B-ALL/LBL with ETV6::RUNX1 shows intense expression of CD10 combined with decreased CD9 and CD20 expression [41], B-ALL/LBL associated with KMT2A rearrangements lacks expression of CD10 and CD24, but shows co-expression of myeloid markers CD15 and NG2 [42]. Here, CD9 is linked to acute lymphoblastic leukemia.