The expression of the target set of circRNAs according to BCP-ALL cytogenetic subtype showed circAFF2 was highly expressed in TCF3-PBX1 (p = 0.0252), BCP-ALL, and to a lesser extent in ETV6- RUNX1 BCP-ALL (p = 0.021). This evidence concerns the gene OPN1SW and acute lymphoblastic leukemia.