Contribution of multiparameter genetic analysis to the detection of genetic alterations in hematologic neoplasia. An evaluation of combining G-band analysis, spectral karyotyping, and multiplex reverse-transcription polymerase chain reaction (multiplex RT-PCR).

ABSTRACT

We investigated 150 acute myeloid leukemia (AML) patients and 48 acute lymphoblastic leukemia (ALL) patients by multiplex RT-PCR to 7evaluate the adjuvant diagnostic effect, vis-à-vis G-banding and spectral karyotyping (SKY), and the potentials of this method for providing means for monitoring residual disease by real-time quantitative RT-PCR. An abnormal G-banded karyotype was found in 57% of AML and 68% of ALL cases. Ninety-six patients were investigated by SKY in parallel which extended or confirmed the G-banding finding in 94/96 cases. In patients with an abnormal G-banded karyotype, classification of chromosomes involved in structural aberrations by SKY was possible in 98% of the cases and SKY extended the G-banded karyotype in 34% of cases. In 32 cases, an mRNA hybrid was detected by PCR. These cases constitute 16% of the cases investigated at diagnosis (AML 11% and ALL 31%). In 13 of these cases, we detected an mRNA hybrid the equivalent of which was not found by G-banding or SKY (AML 4% and ALL 13%). By including multiplex RT-PCR, we were able to detect abnormalities in 62% of the investigated patients as opposed to 59% by G-banding. Genetic techniques complement each other and selection of relevant and targeted primer kits for the multiplex RT-PCR assay is recommended.