TY - JOUR
T1 - Myd88l265p detection in igm monoclonal gammopathies
T2 - Methodological considerations for routine implementation
AU - Ferrante, Martina
AU - Furlan, Daniela
AU - Zibellini, Silvia
AU - Borriero, Michela
AU - Candido, Chiara
AU - Sahnane, Nora
AU - Uccella, Silvia
AU - Genuardi, Elisa
AU - Alessandria, Beatrice
AU - Bianchi, Benedetta
AU - Mora, Barbara
AU - Grimaldi, Daniele
AU - Defrancesco, Irene
AU - Jiménez, Cristina
AU - Cavallo, Federica
AU - Ferrero, Dario
AU - Dogliotti, Irene
AU - Merli, Michele
AU - Varettoni, Marzia
AU - Ferrero, Simone
AU - Drandi, Daniela
N1 - Funding Information:
Funding: This research was supported by: a grant from the International Waldenstrom’s Macroglobulinemia Foundation and the Leukemia & Lymphoma Society, Fondi di Ricerca Locale, Università degli Studi di Torino, Italy; Fondazione CRT (projects code: 2018.1284), Torino, Italy; Damiano per l’Ematologia (C.F. 91062500557).
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/5
Y1 - 2021/5
N2 - In IgM monoclonal gammopathies MYD88L265P is a prognostic and predictive biomarker of therapy response. MYD88L265P detection is mainly performed by allele-specific quantitative PCR (ASqPCR), however recently, droplet digital PCR (ddPCR) has been proved to be suitable for MYD88L265P screening and minimal residual disease monitoring (MRD). This study compared ASqPCR and ddPCR to define the most sensitive method for MYD88L265P detection in bone marrow (BM), peripheral blood (PB) sorted or unsorted CD19+ cells, and in plasma cell-free DNA (cfDNA). Overall, the analysis showed a good concordance rate (74%) between the two methods, especially in BM samples, while discordances (26%) were mostly in favor of ddPCR (ddPCR+ vs. ASqPCR-) and were particularly evident in samples with low mutational burden, such as PB and cfDNA. This study highlights ddPCR as a feasible approach for MYD88L265P detection across different specimen types (including cfDNA). Interestingly, its high sensitivity makes CD19+ selection dispensable. On the other hand, our results showed that MYD88L265P detection on PB samples, especially with ASqPCR, is suboptimal for screening and MRD analysis. Finally, significantly different MYD88L265P mutational levels observed between Waldenström Macroglobulinemia and IgM monoclonal gammopathy of undetermined significance patients suggest the need for further studies in order to identify possible correlations between mutational levels and risk of progression to Waldenström.
AB - In IgM monoclonal gammopathies MYD88L265P is a prognostic and predictive biomarker of therapy response. MYD88L265P detection is mainly performed by allele-specific quantitative PCR (ASqPCR), however recently, droplet digital PCR (ddPCR) has been proved to be suitable for MYD88L265P screening and minimal residual disease monitoring (MRD). This study compared ASqPCR and ddPCR to define the most sensitive method for MYD88L265P detection in bone marrow (BM), peripheral blood (PB) sorted or unsorted CD19+ cells, and in plasma cell-free DNA (cfDNA). Overall, the analysis showed a good concordance rate (74%) between the two methods, especially in BM samples, while discordances (26%) were mostly in favor of ddPCR (ddPCR+ vs. ASqPCR-) and were particularly evident in samples with low mutational burden, such as PB and cfDNA. This study highlights ddPCR as a feasible approach for MYD88L265P detection across different specimen types (including cfDNA). Interestingly, its high sensitivity makes CD19+ selection dispensable. On the other hand, our results showed that MYD88L265P detection on PB samples, especially with ASqPCR, is suboptimal for screening and MRD analysis. Finally, significantly different MYD88L265P mutational levels observed between Waldenström Macroglobulinemia and IgM monoclonal gammopathy of undetermined significance patients suggest the need for further studies in order to identify possible correlations between mutational levels and risk of progression to Waldenström.
KW - ASqPCR
KW - DdPCR
KW - IgM-MGUS
KW - MYD88
KW - WM
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U2 - 10.3390/diagnostics11050779
DO - 10.3390/diagnostics11050779
M3 - Article
AN - SCOPUS:85106507402
VL - 11
JO - Diagnostics
JF - Diagnostics
SN - 2075-4418
IS - 5
M1 - 779
ER -