Low level of minor BCR-ABL1 transcripts can be detected in some CML patients in whom major BCR-ABL1 transcripts are dominantly expressed.[21] Consistent with the previous report,[21] concomitant presence of the minor BCR-ABL1 was detected in 11 of 19 samples (58%) obtained from the CML cases in which major BCR-ABL1 were detected. The gene discussed is ABL1; the disease is chronic myelogenous leukemia, BCR-ABL1 positive.