant MRD (B). The gray area represents the level of sensitivity of the Ig/TCR quantification. M, month (from the start of treatment or from SCT).