[Chronic myelogenous leukemia expressing two bcr-abl chimeric mRNA; a case report].

Chronic myelogenous leukemia (CML) expresses two types of bcr-abl chimeric mRNA. One is b3a2 type in which bcr exon 3 binds to abl exon 2, the other is b2a2 type that bcr exon 2 binds to abl exon 2. Either bcr-abl is normally expressed, but both types of bcr-abl mRNA can be expressed at the same time in a patient. We report here a rare case of CML expressing two types of bcr-abl mRNA and discuss the possibility that this double expression would help to monitor the clinical course of CML.