label: Chronic Myeloid Leukemia, Philadelphia Chromosome Negative, BCR-ABL1 Positive
label_lc: chronic myeloid leukemia, philadelphia chromosome negative, bcr-abl1 positive
description: "A chronic myeloid leukemia that does not have the characteristic t(9;22)(q34;q11.2) translocation but it has either a variant translocation or a cryptic translocation that cannot be detected by conventional cytogenetic analysis.  In such cases the BCR-ABL1 fusion gene is always detected by RT-PCR, FISH, or Southern blot analysis."