CL_III_L: Clinical Medicine III. Lectures
Petra Kövy1,2, Zoltán Őrfi2, András Bors2, András Kozma2, László Gopcsa3, János Dolgos3, Nóra Lovas3, József Harasztdombi3, Viktor Lakatos3, Ágnes Király3, Gábor Mikala3, István Vályi-Nagy3, Péter Reményi3, Hajnalka Andrikovics2
1School of PhD Studies Rácz Károly, Semmelweis University, Budapest
2Laboratory of Molecular Genetics, Central Hospital of Southern Pest National Institute of Hematology and Infectious Diseases, Budapest
3Department of Hematology and Stem Cell Transplantation, Central Hospital of Southern Pest National Institute of Hematology and Infectious Diseases, Budapest
Introduction: Monitoring measurable residual disease (MRD) in acute myeloid leukemia (AML) plays an important role in predicting relapse and outcome. The applicability of the leukemia-initiating nucleophosmin1 (NPM1) gene mutations in MRD detection is well-established, while that of isocitrate dehydrogenase1/2 (IDH1/2) mutations are matter of debate.
Aims: The aim of this study was to investigate the stability of NPM1 and IDH1/2 mutations at diagnosis and relapse retrospectively in 916 adult AML patients.
Methods: The prognostic value of MRD was evaluated by droplet digital PCR on the DNA level in a selected subgroup of patients in remission.
Result: NPM1 re-emerged at relapse in 91% (72/79), while IDH1/2 in 87% (20/23) of mutation-positive cases at diagnosis. NPM1 mutation did not develop at relapse, on the contrary novel IDH1/2 mutations occurred in 3% (3/93) of previously mutation-negative cases. NPM1 MRD-positivity after induction (n=116) proved to be an independent, adverse risk factor (MRDpos 24-month OS: 39.3±6.2% versus MRDneg: 58.5±7.5%, p=0.029; HR: 2.16; 95%CI: 1.25-3.74, p=0.006). In the favorable subgroup of mutated NPM1 without fms-like tyrosine kinase 3 internal tandem duplication (FLT3-ITD) or with low allelic ratio, NPM1 MRD provides a valuable prognostic biomarker (NPM1 MRDpos versus MRDneg 24-month OS: 42.9±6.7% versus 66.7±8.6%; p=0.01). IDH1/2 MRD-positivity after induction (n=62) was also associated with poor survival (MRDpos 24-month OS: 41.3±9.2% versus MRDneg: 62.5±9.0%, p=0.003; HR 2.81 95%CI 1.09-7.23, p=0.032). While NPM1 variant allele frequency decreased below 2.5% in remission in all patients, IDH1/2 mutations (typically IDH2 R140Q) persisted in 24% of cases.
Conclusion: Our results support that NPM1 MRD even at DNA level is a reliable prognostic factor, while IDH1/2 mutations may represent pre-leukemic, founder or subclonal drivers.
Funding: The study was supported by the ÚNKP-20-3-II-SE-79 New National Excellence Program of the Ministry for Innovation and Technology from the Source of the National Research, Development and Innovation Fund.
Semmelweis University, Károly Rácz Doctoral School of Clinical Medicine