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Integrated flow cytometry and sequencing to reconstruct evolutionary patterns from dysplasia to acute myeloid leukemia

Simoes, Catia; Chillón, María Carmen; Martínez-Cuadrón, David; Calasanz, María José; Vridiales, María Belén; Vazquez, Iria; Ruano, Montserrat; Pérez Simón, José Antonio; Paiva, Bruno

Abstract

Clonal evolution in acute myeloid leukemia (AML) originates long before diagnosis and is a dynamic process that may affect survival. However, it remains uninvestigated during routine diagnostic workups. We hypothesized that the mutational status of bone marrow dysplastic cells and leukemic blasts, analyzed at the onset of AML using integrated multidimensional flow cytometry (MFC) immunophenotyping and fluorescence-activated cell sorting (FACS) with next-generation sequencing (NGS), could reconstruct leukemogenesis. Dysplastic cells were detected by MFC in 285 of 348 (82%) newly diagnosed patients with AML. Presence of dysplasia according to MFC and World Health Organization criteria had no prognostic value in older adults. NGS of dysplastic cells and blasts isolated at diagnosis identified 3 evolutionary patterns: stable (n = 12 of 21), branching (n = 4 of 21), and clonal evolution (n = 5 of 21). In patients achieving complete response (CR), integrated MFC and FACS with NGS showed persistent measurable residual disease (MRD) in phenotypically normal cell types, as well as the acquisition of genetic traits associated with treatment resistance. Furthermore, whole-exome sequencing of dysplastic and leukemic cells at diagnosis and of MRD uncovered different clonal involvement in dysplastic myeloerythropoiesis, leukemic transformation, and chemoresistance. Altogether, we showed that it is possible to reconstruct leukemogenesis in ~80% of patients with newly diagnosed AML, using techniques other than single-cell multiomics.

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Integrated flow cytometry and sequencing to reconstruct evolutionary patterns from dysplasia to acute myeloid leukemia Catia Simoes, 1 Maria-Carmen Chillon, 2 David Martínez-Cuadr´ on, 3 Maria-Jos´ e Calasanz, 1,4 María-Bel´ en Vridiales, 2 Iria Vazquez, 1,4 Montserrat Hern´ andez-Ruano, 2 Be˜ nat Ariceta, 1 Paula Aguirre-Ruiz, 1 Leire Burgos, 1 Diego Alignani, 1 Sarai Sarvide, 1 Sara Villar, 1 Ana Alfonso Pierola, 1 Felipe Prosper, 1 Rosa Ayala, 5 Joaquin Martínez-L ´ opez, 5 Juan Miguel Bergua Burgues, 6 Susana Vives, 7 Jose A. Perez-Simon, 8 Maria Garcia-Fortes, 9 Teresa Bernal del Castillo, 10 Mercedes Colorado, 11 Mayte Olave, 12 Juan I. Rodríguez-Guti´ errez, 13 Jorge Labrador, 14 Marcos Gonz´ alez, 2 Jesús F. San-Miguel, 1 Miguel Ángel Sanz, 3 Pau Montesinos, 3 Bruno Paiva, 1 on behalf of the Programa para Tratamientos en Hematologia (PETHEMA) Cooperative Study Group 1 Departamento de Hemato-Oncology, Clínica Universidad de Navarra, Centro de Investigaci´ on M´ edica Aplicada (CIMA), Instituto de Investigaci´ on Sanitaria de Navarra (IDISNA), Pamplona, Spain; 2 Centro de Investigaci´ on del C´ ancer de Salamanca-IBMCC (USAL-CSIC), Hospital Universitario de Salamanca, IBSAL, Salamanca, Spain; 3 Hospital Universitario y Polit´ ecnico La Fe, Valencia, Spain; 4 Cima Lab Diagnostics, Universidad de Navarra, IDISNA, Pamplona, Spain; 5 Hospital Universitario 12 de Octubre, Universidad Complutense, Madrid, Spain; 6 Hospital San Pedro de Alc´ antara, C´ aceres, Spain; 7 Hospital Germans Trias i Pujol, Badalona, Spain; 8 Hospital Universitario Virgen del Rocio, Seville, Spain; 9 Hospital Universitario Virgen de la Victoria, M´ alaga, Spain; 10 Hospital Central de Asturias, SPA, IUOPA, Oviedo, Spain; 11 Hospital Universitario Marqu´ es de Valdecilla, Cantabria, Spain; 12 Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain; 13 Hospital Universitario de Basurto, Bilbao, Spain; and 14 Hospital Universitario de Burgos, Burgos, Spain Key Points •Targeted sequencing of dysplastic cells and blasts at diagnosis identifies evolutionary patterns from dysplasia to the onset of AML. •Patients with AML may present different clonal involvement in dysplastic myeloerythropoiesis, leukemic transformation, and chemoresistance. Clonal evolution in acute myeloid leukemia (AML) originates long before diagnosis and is a dynamic process that may affect survival. However, it remains uninvestigated during routine diagnostic workups. We hypothesized that the mutational status of bone marrow dysplastic cells and leukemic blasts, analyzed at the onset of AML using integrated multidimensional flow cytometry (MFC) immunophenotyping and fluorescence-activated cell sorting (FACS) with next-generation sequencing (NGS), could reconstruct leukemogenesis. Dysplastic cells were detected by MFC in 285 of 348 (82%) newly diagnosed patients with AML. Presence of dysplasia according to MFC and World Health Organization criteria had no prognostic value in older adults. NGS of dysplastic cells and blasts isolated at diagnosis identified 3 evolutionary patterns: stable (n = 12 of 21), branching (n = 4 of 21), and clonal evolution (n = 5 of 21). In patients achieving complete response (CR), integrated MFC and FACS with NGS showed persistent measurable residual disease (MRD) in phenotypically normal cell types, as well as the acquisition of genetic traits associated with treatment resistance. Furthermore, whole-exome sequencing of dysplastic and leukemic cells at diagnosis and of MRD uncovered different clonal involvement in dysplastic myeloerythropoiesis, leukemic transformation, and chemoresistance. Altogether, we showed that it is possible to reconstruct leukemogenesis in ~80% of patients with newly diagnosed AML, using techniques other than single-cell multiomics. Submitted 19 May 2022; accepted 12 September 2022; prepublished online on Blood Advances First Edition 14 October 2022. https://doi.org/10.1182/ bloodadvances.2022008141. The sequencing data reported in this article have been deposited in the European Genome-phenome Archive database (accession number EGAS00001006318). Data are available on request from the corresponding author, Bruno Paiva (bpaiva@ unav.es). The full-text version of this article contains a data supplement. © 2022 by The American Society of Hematology. Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0), permitting only noncommercial, nonderivative use with attribution. All other rights reserved. REGULAR ARTICLE 10 JANUARY 2023 •VOLUME 7, NUMBER 1 167 Downloaded from http://ashpublications.org/bloodadvances/article-pdf/7/1/167/2027032/blooda_adv-2022-008141-main.pdf by guest on 02 May 2024 Introduction Clonal evolution in acute myeloid leukemia (AML) originates long before diagnosis and is a highly dynamic process that may affect survival. 1 Thus, having the possibility of defining in each patient the genetic events causing AML would be a benefit to routine diagnostic workups. However, dissecting leukemic transformation at the onset of AML is challenging without single-cell sequencing, 2,3 and most clinical laboratories do not have the infrastructure to perform single-cell studies routinely. Patients with newly diagnosed AML may present with dysplasia regardless of their clinical ontogeny (ie, secondary AML [sAML] vs therapy-related vs de novo AML). 4-6 If these residual, mature dysplastic cells were generated before the differentiation blockage of blasts preceding leukemic transformation, it could be hypothesized that studying the mutational profile of dysplastic cells and blasts could uncover the evolutionary process from dysplasia to AML. This hypothesis has never been investigated. Methods We aimed at reconstructing clonal evolution from dysplasia to AML based on the analysis of bone marrow (BM) dysplastic cells and leukemic blasts using integrated multidimensional flow cytometry (MFC) immunophenotyping and fluorescence-activated cell sorting (FACS) with next-generation sequencing (NGS) (Figure 1A). In total, 358 patients with AML were studied after signing informed consent forms approved by the ethics committees, in accordance with the Declaration of Helsinki. The presence of dysplasia according to aberrant phenotypic differentiation of the neutrophil, monocytic, and erythroid lineages was investigated using EuroFlow protocols 7,8 in 348 patients with newly diagnosed AML; 103 were eligible for intensive treatment, whereas 245 were older adults and enrolled in the phase 3 PETHEMA/FLUGAZA trial. 9 Up to 168 cell types from a total of 38 patients with AML were isolated at diagnosis and in complete response for deep-targeted (supplemental Table 1) or exome sequencing. T cells were used as control. A description of methods is available in the supplemental Data. Results and Discussion We first assessed the applicability of our hypothesis by investigating how many patients show dysplasia by MFC at the onset of AML (supplemental Figure 1). Dysplastic cells were observed in 285 of 348 (82%) cases (supplemental Figure 2A). Phenotypic abnormalities were more frequent in neutrophils (45%), followed by monocytic (32%) and erythroid cells (23%) (supplemental Figure 2B). Lack of data on aberrant megakaryocytic differentiation is a limitation of the study. Multilineage dysplasia was detected in 186 (53%) patients. Only 35 (10%) cases had no signs of dysplasia, whereas the remaining 28 (8%) had nearly undetectable hematopoiesis due to massive blast infiltration. The presence of dysplasia was less frequent in patients eligible for intensive chemotherapy vs those ineligible (75% vs 96%, P< .001). Thus, the median age of the series (69 years) may help in explaining presence of dysplastic cells in most patients. In the cohort of older patients enrolled in the PETHEMA/FLUGAZA trial, there were no differences in overall survival between those with or without dysplasia according to MFC (supplemental Figure 2C). The presence of dysplasia assessed by MFC and diagnosis of AML with morphological myelodysplasia-related changes were not significantly associated (supplemental Table 2). Diagnostic classification of AML with myelodysplasiarelated changes vs other subtypes had no impact on overall survival (supplemental Figure 2D). These results in older patients treated with semi-intensive chemotherapy or hypomethylating agents support previous observations in other treatment scenarios of the limited prognostic value of assessing dysplasia in AML. 10,11 Targeted sequencing of dysplastic cells and blasts isolated by FACS in 21 patients with newly diagnosed AML uncovered 3 evolutionary patterns (Figure 1B). Stable evolution in those displaying identical mutational profiles in blasts and dysplastic cells (n = 12 of 21), branching evolution in patients where blasts may have originated from leukemic stem cells other than the ones driving dysplasia due to mutations absent in blasts and present in dysplastic cells (n = 4 of 21), and clonal evolution in cases showing new mutations in blasts onto mutations shared between these and dysplastic cells (n = 5 of 21). These results are not novel but rather consistent with previous observations in whole BM samples sequenced before and after leukemic transformation 4,12 and in FACS stem cell compartments in paired samples from 7 patients progressing from myelodysplastic syndrome to sAML. 13 Furthermore, using single-cell DNA sequencing, Morita et al 3 showed how single-cell data reveal cell-level mutation co-occurrence and enable reconstruction of mutational histories characterized by linear and branching patterns of clonal evolution. Accordingly, targeted sequencing of dysplastic cells and blasts at the onset of AML may help to recreate the history of the disease despite the notably lower resolution of this approach when compared with single-cell DNA sequencing. The unique experimental design of this study yielded interesting observations (Figure 1C). Mutations in the cohesin complex and in transcription factors were never exclusive of dysplastic cells, whereas spliceosome mutations were never exclusive of blasts, which is consistent with their role in sAML. 14,15 Mutations in genes involved in DNA methylation or tumor suppressors were systematically present in dysplastic cells and blasts. At the individual patient level, mutations in TP53 appeared to drive leukemogenesis in patients 1, 2, and 3 (Figure 1B). Conversely, leukemic transformation in patient 18 was associated with a new mutation in STAG2 onto a background of mutated DNMT3A and TP53 in dysplastic and leukemic cells. Other mutations observed exclusively in blasts were found in BCORL1,FLT3-ITD, and PTPN11; all 3 genes are associated with poor prognosis in AML, 16-18 FLT3-ITD is a therapeutic target, 19 and PTPN11 may drive resistance to newer targeted therapies. 20 Of note, subclonal mutations may be missed if whole BM samples are sequenced instead of isolated cell types (supplemental Figure 3). The increased sensitivity in detecting mutations granted by prior FACS urged us to use the same experimental approach in 10 patients achieving CR after induction, stratified according to undetectable vs persistent MRD by MFC. Phenotypically normal CD34 + hematopoietic progenitor cells (HPCs) were isolated in the former, whereas MRD cells were sorted in the latter patients; cells of the neutrophil, monocyte, and erythroid lineages were isolated in both. 168 SIMOES et al 10 JANUARY 2023 •VOLUME 7, NUMBER 1 Downloaded from http://ashpublications.org/bloodadvances/article-pdf/7/1/167/2027032/blooda_adv-2022-008141-main.pdf by guest on 02 May 2024 Newly diagnosed patients with AML MFC Identification of patient– specific aberrant immunophenotypes FACS NGS Blasts T cellsNeutroMono Erythro A TNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEBTNMEB ACD ASXL1 BCOR BCORL1 CBL CEBPA CSF3R DNMT3A ETV6 EZH2 EYA1 FLT3 FLT3-ITD IDH1 IDH2 JAK2 KRAS NF1 NPM1 NRAS PHF6 PPM1D PTPN11 RUNX1 SETBP1 SF3B1 SH2B3 SMC3 SRSF2 STAG2 TET2 TP53 WT1 pat.1 pat.2 pat.3 pat.4 pat.5 pat.6 pat.7 pat.8 pat.9 pat.10 pat.11 pat.12 pat.13 pat.14 pat.15 pat.16 pat.17 pat.18 pat.19 pat.20 pat.21 Cell type Blasts Neutrophils Monocytes Erythroblasts T Lymphocytes Without population Variant allele frequency 80-100 60-80 40-60 20-40 5-20 1. Stable transition 2. Branching evolution 3. Clonal evolution B B N M E T Figure 1. Reconstructing clonal evolution from dysplasia to AML. (A) Study design. BM aspirates collected from 358 patients with newly diagnosed AML were analyzed using MFC. In 21 patients, leukemic cells were isolated using FACS according to patient-specific aberrant phenotypes and so were cells of the neutrophil (Neutro), monocytic (Mono), and erythroid (Erythro) lineages whenever dysplastic phenotypes were observed in 1 or more lineages. T cells were systematically isolated for germline DNA. NGS of genes frequently mutated in myeloid neoplasms was performed in all cell types available in each patient. (B) Mutational status of 33 genes in T cells (T), neutrophils (N), monocytes (M), erythroblasts (E), and blasts (B) isolated from 21 patients at the onset of AML; cell types not available for NGS are represented with gray lines. Mutated genes were colored in a gradient of red according to the variant allele frequency (VAF). Three models were identified: (1) stable transition according to identical mutational landscapes in blasts and dysplastic cells; (2) branching evolution with blasts originating from leukemic stem cells other than the ones driving dysplasia, due to mutations absent in blasts and present in dysplastic cells; and (3) clonal evolution with new mutations in blasts onto mutations shared between these and dysplastic cells. (C) Percentage of mutations grouped according to functional categories that were simultaneously mutated in mature dysplastic cells and blasts (gray), or that were private in the former (blue) and the latter (purple). Functional categories with significantly different distributions were highlighted in bold. 10 JANUARY 2023 •VOLUME 7, NUMBER 1 RECONSTRUCTING AML TRANSFORMATION AT DIAGNOSIS 169 Downloaded from http://ashpublications.org/bloodadvances/article-pdf/7/1/167/2027032/blooda_adv-2022-008141-main.pdf by guest on 02 May 2024 Among patients with undetectable MRD, most mutations present at diagnosis became undetectable after induction (Figure 2A). One exception was mutated DNMT3A in CD34 + HPCs from patient 23, which could represent postremission clonal hematopoiesis, 21 and in erythroid cells from patient 24, which could represent the expansion of hematopoietic populations unrelated to the AML founding clone after induction therapy. 22 Although the clinical implications of postremission clonal hematopoesis remain poorly understood, 21 by performing NGS in isolated cell types, we showed that it is possible to monitor mutations with low variant allele frequency (VAF) present in single-cell compartments. Patient 27 unexpectedly showed mutated IDH2 and JAK2 in CD34 + HPCs and cells of the neutrophil, monocyte, and erythroid lineages, with VAF similar to that found at diagnosis. These results may reflect the inability of MFC to detect leukemic cells and their differentiated progeny in the selected patients with AML (Figure 2A). Accordingly, NGS performed in isolated cell types could reduce the rate of false-negative results in patients with undetectable MRD by MFC. 23,24 Among patients with persistent MRD, most mutations present at diagnosis were detected after induction, both in MRD and cells of the neutrophil, monocyte, and erythroid lineages (Figure 2B). These results may help to explain the presence of dysplasia detectable by MFC during MRD assessment, particularly in patients with persistent MRD. 25 Interestingly, new mutations emerged in MRD cells and their differentiated progeny in patients 30 and 31 (ie, PHF6 and TET2, respectively), which could either represent the acquisition of genetic traits enabling treatment resistance or the selection and expansion of minor clones hidden at diagnosis. 3,26 To investigate if our experimental approach could provide insights into the overlap between genetic alterations associated with leukemic transformation and chemoresistance, we relied on the broader coverage of exome sequencing to compare the genomic profile of dysplastic and leukemic cells at diagnosis and of MRD cells after induction in 6 patients with AML. In 5 of the 6 cases, there were mutations in dysplastic cells undetected in blasts at diagnosis and MRD (eg, MUC16 and FAM155B in patients 34 and 37, respectively), mutations shared by dysplastic cells and blasts at diagnosis undetected in MRD (eg, ZNF717 and MUC12 in patients 36 and 37, respectively), and mutations shared by dysplastic cells and MRD but undetected in blasts at diagnosis (eg, MUC2 and KIR2DL3 in patients 33 and 35, respectively) (supplemental Figure 4; Figure 2C). These results uncover different clonal involvement in dysplastic myelo-erythropoiesis, leukemic transformation, and chemoresistance, in accordance with recent single-cell analysis suggesting that clones emerging during AML transformation and those selected by treatment may differ. 2,3 In conclusion, we showed for the first time that it is possible to reconstruct leukemogenesis in ~80% of patients with newly diagnosed AML, using techniques other than single-cell multiomics. The possibility of identifying the genetic drivers of leukemic transformation and chemoresistance could be clinically meaningful to develop tailored treatment strategies aiming at the eradication of genetically diverse leukemic clones. Acknowledgments The authors acknowledge the patients, caregivers, and the biobank of the University of Navarra. This work was supported by grants from the Área de Oncología del Instituto de Salud Carlos III, Centro de Investigaci´ on Biom´ edica en Red (CIBER-ONC) (CB16/12/00369, CB16/12/00233, CB16/12/ 00489, and CB16/12/00284), Instituto de Salud Carlos III/Subdirecci ´ on General de Investigaci´ on Sanitaria (FIS numbers PI16/ 01661, PI16/00517, and PI19/01518), and the Plan de Investigaci ´ on de la Universidad de Navarra (PIUNA 2014-18). This work was supported internationally by the Cancer Research UK, FCAECC, and AIRC under the Accelerator Award Program (EDITOR). Authorship Contribution: C.S., J.F.S.-M., P.M., and B.P. conceived and designed the study; C.S., M.-C.C., I.V., B.A., L.B., and B.P. analyzed and interpreted the data; C.S. and B.P. performed the statistical analysis; M.C.-C., D.M.-C., M.-J.C., M.B.V., M.H.-R., P.A.-R., D.A., S.S., S. Villar, A.A.P., F.P., R.A., J.M.-L., J.M.B.B., S. Vives, J.A.P.-S., M.G.-F., T.B.d.C., M.C., M.O., J.I.R.-G., J.L., M.G., M.A.S., and P.M. provided the study material and/or patients; C.S. and B.P. drafted the manuscript; and all authors reviewed and approved the manuscript. Mature dysplastic cells Blasts Both Activated signaling Chromatin modifier Cohesin complex DNA methylation Spliceossome Transcription factor Tumor supressor Other CBL, FLT3, FLT3-ITD, JAK2, KIT, KRAS, NF1, NRAS, PTP11 ASXL1, ATRX, BCOR, EZH2, KMT2A SMC1A, SMC3, STAG2 DNMT3A, IDH1, IDH2, TET2 SF3B, SRSF2 BCORL1, CEBPA, CUX1, ETV6, RUNX PHF6, WT1, TP53 ANKRD26, CSF3R, CSNK1A1, DDX41, ETNK1, GATA1, NPM1, PPMD1, SETBP1, SH2B3 % 0 255075 100 C Figure 1 (continued) 170 SIMOES et al 10 JANUARY 2023 •VOLUME 7, NUMBER 1 Downloaded from http://ashpublications.org/bloodadvances/article-pdf/7/1/167/2027032/blooda_adv-2022-008141-main.pdf by guest on 02 May 2024 A 6 Pat.23 Pat.24 Pat.25 Pat.26 Pat.27 DNMT3A ETV6 SRSF2 TET2 CUX1 DNMT3A IDH2 NPM1 SRSF2 KRAS WT1 IDH2 JAK2 45 47 6 5 5 35 47 6 23 18 21 36 46 45 53 6 42 44 37 40 39 43 47 49 4745 80-100 VAF 60-80 40-60 20-40 5-20 Baseline After treatment Undetectable MRD Whole BM CD34+ HPC Neutrophils Monocytes Erythroblast T cells B Persistent MRD Pat.28 Pat.29 Pat.30 Pat.31 Pat.32 GATA2 TP53 ASXL1 KRAS SRSF2 TET2 SF3B1 U2AF1 TET2 PHF6 DNMT3A TP53 TET2 DNMT3A TP53 TET2 80-100 VAF 60-80 40-60 20-40 5-20 Baseline After treatment Whole BM MRD cells Neutrophils Monocytes Erythroblast T cells 98 89 39 22 47 48 45 48 47 48 47 46 48 50 48 50 49 35 48 45 45 38 33 50 49 42 37 44 94 94 90 44 49 49 48 47 44 49 51 49 50 50 52 50 52 47 49 48 49 51 48 50 47 49 44 46 48 44 48 35 48 30 47 28 47 6 50 33 44 98 94 18 55 44 14 49 24 74 42 21 49 43 77 39 7 51118145 9 8 43 49 50 21 7 9 Figure 2. Different clonal involvement in dysplastic myelo-erythropoiesis, leukemic transformation, and chemoresistance. (A-B) Patients (Pat.) with undetectable (n = 5) and persistent (n = 5) MRD had phenotypically normal CD34 + HPCs and MRD cells, respectively isolated, whereas cells of the neutrophil, monocyte, and erythroid lineages were isolated in all patients. NGS of genes frequently mutated in myeloid neoplasms was performed in all cell types available in each patient. The VAF of mutated genes was colored in a gradient of gray. If 2 mutations in the same gene were detected, the 2 VAFs are indicated. (C) Representative patient with exome sequencing of dysplastic cell types, blasts at diagnosis, and persistent MRD. The fish plot illustrates different clonal compositions at different stages of disease progression. The blue arrow is pointing to a mutation present in dysplastic cells though absent in blasts at diagnosis and MRD, the olive arrow is pointing to mutations present in dysplastic cells and blasts at diagnosis though not at MRD, and the black arrow points to mutations present in MRD and dysplastic cells though not in blasts at diagnosis. The bar widths indicate the respective VAFs. 10 JANUARY 2023 •VOLUME 7, NUMBER 1 RECONSTRUCTING AML TRANSFORMATION AT DIAGNOSIS 171 Downloaded from http://ashpublications.org/bloodadvances/article-pdf/7/1/167/2027032/blooda_adv-2022-008141-main.pdf by guest on 02 May 2024 Conflict-of-interest disclosure: F.P. received honoraria and research funding from Oryzon, Janssen, Bristol-Myers Squibb (BMS)/Celgene. R.A. serves as a member of the board of directors advisory committees for Incyte Corporation and Astellas and received honoraria from Novartis, Celgene, and Incyte. J.A.P.-S. received honoraria and funding budget for research projects and is active on the advisory board and learning activities or conferences of Janssen, Takeda, Pfizer, Jazz, BMS, Amgen, and Gilead. J.F.S.-M. does consultancy and is a member of the board of directors advisory committees for AbbVie, Amgen, BMS, Celgene, GlaxoSmithKline (GSK), Janssen, Karyopharm, Merck Sharpe & Dohme, Novartis, Regeneron, Roche, Sanofi, SecuraBio, and Takeda. P.M. provides consultancy, is a member of the board of directors advisory committees and speaker’s bureau, and received research funding from Celgene, Sanofi, Incyte, Karyopharm, Novartis, Stemline/Menarini, Agios, Astellas Pharma, and Daiichi Sankyo; is also a member of the board of directors advisory committees for Pfizer, Teva, and AbbVie; received research funding from and is a member of speaker’s bureau for Janssen; and provides consultancy for Tolero Pharmaceutical, Forma Therapeutics, and Glycomimetics. B.P. served as a consultant and received honoraria from Adaptive, Amgen, BD Biosciences, BMS/Celgene, GSK, Janssen, Roche, Sanofi, and Takeda and received research support from BMS/Celgene, GSK, Roche, Sanofi, and Takeda. The remaining authors declare no competing financial interests. ORCID profiles: C.S., 0000-0002-5713-8428; M.-C.C., 0000- 0003-1624-6059; D.M.-C., 0000-0001-7540-4091; M.-J.C., 0000-0002-0374-3008; I.V., 0000-0003-0027-6384; B.A., 0000- 0001-8819-402X; P.A.-R., 0000-0002-5871-372X; L.B., 0000- 0003-0998-2496; D.A., 0000-0003-0241-1375; S.V., 0000- 0002-4761-6692; A.A.P., 0000-0002-2478-5354; F.P., 0000- 0001-6115-8790; R.A., 0000-0002-2699-8353; J.M.-L., 0000- 0001-7908-0063; J.M.B.B., 0000-0001-8229-1208; M.G.-F., 0000-0002-0959-9449; T.B.d.C., 0000-0002-2338-513X; M.C., 0000-0002-4036-5050; M.O., 0000-0002-6326-5992; M.G., 0000-0001-6637-1072; J.F.S.-M., 0000-0002-9183-4857; M.Á.S., 0000-0003-1489-1177; P.M., 0000-0002-3275-5593; B.P., 0000-0003-1977-3815. 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