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Minimal Residual Disease (MRD)

Quantification of CBFβ/MYH11 fusion transcript by Real Time RT-PCR in patients with INV(16) acute myeloid leukemia

Abstract

Amplification of the CBFβ/MYH11 fusion transcript by a qualitative reverse transcription-polymerase chain reaction (RT-PCR) has been used to detect minimal residual disease (MRD) and assess the risk for disease relapse in inv(16)(p13q22) acute myeloid leukemia (AML). This strategy has, however, produced conflicting results and because of an uncertain predictive value, its use in the clinical setting cannot be recommended. The objective of the current study was to evaluate if quantification by Real Time RT-PCR could be useful to determine levels of CBFβ/MYH11 fusion transcripts predictive of clinical outcome in inv(16)(p13q22) AML at diagnosis or during remission. Bone marrow (BM) samples from 16 patients with inv(16) AML enrolled on a German multicenter trial (AML HD93) were analyzed for levels of CBFβ/MYH11 fusion transcripts by Real Time RT-PCR at diagnosis (n = 14), during remission (n = 10) and at relapse (n = 6). The CBFβ/MYH11 transcript copy number in each sample was normalized to copies of an internal control housekeeping transcript (ie 18S). The copy number measured at diagnosis or relapse were 3 to 4 log higher that those measured during remission, following completion of induction treatment. A high CBFβ/MYH11transcript copy number at diagnosis had a significant correlation with a high percentage of BM blasts (Spearman's coefficient = −0.66; P = 0.03), and a borderline correlation with a short complete remission (CR) duration (Spearman's coefficient = −0.51; P = 0.07). No difference in levels of CBFβ/MYH11 fusion transcripts measured during intensification therapy was found between patients destined to relapse and those who continued in CCR (P = 0.75). Following completion of the entire chemotherapy program, patients that during CR showed a CBFβ/MYH11 fusion transcript copy number >10 had a significantly shorter CR duration (P = 0.002) and higher risk for disease relapse (P = 0.05) than patients with a CBFβ/MYH11fusion transcript copy number <10. The results of the current study, therefore, suggest that it is possible to determine in remission samples a threshold of CBFβ/MYH11 transcript copy number above which relapse occurs and below which continuous CR is likely.

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Acknowledgements

This work was supported in part by grant P30CA16058, National Cancer Institute, Bethesda, MD, The Coleman Leukemia Research Foundation and The American Cancer Society IRG-98–278–01 grant.

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Marcucci, G., Caligiuri, M., Döhner, H. et al. Quantification of CBFβ/MYH11 fusion transcript by Real Time RT-PCR in patients with INV(16) acute myeloid leukemia. Leukemia 15, 1072–1080 (2001). https://doi.org/10.1038/sj.leu.2402159

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