In CML, f-circRNA circBA9.3, which results from a juxtaposition of ABL1 exon 3 to BCR exon 9, was detected in peripheral blood cells from patients with CML harboring the t(9;22) (q34;q11) translocation that results in the BCR/ABL1 fusion gene. Here, ABL1 is linked to chronic myelogenous leukemia, BCR-ABL1 positive.