Updated Follow-Up In The CLL2007FMP Trial Supports The Non Superiority Of The Association Fludarabine-Cyclophosphamide (FC) Plus Campath Compared To FC Plus Rituximab and Points Out The Importance Of Minimal Residual Disease, By 6-Color Flow Cytometry Technique, On Progression Free Survival

Abstract Introduction CLL2007FMP (fit medically patients) is a Randomized Phase-III Trial conducted by the French Cooperative Group on CLL and WM (FCGCLL/WM) and the “Groupe Ouest-Est d'Etude des Leucémies et Autres Maladies du Sang” (GOELAMS), comparing FC plus Rituximab (FCR) to FC plus Campath (FCCam) in previously untreated fit patients with chronic lymphocytic leukemia (CLL). Early results showed that the FCCam regimen was associated with an unfavourable safety profile limiting significantly its use in this indication (Blood 2012). We present here the results of the extended follow up of the CLLFMP2007 trial, with particular emphasis on survival data, minimal residual disease (MRD) and late adverse events. Methods In this trial, 178 younger (<65) fit patients (pts) (cumulative illness rating scale (CIRS) score of up to 6), were enrolled between November 2007 and January 2009. Cases with del(17p) were excluded. Pts were randomly assigned to receive 6 oral courses of FCR (n=83) or FCCam arm (n=82). The primary endpoint of the study was 3-year progression-free survival (PFS). Secondary endpoints were safety, response to treatment, overall survival (OS) and MRD. MRD evaluation was performed by 6-color flow cytometry in an oligocentric manner. MRD testing was scheduled before therapy initiation and at final evaluation, (i.e. 3 months after completion of immunochemotherapy) where it was to be assessed for all responding patients in both peripheral blood (PB) and bone marrow (BM). Recruitment was interrupted in January 2009 after 165 pts had been randomized due to an excess of mortality in the FCCam arm. Results PFS and OS were not significantly different between the two arms. With a median follow-up of 55.5 months (interquartile range, 50-60), 57 pts in the FCCam arm were free of disease progression compared with 50 in the FCR arm, with a 3-year estimated PFS at 81% in both arms (p=0.80). Fourteen pts died in the FCCam arm (7 from progression and 7 from toxicity) and 9 died in the FCR arm (all from progression), with a 3-year estimated survival at 90% vs. 88% (p=0.85). PFS was significantly impacted by IGHV mutational status (p=0.001), Binet stage (p=0.0002) and MRD level. At final evaluation, MRD was established using the result in PB samples (available for 120 patients) and was determined in 103 pts by combining the results from blood and BM samples. Interpretation was based firstly on the use of the classical 10-4 threshold as reference and secondly on the limit of detection of the technique (0.7x10-5). In MRD-positive patients, the median PFS was 44.7 months (PB) whereas it was not reached in the group with MRD lower than 10-4 (p<0.0001, figure 1) ; similar data were found in MRD-positive PB+BM patients with a median PFS of 46 months whereas it was not reached in the group with MRD lower than 10-4 (p=0.002). No significant difference was found regarding OS but follow-up is still short for this evaluation. Similar results were observed when considering the limit of detection of the MRD technique (data not shown). Late toxicities (occurring after the final evaluation at 3 months after the end of treatment or at the ninth month when treatment was prematurely stopped) included : 1 bile duct cancer, 1 myelodysplastic syndrome, 1 transient ischemic attack, 1 lung adenocarcinoma and one prostate cancer in the FCR arm and 3 febrile neutropenia, 3 pneumonia (1 due to legionella), 1 pneumococcal sepsis, 1 bronchitis, 1 toxoplasma eye infection, 1 pyelonephritis, 2 herpes zoster, 1 acrodermatitis, 1 subdural hematoma, 1 autoimmune thrombocytopenia, 1 agranulocytosis, 1 autoimmune haemolytic anaemia in the FCCam arm. Conclusion Results of this extended follow-up of the CLL2007FMP trial confirm the absence of superiority of the FCCam regimen on OS and PFS. Interestingly, longer follow-up did not reveal a higher rate of late toxicity in FCCam arm, notably in terms of secondary malignancies; Similarly to early toxicity, late was adverse events were mainly infectious. Finally, MRD status determined by 6-color technique in PB and/or BM at post-treatment evaluation was predictive of PFS whatever the treatment arm. This finding is in line with recent reports in other studies pointing out to the powerful value of MRD as prognostic factor, supporting its use as PFS surrogate primary endpoint in clinical trials. Disclosures: Feugier: roche: Honoraria. Cazin:roche: meeting invitation Other, Membership on an entity’s Board of Directors or advisory committees; GSK: meeting invitation, meeting invitation Other, Membership on an entity’s Board of Directors or advisory committees.

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Minimal Residual Disease Status Predicts Progression-Free Survival in Newly Diagnosed Multiple Myeloma (NDMM) Patients Treated with Carfilzomib, Lenalidomide, and Low-Dose Dexamethasone (KRd)

Blood ◽

10.1182/blood.v124.21.2127.2127 ◽

2014 ◽

Vol 124 (21) ◽

pp. 2127-2127 ◽

Cited By ~ 2

Author(s):

Jagoda Jasielec ◽

Dominik Dytfeld ◽

Kent A. Griffith ◽

Kathryn McDonnell ◽

Daniel Lebovic ◽

...

Keyword(s):

Board Of Directors ◽

Residual Disease ◽

Progression Free Survival ◽

Complete Response ◽

Employment Equity ◽

Advisory Committees ◽

Free Survival ◽

Kaplan Meier ◽

Equity Ownership ◽

Minimal Residual

Abstract Background: NDMM patients (pts) treated with KRd in a phase 1/2 trial (NCT01029054) demonstrated high rates of complete response (CR, 64%) and stringent complete response (sCR, 55%) that correlated with excellent estimated 3-year progression-free survival (PFS; 79%) and overall survival (OS; 96%) (Jakubowiak et al, Blood, 2012; Jasielec et al, Blood 2013; 122(21):3220). Furthermore, there was a trend towards superior outcomes in patients with multiparameter flow cytometry (MFC) MRD-negative disease with an estimated 3 year PFS of 84% and OS of 100%, suggesting the importance of MRD analysis in predicting relapse. In this post hoc, retrospective analysis, we present an updated evaluation of PFS based on minimal residual disease (MRD) status. Methods: Pts received 28-day cycles of carfilzomib (CFZ) 20–36 mg/m2 intravenously (days [d]1, 2, 8, 9, 15, 16), lenalidomide (LEN) 25 mg orally (PO; d1–21), and dexamethasone 40/20 mg PO weekly (cycles 1–4/5–8). For cycles 8–24, KRd was given with a modified CFZ schedule (d1, 2, 15, 16), and single-agent LEN was administered after cycle 24. Pts had the option to receive stem cell transplantation after cycle 4. MRD assessment at the time of complete response (CR) was performed using 10-color MFC and next-generation sequencing (NGS) analysis. Fresh bone marrow aspirate (BMA) was used for MFC analysis as previously reported, while archived BMA slides were used for NGS analysis. The LymphoSIGHT™ NGS method employed universal primer sets to assess clonal rearrangements at the immunoglobulin loci (IGH-VDJ, IGH-DJ and IGK) in diagnostic BMA slides. Myeloma clonotypes were identified in the diagnostic BMA sample of each patient based on high-frequency within the B-cell repertoire. The level of the myeloma clonotype was then quantified in BMA slides obtained at the time of CR. Results: Twenty-two pts with CR/sCR were evaluated for MRD by both MFC and NGS methods with a median follow-up of 40 months. Limited input DNA was obtained from BMA slides (range 2,189 to 1,870,960 cell equivalents). Concordance analysis in 21 patients with both MFC and NGS MRD data revealed 11 patients that were MRD-negative by both MFC and NGS, while 2 patients were concordantly MRD-positive. NGS demonstrated greater sensitivity compared to MFC, as 8 patients were MRD-positive by NGS but MRD-negative by MFC. Three of these 8 patients relapsed. We evaluated the correlation between MRD status by NGS and PFS. Six MRD samples had less than 40,000 input cell equivalents and were removed from the progression-free survival analysis due to insufficient sample amount. MRD negativity by NGS in KRd patients at the time of CR was associated with longer progression-free survival (median not reached vs 46 months, p = 0.055) (Figure 1). Conclusions: Our results suggest that achievement of MRD-negative disease by NGS in CR patients is associated with superior PFS. The NGS method appears more sensitive than MFC at detecting residual disease. Finally, MRD assessment by NGS in BMA slides is feasible although may not be the optimal method due to limited input DNA amount. MRD assessment by NGS will be performed on the remainder of the KRd cohort and results will be presented. Figure 1. Kaplan-Meier analysis of progression-free survival for 6 MRD negative (<10-6) and 10 MRD positive (>10-6) patients. Figure 1. Kaplan-Meier analysis of progression-free survival for 6 MRD negative (<10-6) and 10 MRD positive (>10-6) patients. Disclosures Faham: Sequenta, Inc.: Employment, Equity Ownership, Membership on an entity's Board of Directors or advisory committees. Lee:Sequenta, Inc.: Employment, Equity Ownership. Jakubowiak:Bristol Myers-Squib: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees; Celgene: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Janssen: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Novartis: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees; Millennium: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees; Onyx: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; SkylineDx: Honoraria, Membership on an entity's Board of Directors or advisory committees.

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Maintenance of Long-Term Undetectable Minimal Residual Disease after Combination of Ibrutinib with Abbreviated Chemotherapy in the Icll-07 Filo Trial

Blood ◽

10.1182/blood-2019-126720 ◽

2019 ◽

Vol 134 (Supplement_1) ◽

pp. 3038-3038

Author(s):

Anne-Sophie Michallet ◽

Marie-Sarah Dilhuydy ◽

Fabien Subtil ◽

Valérie Rouille ◽

Beatrice Mahe ◽

...

Keyword(s):

Board Of Directors ◽

Minimal Residual Disease ◽

Research Funding ◽

Residual Disease ◽

Limit Of Detection ◽

Randomised Trial ◽

Primary Objective ◽

Advisory Committees ◽

Minimal Residual

Introduction In previously untreated, medically fit patients with chronic lymphocytic leukaemia (CLL) and no 17p deletion, there is current research interest in improving survival outcomes and potentially sparing some patients from the standard 6 cycles of fludarabine, cyclophosphamide and rituximab (FCR). The phase II ICLL-07 (NCT02666898) trial, conducted by the French Innovative Leukemia Organization (FILO), aimed to explore the efficacy of obinutuzumab and ibrutinib treatment induction for 9 months, followed by a minimal residual disease (MRD)-driven strategy. Methods Following assessment at Month 9, patients in complete response (CR) with bone marrow (BM) MRD <0·01% continued only ibrutinib 420 mg po daily for 6 additional months (I arm). Otherwise, patients received 4x4-weekly cycles of fludarabine/cyclophosphamide (FC) and obinutuzumab 1000 mg iv, alongside continuing ibrutinib for 6 additional months (FCGA+I arm). Beyond Month 16, response was clinically assessed every 3 months and MRD in PB until Month 40 and every 6 months during 36 months. MRD assessment was by 8-colour flow cytometry (limit of detection 10-6). The primary objective was to demonstrate a 30% or higher rate of CR with BM MRD <0·01% at Month 16, by intent-to-treat (ITT) analysis. Progression-free survival (PFS) and overall survival (OS) were secondary endpoints. ResultsBetween 10/2015 and 05/2017, 135 patients were enrolled. At Month 9, only 8% of patients reached CR with BM MRD <0·01%, and thus, in accordance with the MRD-driven strategy, were included in the I arm and continued only ibrutinib for 6 additional months. Most patients were included in the FCGA+I arm and received 4 cycles of FC and obinutuzumab, alongside continuing ibrutinib for 6 additional months. At Month 16, the ITT rate of CR with BM MRD <0·01% was 62% (84/135; 90% confidence interval [CI] 55−69). Of note, the primary objective was exceeded, and this high ITT rate was achieved with no more than 4 cycles of FC and obinutuzumab. The CR rate was 73% by investigator assessment versus 75% by an independent review committee. The PB and BM MRD <0·01% rate was 79%. The most common haematological adverse event (AE) was thrombocytopenia in 45 (34%) of 133 patients at grade 1−2 in Months 1−9 and in 43 (33%) of 130 patients at grade 1−2 in Months 9−15. The most common non-haematological AE were infusion-related reaction in 83 (62%) patients at grade 1−2 in Months 1−9 and gastrointestinal disorders in 62 (48%) patients at grade 1−2 in Months 9−15. A total of 49 serious AE occurred, most frequently infections (10), cardiac events (8) and haematological events (8). No treatment-related deaths occurred. After a median follow-up of 26.3 months, the 2-year PFS rate was 98% (95% CI 95−100) (Figure 1) and the 2-year OS rate was 97.5% (95% CI 96−100). The longitudinal follow-up of PB MRD in the entire cohort showed durability of a deep response, with a PB MRD <0.01% rate of 96% (n=92 evaluable patients) at Month 22 and 91% (n=85 evaluable patients) at Month 28. According to the treatment arm, in the FCGA+I arm, the PB MRD <0.01% rate was 99% at Month 22 and 93% at Month 28; by contrast, in the I arm, 77% of patients had PB MRD <0.01% at each of Months 22 and 28. The strategy achieved deep and durable molecular remission with a high level of undetectable (UD) PB MRD that was maintained over time, as shown in Figure 2. At Month 28, the rate of UD PB MRD was 83% in the FCGA+I arm versus 54% in the I arm. According to the immunoglobulin heavy gene variable (IGHV) mutational status, the PB MRD ≥0.01% rate at Month 28 was 4% for the mutated group versus 23% for the unmutated group (p=0.075, Fisher test). Conclusion These findings from the ICLL-07 trial demonstrated that, in previously untreated, medically fit patients with CLL and no 17p deletion, treatment induction with obinutuzumab and ibrutinib followed by an MRD-driven strategy yielded a high rate of CR with BM and PB MRD <0.01%, together with prolonged PFS and OS. With longer follow-up, including assessing the evolution of PB MRD, the response is maintained. This strategy could be an option in the first-line setting, although randomised trial evidence is needed. Disclosures Salles: Roche, Janssen, Gilead, Celgene: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Educational events; Amgen: Honoraria, Other: Educational events. Leblond:Gilead: Honoraria, Speakers Bureau; Abbvie: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Janssen: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Roche: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Amgen: Honoraria, Speakers Bureau; Astra Zeneca: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau. Cartron:Roche, Celgene: Consultancy; Sanofi, Gilead, Janssen, Roche, Celgene: Honoraria. Cymbalista:Sunesis: Research Funding; Roche: Research Funding; Janssen: Honoraria; Abbvie: Honoraria; AstraZeneca: Honoraria; Gilead: Honoraria. Le Garff-Tavernier:Alexion: Consultancy, Honoraria. Letestu:Alexion: Membership on an entity's Board of Directors or advisory committees, Other: speaker fee, expert contracts; Roche: Membership on an entity's Board of Directors or advisory committees, Other: speaker fee, expert contracts; Janssen: Membership on an entity's Board of Directors or advisory committees, Other: speaker fee, expert contracts; Abbvie: Membership on an entity's Board of Directors or advisory committees, Other: speaker fee, expert contracts. Feugier:janssen: Honoraria, Research Funding, Speakers Bureau; gilead: Honoraria, Research Funding, Speakers Bureau; abbvie: Honoraria, Research Funding, Speakers Bureau; roche: Honoraria, Research Funding, Speakers Bureau.

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Improving the Definition of Response Assessment: Prognostic Value of Minimal Residual Disease Combined with PET/CT at Day 100 Post Autologous Stem Cell Transplantation in Multiple Myeloma

Blood ◽

10.1182/blood-2020-142845 ◽

2020 ◽

Vol 136 (Supplement 1) ◽

pp. 33-34

Author(s):

Miguel Gonzalez-Velez ◽

Mariano Arribas ◽

Heidi E. Kosiorek ◽

Richard Butterfield ◽

Carlo Guerrero ◽

...

Keyword(s):

Board Of Directors ◽

Prognostic Value ◽

Residual Disease ◽

High Sensitivity ◽

Response Assessment ◽

Advisory Committees ◽

Pet Ct ◽

Definition Of ◽

Minimal Residual

Introduction: Response assessment at day 100 post Autologous Stem Cell Transplant (ASCT) is associated with long-term relapsed free survival (RFS) and overall survival (OS) in multiple myeloma (MM). The International Myeloma Working Group (IMWG) are the preferred criteria to define best response to treatment and define relapse. In the last years, response assessment has incorporated minimal residual disease (MRD) status -associated with improved RFS and OS (Munshi et al); and PET/CT combined with clinical characteristics -also associated with favorable outcomes (Zamagni et al. NCT01910987; MMY3033). The 2016 IMWG MRD criteria, combined imaging (PET/CT) plus next-generation sequencing (NGS) MRD-negative to define complete response (CR). To our knowledge, there is limited data examining the correlation and prognostic value of MRD and FDG-PET/CT at day 100 post ASCT in MM. IN this study, we aimed to determine the prognostic valued of MRD by NGS combined with PET/CT in RFS and OS status after high dose chemotherapy and ASCT in MM. Methods: Patients who underwent ASCT for MM at Mayo Clinic Arizona and had MRD and PET/CT data were included in the study. Clinical data was obtained via retrospective chart review. Cytogenetic risk (CyR) was classified using the mSMART criteria . Disease and ASCT related characteristics were compared by MRD status. MRD was measured by NGS on bone marrow aspirates using the previosly validated clonoSEQ ® Assay (Adaptive Biotechnologies Corporation, Seattle, USA) tracking the IgH, IgK and IgL rearrangements at a minimum sensitivity level of 10-5. MRD was defined by residual clonal cells per million nucleated cells as: negative= 0, borderline= 1-5, positive >5. PET/CT scans were performed locally at baseline and at day 100. Comparisons were performed using the chi-square test for categorical variables, Wilcoxon rank-sum test for continuos variables, McNemar's test and Cohens's Kappa for agreement measures. Results: A total of 103 patients had matched MRD and PET/CT assessment around day 100 (+/-9 days) and were included in the analysis. Median age at diagnosis was 62 years (range, 54-66 years), 71 patients (68.9%) were men. CyR was standard risk in 49 (47.6%), high-risk in 39 (37.9%) and unknown in 15 (14.6%) patients. Most 75 (72.8%) patients were MRD positive, 16 (15.5%) were MRD negative, and 12 (11.7%) borderline. The median main MRD clone detected was 64 (range 0-91,874). 70 patients (68%) and 33 (32%) had a negative and positive PET/CT respectively. The median follow-up time was 18 months (range, 13-31 months). At the time of data analysis, 10 patients (9.7%) had relapsed and only 4 (3.9%) had died. There was a high-correlation between MRD status and PET/CT, 31 patients (93.9%) with positive PET/CT were also MRD positive (p=0.0027). There were no statistical differences between PET/CT and CyR (p=0.95). We analyzed the correlation using the FREQ procedure (McNemars's test); there was a strong association between positive PET/CT and positive MRD in 31/33 patients (93.9%, high sensitivity), and low association for negative PET/CT the negative/borderline MRD in 26/70 (37.1%, low specificity; p<0.001). The agreement measure between the PET/CT and MRD using negative/borderline combined had a kappa of 0.23 (95% CI 0.11, 0.35) indicating a fair agreement beyond chance (Figure 1). PET/CT-CT was a statistically significant predictor of worse RFS (HR 3.53, 95%CI: 1.02-12.24, p<0.0337) and OS (HR 11.38, 95%CI: 1.18-109.56, p<0.0078) (Figure 2-3, respectively). MRD was not predictive of neither RFS (HR 1.72, 95%CI: 0.36-8.14, p<0.49) or OS (p<0.16). Conclusions: In conclusion, we demonstrate that the combination of MRD by NGS (clonoSEQ ®) and PET/CT at day 100 are complementary and have a high sensitivity (true positive rate) and fair correlation of agreement but low specificity (true negative rate). PET/CT was the best most sensitive technique to prognosticate RFS and OS. We did not find prognostic correlation of MRD with RFS and OS. However, our findings might be confounded by the low risk of relapse and death, a longer follow-up may demonstrate clinically important differences. Our results add evidence that MRD plus PET/CT improve the definition of CR in MM patients post ASCT. Prospective studies are needed to elucidate the optimal timing and role of combined MRD, PET/CT with other prognostic markers of clinical outcomes. Disclosures Larsen: Takeda: Honoraria, Membership on an entity's Board of Directors or advisory committees; Janssen Oncology: Honoraria, Membership on an entity's Board of Directors or advisory committees. Fonseca:Juno: Consultancy; Kite: Consultancy; Aduro: Consultancy; OncoTracker: Consultancy, Membership on an entity's Board of Directors or advisory committees; Merck: Consultancy; Bayer: Consultancy; Janssen: Consultancy; Takeda: Consultancy; Novartis: Consultancy; Pharmacyclics: Consultancy; Sanofi: Consultancy; Oncopeptides: Consultancy; GSK: Consultancy; AbbVie: Consultancy; Adaptive Biotechnologies: Membership on an entity's Board of Directors or advisory committees; Amgen: Consultancy; BMS: Consultancy; Celgene: Consultancy.

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Switching to Nilotinib Is Associated with Continued Deeper Molecular Responses in CML-CP Patients with Minimal Residual Disease After ≥ 2 Years On Imatinib: Enestcmr 2-Year Follow-up Results

Blood ◽

10.1182/blood.v120.21.694.694 ◽

2012 ◽

Vol 120 (21) ◽

pp. 694-694 ◽

Cited By ~ 2

Author(s):

Timothy P. Hughes ◽

Jeffrey H. Lipton ◽

Nelson Spector ◽

Brian Leber ◽

Ricardo Pasquini ◽

...

Keyword(s):

Board Of Directors ◽

Minimal Residual Disease ◽

Research Funding ◽

Residual Disease ◽

Molecular Response ◽

Advisory Committees ◽

Molecular Responses ◽

The Difference ◽

Minimal Residual

Abstract Abstract 694 Background: Superior rates of deeper molecular responses were achieved with nilotinib vs imatinib in patients newly diagnosed with Philadelphia chromosome–positive (Ph+) chronic myeloid leukemia in chronic phase (CML-CP) in the Evaluating Nilotinib Efficacy and Safety in Clinical Trials—newly diagnosed patients (ENESTnd) trial. In addition, the 12-month (mo) analysis of the ENEST—complete molecular response (ENESTcmr) study demonstrated that switching to nilotinib after a minimum of 2 years on imatinib led to increased rates of major molecular response (MMR) and deeper molecular responses vs remaining on imatinib. Results from ENESTcmr are presented here with minimum 24 mo of patient follow-up. Methods: Patients with Ph+ CML-CP who had achieved complete cytogenetic responses but still had persistent BCR-ABL positivity by real-time quantitative polymerase chain reaction (RQ-PCR) after ≥ 2 years on imatinib were eligible. Patients (n = 207) were randomized to switch to nilotinib 400 mg twice daily (BID; n = 104) or to continue on the same dose of imatinib (400 or 600 mg once daily [QD]; n = 103). Rates of MMR, MR4 (BCR-ABL ≤ 0.01% according to the International Scale [IS], corresponding to a 4-log reduction), MR4.5 (BCR-ABL ≤ 0.0032%IS, corresponding to 4.5-log reduction), and undetectable BCR-ABL via RQ-PCR with ≥ 4.5-log sensitivity were measured. Results: Among all randomized patients (intent-to-treat population), significantly more patients treated with nilotinib continued to achieve undetectable BCR-ABL by 24 mo (32.7% on nilotinib vs 16.5% on imatinib; P =.005; Table).The difference between the arms in achievement of this endpoint increased between 1 and 2 years (from 12.4% to 16.2%). The median time to MR4.5 and undetectable BCR-ABL was also significantly faster on nilotinib than on imatinib (P = .005 and .003, respectively). Cumulative rates of MR4.5 and undetectable BCR-ABL continued to be higher with nilotinib in patients without those responses at baseline, and the difference between arms appeared to increase over time. The safety profiles for nilotinib and imatinib were consistent with prior studies. By 24 mo, no patients in either arm progressed to accelerated phase/blast crisis. No patients on nilotinib died since the 12-mo analysis; 1 patient on imatinib died from metastatic prostate cancer in follow-up after discontinuation from the study. Conclusions: Switching to nilotinib led to significantly faster, deeper molecular responses in patients with minimal residual disease on long-term imatinib therapy. Since the 12-mo analysis, rates of deep molecular response (MR4.5 and undetectable BCR-ABL) have remained significantly higher in patients who did not have the response at baseline and were switched to nilotinib (vs those remaining on imatinib). In fact, the difference in favor of nilotinib increased between 1 and 2 years. These results suggest that switching to the more potent, selective tyrosine kinase inhibitor nilotinib is beneficial in patients with minimal residual disease after long-term imatinib therapy. Achievement of these deeper molecular responses (MR4.5 and undetectable BCR-ABL) after switching to nilotinib may enable a greater proportion of CML-CP patients to be eligible for future discontinuation studies. Cumulative rates of confirmed undetectable BCR-ABL by 24 mo will be presented as the confirmation assessments for several responders were not available at the time of this analysis. Disclosures: Hughes: Novartis Pharmaceuticals Corp: Consultancy, Honoraria, Research Funding; Bristol Myers Squibb: Consultancy, Honoraria, Research Funding; Ariad: Consultancy; CSL: Research Funding. Lipton:Novartis: Consultancy, Research Funding, Speakers Bureau. Spector:Novarits: Membership on an entity's Board of Directors or advisory committees, Research Funding; BMS: Consultancy. Leber:Novartis: Advisory Board Other, Honoraria, Speakers Bureau. Schwarer:Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees; BMS: Honoraria, Membership on an entity's Board of Directors or advisory committees; Pfizer: Honoraria, Membership on an entity's Board of Directors or advisory committees. Etienne:Novartis: Consultancy, Speakers Bureau; Pfizer: Consultancy; BMS: Consultancy, Speakers Bureau. Branford:Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; BMS: Honoraria, Research Funding; Ariad: Research Funding. Purkayastha:Novartis Pharmaceuticals Corp: Employment. Collins:Novartis Pharmaceuticals Corp: Employment. Szczudlo:Novartis Pharmaceuticals Corp: Employment. Cervantes:Novartis: Membership on an entity's Board of Directors or advisory committees; Sanofi-Aventis: Membership on an entity's Board of Directors or advisory committees; BMS: Speakers Bureau; Celgene: Membership on an entity's Board of Directors or advisory committees; Pfizer: Membership on an entity's Board of Directors or advisory committees; Teva Pharmaceuticals: Membership on an entity's Board of Directors or advisory committees.

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Safety and Efficacy of Venetoclax-Based Treatment in Elderly CLL Patients: A Retrospective Study from the Filo Group

Blood ◽

10.1182/blood-2021-149640 ◽

2021 ◽

Vol 138 (Supplement 1) ◽

pp. 3747-3747

Author(s):

Charlotte Doublet ◽

Marie-Sarah Dilhuydy ◽

Emmanuelle Ferrant ◽

Pierre Feugier ◽

Alexandra Fayault ◽

...

Keyword(s):

Retrospective Study ◽

Board Of Directors ◽

Research Funding ◽

Progression Free Survival ◽

Oncology Nurses ◽

Advisory Committees ◽

Free Survival ◽

Daily Dose ◽

History Of

Abstract Median age at diagnosis of chronic lymphocytic leukemia is 72 years. However, only few patients over 80 years of age are included in clinical trials, even in those devoted to unfit patients. In order to evaluate both efficiency and safety of venetoclax in this category of patients, we conducted a multicentric retrospective study and collected data from 77 CLL patients from 19 FILO centers who started venetoclax after 80 years of age. Median age at venetoclax initiation was 86 years old (81-97). 63% of patients had a history of heart disease, 62% had renal failure (moderate 59% and severe 3%) and 29% had a history of severe infections. Despite their comorbidities and a CIRS greater than 6 in 70% of cases, their autonomy was preserved with a median performans status of 1 (0-4). In this comorbid geriatric population, pretherapeutic geriatric assessment was only performed in a single patient. The median number of prior therapies was 2 (0-6) with an exposure to a BCR inhibitor in 56% of cases. 11q and 17p deletion were found in 39% and 30% of cases respectively, 39% of patients had a complex karyotype and 30% harbored a TP53 mutation. However, in this real life population, these prognostic factors were only performed in half of patients. IGHV mutational status was only available in 11 patients, and 83% of them had unmutated IGHV. At the time of venetoclax initiation, the tumor lysis syndrome (TLS) risk was moderate in 57% of cases and high in 8% of cases. Venetoclax was administered as a single agent (42%) or in association with rituximab (58%). In total, half of the patients were hospitalized at each dose ramp-up, and only 3 patients were treated on outpatient basis. 82% of the cohort was able to reach the daily dose of 400mg. Half of the patients were included in a phone call monitoring program with oncology nurses to pre-emptively manage side effects and foster therapy adherence. The safety study reported 14% of TLS, with 2 discontinuations of treatment within the first month: one of which led to dialysis and the other to death. As in the previously published studies, 25% of patients had infectious complications, and grade 3 haematological and digestive toxicities were reported in 42% and 22% of cases, respectively. The reduction of the daily dose of venetoclax was necessary for 33%. Permanent discontinuation of venetoclax occurred in 40% of subjects, including 29% of early withdrawal (within the first 3 months). Main reasons for discontinuation were intolerance (21%), CLL progression (21%), death (21%) and scheduled treatment discontinuation (10%). The overall response rate was 86%, consisting of 49% of complete response (unconfirmed by bone marrow biopsy) and 37% of partial response. With a median follow-up of 21months, estimated progression free survival and overall survival were 29 and 38 months respectively. Prior exposure to a BCR inhibitor had no impact on progression free survival. To conclude, venetoclax has a manageable safety profile in elderly patients with comorbidities and can induce prolonged responses. Finally, if additional follow-up by oncology nurses seems to be more and more implemented, the pre-therapeutic onco-geriatric evaluation remains underexploited in this population. Disclosures Ferrant: AstraZeneca: Honoraria; AbbVie: Honoraria, Other: Travel, Accommodations, Expenses; Janssen: Other: Travel, Accommodations, Expenses. Feugier: Janssen: Consultancy, Honoraria; Gilead: Consultancy, Honoraria; Abbvie: Consultancy, Honoraria; Amgen: Honoraria; Astrazeneca: Consultancy, Honoraria. Laribi: AstraZeneca: Other: Personal Fees; Le Mans Hospital: Research Funding; AbbVie: Other: Personal Fees, Research Funding; Jansen: Research Funding; Novartis: Other: Personal Fees, Research Funding; IQONE: Other: Personal Fees; Astellas Phama, Inc.: Other: Personal Fees; BeiGene: Other: Personal Fees; Takeda: Other: Personal Fees, Research Funding. Tchernonog: JANSSEN: Consultancy; ABBVIE: Consultancy; ASTRAZENECA: Consultancy. Dartigeas: Astra-Zeneca: Membership on an entity's Board of Directors or advisory committees, Other: travel grants/Congress; Abbvie: Membership on an entity's Board of Directors or advisory committees, Other: travel grants/Congress; Janssen: Membership on an entity's Board of Directors or advisory committees, Other: travel grants/Congress. Quinquenel: Abbvie: Honoraria; Janssen: Honoraria; AstraZeneca: Honoraria.

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Efficacy of Daratumumab, Lenalidomide and Dexamethasone Versus Lenalidomide and Dexamethasone Alone for Relapsed or Refractory Multiple Myeloma Among Patients with 1 to 3 Prior Lines of Therapy Based on Previous Treatment Exposure: Updated Analysis of Pollux

Blood ◽

10.1182/blood.v128.22.489.489 ◽

2016 ◽

Vol 128 (22) ◽

pp. 489-489 ◽

Cited By ~ 13

Author(s):

Philippe Moreau ◽

Jonathan L. Kaufman ◽

Heather J. Sutherland ◽

Marc Lalancette ◽

Hila Magen ◽

...

Keyword(s):

Multiple Myeloma ◽

Board Of Directors ◽

Research Funding ◽

Statistical Significance ◽

Previous Treatment ◽

Progression Free Survival ◽

Advisory Committees ◽

Free Survival ◽

Refractory Multiple Myeloma

Abstract Introduction: Daratumumab is an anti-CD38 IgGκ monoclonal antibody that has been combined successfully with lenalidomide and dexamethasone. The combination of daratumumab with lenalidomide and dexamethasone (DRd) has been compared with lenalidomide and dexamethasone alone (Rd) in patients (pts) with relapsed or refractory multiple myeloma (RRMM) in a randomized phase 3 study (Dimopoulos MA, et al. N Engl J Med 2016; in press). In a pre-specified interim analysis, the DRd combination demonstrated significantly longer progression-free survival (PFS) in addition to deep and durable responses compared with the Rd arm. We performed subgroup analyses to further examine these efficacy data according to prior treatment exposure. Methods: Pts who received ≥1 prior line of therapy were randomized (1:1) to Rd (lenalidomide: 25 mg PO on Days 1-21 of each 28-day cycle; dexamethasone: 40 mg PO weekly) with or without daratumumab (16 mg/kg IV qw for 8 weeks, q2w for 16 weeks, then q4w until progression). The primary endpoint was PFS. Pts who were refractory to lenalidomide were not eligible. All analyses were performed in pts who received 1 to 3 prior lines of therapy. Results: Median follow-up was 13.5 months. Pts who were lenalidomide-naive prior to the start of study treatment (DRd, n=226; Rd, n=219) demonstrated significantly longer PFS with DRd vs Rd (median: not reached [NR] vs 18.4 months; HR, 0.36; 95% CI, 0.25-0.52; P<0.0001), with estimated 12-month PFS rates of 83.0% vs 59.9%, respectively. ORR was significantly higher with DRd vs Rd (96% vs 79%), with ≥VGPR rates of 76% vs 47% and ≥CR rates of 44% vs 21%, respectively (P<0.0001 for all). In the lenalidomide-exposed subgroup (DRd, n=46; Rd, n=45), median PFS was NR in both treatment groups (HR, 0.49; 95% CI, 0.22-1.12; P=0.0826); estimated 12-month PFS rates were 84.1% vs 63.1%, respectively. ORR was higher with DRd vs Rd but did not reach statistical significance (87% vs 71%; P=0.0729); however, rates of ≥VGPR (78% vs 38%; P=0.0001) and ≥CR (44% vs 12%; P=0.0011) were significantly improved with DRd vs Rd, respectively. For bortezomib-naive pts (DRd, n=44; Rd, n=45), PFS was significantly longer with DRd vs Rd (median: NR vs 15.8 months; HR, 0.34; 95% CI, 0.13-0.86; P=0.0170), with estimated 12-month PFS rates of 85.4% vs 69.2%, respectively. ORR was significantly higher with DRd vs Rd (98% vs 82%; P=0.0158), with trends toward increased rates of ≥VGPR (74% vs 55%; P=0.0544) and ≥CR (42% vs 23%; P=0.0576). In the bortezomib-exposed pts (DRd, n=228; Rd, n=219), median PFS was NR in DRd vs 18.4 months in Rd (HR, 0.35; 95% CI, 0.24-0.50 P<0.0001); estimated 12-month PFS rates were 82.8% vs 58.7%, respectively. Significant differences in ORR (93% vs 77%), rate of ≥VGPR (77% vs 43%) and rate of ≥CR (44% vs 19%) were observed with DRd vs Rd, respectively (P<0.0001 for all). Among bortezomib-refractory patients (DRd, n=54; Rd, n=49), the PFS benefit of DRd compared with Rd was maintained (median: NR vs 10.3 mo, respectively; HR, 0.46; 95% CI, 0.25-0.85; P=0.0117; Figure). The estimated 12-month PFS rates were 70.8% vs 44.4%, respectively. Similar to bortezomib-exposed pts, ORR (92% vs 68%; P=0.0024), rate of ≥VGPR (75% vs 36%; P=0.0001), and rate of ≥CR (46% vs 13%; P=0.0003) were all significantly higher with DRd vs Rd for bortezomib-refractory pts. Updated data will be presented at the meeting. Conclusions: Among pts who received 1 to 3 prior lines of therapy, significantly longer PFS and higher ORR were observed with DRd vs Rd among pts who previously received bortezomib or were refractory to bortezomib or were lenalidomide-naive. Higher rates of deeper responses were observed in pts who previously received lenalidomide or bortezomib. Follow-up is ongoing to assess PFS in pts who received 1 to 3 prior lines of therapy and previously received lenalidomide. These results further strengthen the significant benefit of combining daratumumab with Rd for RRMM. Figure Progression-free Survival in Bortezomib-refractory Patients who Received 1 to 3 Prior Lines of Therapy Figure. Progression-free Survival in Bortezomib-refractory Patients who Received 1 to 3 Prior Lines of Therapy Disclosures Moreau: Janssen: Honoraria, Speakers Bureau; Novartis: Honoraria; Takeda: Honoraria; Celgene: Honoraria; Amgen: Honoraria; Bristol-Myers Squibb: Honoraria. Kaufman:Pharmacyclics: Consultancy; Incyte: Consultancy; Novartis: Consultancy, Research Funding; Celgene: Consultancy, Research Funding. Sutherland:Celgene: Consultancy, Honoraria; Amgen: Consultancy, Honoraria; Janssen: Consultancy, Honoraria. Lalancette:Celgene: Honoraria; BMS: Honoraria. Iida:Celgene: Honoraria, Research Funding; Janssen Pharmaceuticals: Honoraria, Research Funding. Prince:Janssen: Honoraria; Celgene: Honoraria. Cochrane:BMS: Other: Received sponsorship to attend international meetings; Novartis: Other: Received sponsorship to attend international meetings; Celgene: Other: Received sponsorship to attend international meetings; Takeda: Other: Received sponsorship to attend international meetings. Khokhar:Janssen: Employment. Guckert:Johnson & Johnson: Equity Ownership; Janssen: Employment. Qin:Janssen: Employment. Oriol:Janssen: Honoraria, Membership on an entity's Board of Directors or advisory committees; Celgene: Honoraria, Membership on an entity's Board of Directors or advisory committees; Amgen: Honoraria, Membership on an entity's Board of Directors or advisory committees.

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Minimal Residual Disease and Outcome Characteristics in Infant KMT2A-Germline Acute Lymphoblastic Leukemia Treated on the Interfant-06 Protocol

Blood ◽

10.1182/blood-2021-145058 ◽

2021 ◽

Vol 138 (Supplement 1) ◽

pp. 2383-2383

Author(s):

Janine Stutterheim ◽

Paola De Lorenzo ◽

Inge M. Van Der Sluis ◽

Julia Alten ◽

Philip Ancliffe ◽

...

Keyword(s):

Prognostic Factors ◽

Board Of Directors ◽

Minimal Residual Disease ◽

Residual Disease ◽

Univariate Analysis ◽

Advisory Board ◽

Research Support ◽

Advisory Committees ◽

Free Survival ◽

Minimal Residual

Abstract Background The outcome of infants with KMT2A-germline ALL is much better than of infants with KMT2A-rearranged ALL, but still worse than of non-infant ALL patients. Here, we describe the outcome and prognostic factors for infants with KMT2A-germline ALL treated on Interfant-06 protocol. Methods 167 infants with KMT2A-germline ALL were enrolled in Interfant-06. Univariate analysis on prognostic factors (age, WBC at diagnosis, prednisolone response and CD10 expression) was performed on KMT2A-germline infants in complete remission at the end of induction (EOI) (n=163). Bone marrow minimal residual disease (MRD) was measured in 73 patients, by real-time quantitative PCR of immunoglobulin genes and/or T-cell receptor genes, at various time points (EOI, n= 68, end of consolidation (EOC) n= 56, and before OCTADAD (n=57)). MRD results were classified as negative, intermediate (< 5*10 -4), and high (≥5*10 -4). Genetic data on NUTM1 rearrangements and MRD were available in 53 patients. Results The 6-year event free survival [SE] and overall survival [ SE] was 73.9% (3,6) and 87.2% (2.7). 28 of 31 (90%) relapses occurred early, within 2 years of diagnosis. Treatment related mortality was 3.6%. Age <6 months was a favorable prognostic factor with a 6-year disease-free survival (DFS) [SE] of 91% (9.0) compared to 71.7% (4.2) in infants >6 months of age (p=0.04). Of the MRD timepoints, MRD at end of induction (EOI) was most prognostic for outcome. At EOI, 76.5% (n=52/68) of patients were either MRD negative (41.2%, n=28) or intermediate MRD (35.3%, n=24). 23.5% (n=16) had high EOI MRD, which was associated with significantly lower 6-year DFS (SE), compared to patients with intermediate or negative EOI MRD (61.4% (12.4), 76.4% (11.3) and 87.9% (6.6), respectively; p=0.02, Figure 1a). At EOC, 55.4% (n=31/56) of patients were MRD negative. Outcome by MRD levels at EOC was not significantly different (p=0.24); the 6-year DFS (SE) of negative and intermediate EOC MRD patients was 89.0% (6.0) and 72.7 % (10.6), respectively, while only one of the 5 patients with high EOC MRD relapsed in BM and CNS (Figure 1b). MRD data for both EOI and EOC were available for 55 patients. Of these patients, 18 were MRD negative at EOI and EOC, with a 6-year DFS 93.3% (SE, 6.4). Five patients had negative EOI MRD, but showed intermediate EOC MRD levels; none of these patients relapsed. There were 12 of 55 patients who were MRD positive at EOI and became MRD negative at EOC. These patients had a 6-year DFS of 82.5 % (SE, 11.3). Patients with detectable disease at both timepoints had a 6-year DFS of 68.3% (SE,10.8) (n=20, Figure 1c). At the end of MARMA (TP5), 77.2% (n=44/57) of patients were MRD negative. MRD at TP5 was significantly related to DFS (Figure 1d); the 6-year DFS was 89.6% (SE, 5.0) for MRD negative patients, compared to 65.6% (SE, 14.0) for patients with intermediate MRD levels (p= 0.039). In the current study, NUTM1 status was known in 53 patients with MRD data. Of them, 13 harbored a NUTM1-rearrangement. Seven out of 11 (63.6%) were aged< 6 months and 6 out of 42 (14.3%) were older. None of them relapsed, despite positive EOI MRD detected in 8 cases. Conclusion We conclude that young age at diagnosis and low EOI MRD are favorable prognostic factors in infants with KMT2A-germline ALL. However, the prognostic value of MRD is not as strong as in infants with KMT2A-rearranged ALL or older children with ALL. This can partly be explained by the differences in genetic makeup of infants with KMT2A-germline ALL, thus supporting the hypothesis that in the future a combined MRD- and genetic-based stratification of KMT2A-g infants might be considered Figure 1 Figure 1. Disclosures Biondi: Colmmune: Honoraria; Bluebird: Other: Advisory Board; Novartis: Honoraria; Incyte: Consultancy, Other: Advisory Board; Amgen: Honoraria. Locatelli: Amgen: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Novartis: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Miltenyi: Speakers Bureau; Medac: Speakers Bureau; Jazz Pharamceutical: Speakers Bureau; Takeda: Speakers Bureau. Silverman: Takeda, Servier, Syndax, Jazz Pharmaceuticals: Current equity holder in publicly-traded company, Membership on an entity's Board of Directors or advisory committees. Schrappe: Novartis: Honoraria, Other: research support; SigmaTau: Other: research support; Amgen: Other: research support; Servier: Honoraria; Novartis: Honoraria; JazzPharma: Honoraria; JazzPharma: Honoraria, Other: research support; SHIRE: Other: research support; Servier: Honoraria, Other: research support.

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Making Clinical Decisions to Change Therapy Using Measurable Residual Disease Improves the Outcome in Multiple Myeloma

Blood ◽

10.1182/blood-2020-140352 ◽

2020 ◽

Vol 136 (Supplement 1) ◽

pp. 42-43

Author(s):

Joaquin Martinez Lopez ◽

Rafael Alonso Fernández ◽

Sandy W. Wong ◽

Rafael Rios ◽

Nina Shah ◽

...

Keyword(s):

Board Of Directors ◽

Research Funding ◽

Residual Disease ◽

Progression Free Survival ◽

Clinical Decision ◽

Clinical Decisions ◽

Advisory Committees ◽

Free Survival ◽

New Treatment ◽

Positive Results

Background Measurable residual disease (MRD) testing in multiple myeloma (MM) is increasingly being utilized in clinical trials for the assessment of disease response and as a prognostic tool for predicting response duration. However, there is only limited evidence to date for the use of MRD to make clinical decisions, a serious barrier to its potentially important role in the management of MM patients. This retrospective review analyzes the results of making clinical decisions to change therapy based on MRD assessments in MM patients. Methods We reviewed 373 patients with MM from 3 health centers through a retrospective search. Patients included in the study had at least one MRD assessment. Clinical decisions to change therapy based on MRD were made in 3 directions: 1. Stop or reduce treatment after MRD negative results; 2. Increase intensity of treatment after MRD positive results; 3. Start a new treatment line after MRD positive results. We gathered all the available data on clinical and biological parameters, induction treatment and response monitoring. MRD was assessed by flow cytometry or next-generation sequencing (Clonoseq) with sensitivity from 10-5to 10-6Statistical analyses were performed with SPSS software version 21.0 (SPSS, Inc., IBM, Armonk, NY). Results In 58 out of 373 (16%) patients a clinical decision to change therapy was made. Treatment was reduced or stopped in 24 cases (group 1). Intensity of treatment was increased in 20 cases(group 2) and a new treatment was started in 13cases(group 3). Most of these decisions were implemented during the post-ASCT maintenancephase, although in 3 cases ASCT was avoided based on the MRD result. For all 373 patients, the median progression-free survival (PFS) was 80 months. Of the 58 cases where a clinical decision was made to change therapy, 33 cases were MRD positive and 25 were MRD negative at the time the decisions were made. 33 patients in this group either remained MRD negative or eventually achieved MRD negativity. Patients in which a clinical decision was made to change therapy based on MRD (n=58) had a prolonged progression free survival versus those in which therapy remained the same (n=312) (median PFS 97 vs. 75 months, p=0.006) (Figure 1). Moreover, we once again confirmed that patients who achieve MRD negativity demonstrate a prolonged PFS vs those who don't achieve negativity (median PFS 97 vs. 57 months, p=0.0001). Conclusion Clinical decision-making to change therapy based on MRD in MM patients can improve patient outcomes. These results support the integration of MRD assessment in the management of MM patients. Disclosures Wong: Fortis: Research Funding; GSK: Research Funding; Roche: Research Funding; Janssen: Research Funding; Amgen: Consultancy; Sanofi: Membership on an entity's Board of Directors or advisory committees; Bristol Myers Squibb: Research Funding. Shah:GSK, Amgen, Indapta Therapeutics, Sanofi, BMS, CareDx, Kite, Karyopharm: Consultancy; BMS, Janssen, Bluebird Bio, Sutro Biopharma, Teneobio, Poseida, Nektar: Research Funding. Barrio Garcia:Altum sequencing: Current Employment. Martin:GSK: Consultancy; Sanofi: Research Funding; AMGEN: Research Funding; Seattle Genetics: Research Funding; Janssen: Research Funding. Wolf:Adaptive: Consultancy, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau.

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Highly Sensitive Droplet Digital PCR for MYD88L265P Mutation Detection and Minimal Residual Disease Monitoring in Waldenström Macroglobulinemia

Blood ◽

10.1182/blood.v126.23.2645.2645 ◽

2015 ◽

Vol 126 (23) ◽

pp. 2645-2645

Author(s):

Daniela Drandi ◽

Elisa Genuardi ◽

Paola Ghione ◽

Daniele Grimaldi ◽

Barbara Mantoan ◽

...

Keyword(s):

Board Of Directors ◽

Mutation Detection ◽

Residual Disease ◽

Digital Pcr ◽

Droplet Digital Pcr ◽

Advisory Committees ◽

Highly Sensitive ◽

Sensitive Tool ◽

Minimal Residual

Abstract Background. Recently, the somatic MYD88L265P mutation has been found as the hallmark of Waldenström Macroglobulinemia (WM), being detectable in nearly 90% of cases, as well as in up to 50% of IgM MGUS, rarely in other non-Hodgkin lymphomas and never in multiple myeloma (MM). Beyond its potential diagnostic role, this mutation has been associated with tumor growth and therapy resistance. Moreover, MYD88L265P might represent an ideal marker for minimal residual disease (MRD) monitoring in a disease whose therapeutic scenario has been rapidly changing, with many new available and highly effective drugs (nucleoside analogues, proteasome and BTK-inhibitors). However, the current MYD88L265P allele-specific quantitative PCR (ASqPCR) diagnostic tool lacks sensitivity (1.00E-03) and thus is not suitable for MRD. Moreover, is not useful to test peripheral blood (PB), that harbors low concentrations of circulating tumor cells (especially after immunochemotherapy), neither to assess cell-free DNA (cfDNA), usually present at very low amount in plasma. Therefore, our study aims: 1) to assess whether a highly sensitive tool as droplet digital PCR (ddPCR) might be helpful in MYD88L265P screening; 2) to evaluate whether MYD88L265P might be a suitable marker for MRD monitoring in WM. Methods. Bone marrow (BM) and PB samples were collected at diagnosis and during follow-up from a local series of patients affected by WM, IgM MGUS and IgG-secreting lymphoplasmacytic lymphoma (LPL), as well as samples from healthy subjects and MM were used as negative controls. Genomic (gDNA) and cell-free DNA (cfDNA) were extracted as recommended (Qiagen). MYD88L265P was assessed on 100 ng of gDNA by ASqPCR as previously described [Xu 2013] and by ddPCR, using a custom dual labelled probe assay (Bio-Rad). When available, 50 ng of cfDNA were tested for MYD88L265P, only by ddPCR. ddPCR was performed on 20 µl of reaction at 55°C for 40 cycles, run on QX100 droplet reader and analyzed by QuantaSoft v1.6.6 (Bio-Rad). MYD88L265P ASqPCR level was estimated as described [Treon 2012]. ΔCT<8.4 identified a MYD88L265P positive sample. Similarly, MYD88L265P ddPCR cut-off was settled on the highest healthy samples level. IGH rearrangements identification and IGH-based MRD analysis were performed as previously described [van der Velden 2007]. Results. Once the ddPCR assay was optimized, the sensitivity of MYD88L265P ddPCR was compared to ASqPCR on a ten-fold serial dilution standard curves built with a 70% MYD88L265P mutated WM sample, previously identified by Sanger sequencing [Treon 2012]. Whereas ASqPCR confirmed the reported sensitivity of 1.00E−03, ddPCR reached a sensitivity of 5.00E−05. Thereafter, overall 105 samples (48 BM, 57 PB, 52 diagnosis and 53 follow up) from 58 patients (49 WM, 5 IgM MGUS and 4 LPL) as well as 20 controls (15 healthy subjects and 5 MM) were tested by both methods. 32/33 (97%) diagnostic BM scored positive for MYD88L265P by both ddPCR and ASqPCR (being the only one negative a WM), while ddPCR, was able to detect more mutated cases, than ASqPCR, among diagnostic PB samples: 15/19 (79%) vs 9/19 (47%) (Table1). Moreover, to investigate whether the MYD88L265P ddPCR tool could be used for MRD detection we compared it to the standardized IGH-based MRD. An IGH-based MRD marker was found in 40/53 (75%) patients (37 WM and 3 LPL). Five Patients, so far analyzed, with baseline and follow up samples (18 BM, 5 PB) showed highly superimposable results between the two methods. Finally, pivotal results on cfDNA from 10 patients showed higher median levels of MYD88L265P mutation in plasma if compared to PB. Conclusions. We developed a new tool for diagnosis and MRD monitoring in WM, showing that: 1) ddPCR is a highly sensitive tool for MYD88L265P detection, especially useful in low infiltrated samples, like PB; 2) MYD88L265P can be effectively and easily used for MRD monitoring in WM, achieving similar results to standardized IGH-based MRD; 3) cfDNA recovered from plasma might be an attractive alternative for MYD88L265P detection, deserving further investigation. Methodological validation against IgH-based MRD detection and Flow cytometry and correlations with clinical impact are currently ongoing on external samples series. Table 1.PATIENTSWM (45)LPL (2)IgM MGUS (5)TISSUEBMPBBMPBBMPBSAMPLES31141114MYD88L265P ddPCR/ASqPCR30/3011/71/10/01/14/2 TABLE 1. MYD88L265P mutation detection in diagnostic samples: ddPCR vs ASqPCR Disclosures Boccadoro: Sanofi: Consultancy, Membership on an entity's Board of Directors or advisory committees; Celgene: Consultancy, Membership on an entity's Board of Directors or advisory committees; Onyx Pharmaceuticals: Consultancy, Membership on an entity's Board of Directors or advisory committees; Janssen-Cilag: Consultancy, Membership on an entity's Board of Directors or advisory committees.

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Heavy and Light Chain Monitoring in High Risk Smoldering Multiple Myeloma Patients Included in the GEM-CESAR Trial: Comparison with Conventional and Minimal Residual Disease IMWG Response Assessment

Blood ◽

10.1182/blood-2019-128655 ◽

2019 ◽

Vol 134 (Supplement_1) ◽

pp. 1852-1852

Author(s):

Noemi Puig ◽

Teresa Contreras ◽

Bruno Paiva ◽

María Teresa Cedena ◽

José J Pérez ◽

...

Keyword(s):

Multiple Myeloma ◽

Bone Marrow ◽

High Risk ◽

Board Of Directors ◽

Research Funding ◽

Residual Disease ◽

Response Assessment ◽

Advisory Committees ◽

Minimal Residual

Introduction: The GEM-CESAR trial is a potentially curative strategy for high-risk smoldering multiple myeloma (HRsMM) patients (pts) in which the primary endpoint is the achievement of bone marrow minimal residual disease (MRD) negativity. However, other methods of disease evaluation in serum such as heavy+light chain (HLC) assessment, with a potential complementary value to the IMWG response criteria, have also been tested. Aim: To evaluate the performance of HLC assay in HRsMM pts at diagnosis and after consolidation, comparing the results with standard serological methods and Next Generation Flow (NGF) for the assessment of bone marrow MRD. Patients and Methods: Ninety HRsMM pts included in the GEM-CESAR trial received six 4-weeks cycles of carfilzomib, lenalidomide and dexamethasone followed by high dose melphalan and 2 further cycles of consolidation with the same regimen. All pts received maintenance treatment with lenalidomide for up to 2 years. SPEP and IFE were performed using standard procedures. Serum IgGk, IgGl, IgAk and IgAl HLC concentrations were measured using Hevylite (The Binding Site Group Ltd, Birmingham, UK) on a SPA PLUS turbidimeter. HLC concentrations and ratios were considered abnormal if they were outside the 95% reference ranges provided by the manufacturer. MRD was analyzed by flow cytometry following EuroFlow recommendations (sensitivity, 2x10-6). Standard response assignment was carried out as per the IMWG guidelines. Hevylite responses were assigned and HLC-pair suppression was defined as in Michalet et al (Leukemia 2018). Results: Out of 90 HRsMM pts, 75 had monoclonal intact immunoglobulin and samples available at diagnosis (50 IgG and 25 IgA). HLC ratio was abnormal in 98% of IgG pts and in 100% of IgA pts. Response assessment by Hevylite and standard IMWG criteria were available in 62 pts post-consolidation (Table 1). A good agreement was found between the two methods (kappa quadratic weighting = 0,6327 (0,4016 - 0,8638)). Among 46 pts with assigned CR as per the IMWG response criteria, there were 3 and 8 pts in PR and VGPR according to the Hevylite method, respectively. In 62 cases, paired Hevylite and MRD assessment data were available. Concordant results were found in 72.5% of cases (45/62; HLC+/NGF+ in 15 and HLC-/NGF- in 30 cases) while in the remaining 27.4% of cases results were discordant (17/62; HLC-/NGF+ in 6 and HLC+/NGF- in 11 cases). Post-consolidation, 24, 25.8 and 42.3% of the 62 samples were positive by SPEP, NGF and Hevylite, respectively. HLC-pair suppression was identified in 13/62 pts; 10 had severe HLC-pair suppression at the end of consolidation. After a median follow-up of 32 months (8-128), 93% of pts remain alive and progression-free. Three patients that have already progressed had their responses assessed post-consolidation. The first pt was assigned VGPR by the standard IMWG criteria and PR by Hevylite and was MRD positive by NGF; the second pt was assigned CR by IMWG criteria and Hevylite but had severe HLC-pair immunosuppression and was MRD positive by NGF; the third pt was in CR by IMWG and HLC criteria and was MRD positive by MFC. Conclusions: Moderate agreement was found between response assessment by Hevylite and the standard IMWG methods as well as between Hevylite and MRD assessment by NGF. Most discordances were a result of Hevylite detecting disease in samples negative by the standard methods, but longer follow-up is needed to ascertain its clinical value. HLC assessment could have anticipated the progression noted in 2 (out of 3) patients. Disclosures Puig: Takeda, Amgen: Consultancy, Honoraria; The Binding Site: Honoraria; Janssen: Consultancy, Honoraria, Research Funding; Celgene: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Paiva:Amgen, Bristol-Myers Squibb, Celgene, Janssen, Merck, Novartis, Roche and Sanofi: Honoraria, Membership on an entity's Board of Directors or advisory committees; Celgene, Janssen, Sanofi and Takeda: Consultancy. Rodriguez Otero:Kite Pharma: Consultancy; Celgene Corporation: Consultancy, Honoraria, Speakers Bureau; BMS: Honoraria; Janssen: Consultancy, Honoraria; Takeda: Consultancy. Oriol:Celgene, Amgen, Takeda, Jansse: Consultancy, Speakers Bureau. Rios:Janssen: Honoraria, Membership on an entity's Board of Directors or advisory committees; Celgene: Honoraria, Membership on an entity's Board of Directors or advisory committees. Alegre:Celgene, Amgen, Janssen, Takeda: Membership on an entity's Board of Directors or advisory committees. de la Rubia:Amgen: Consultancy; Janssen: Consultancy; Celgene: Consultancy; Takeda: Consultancy; AbbVie: Consultancy. De Arriba:Celgene: Consultancy, Honoraria; Janssen: Consultancy, Honoraria; Amgen: Consultancy, Honoraria; Takeda: Honoraria. Ocio:Celgene: Consultancy, Honoraria, Research Funding; Sanofi: Research Funding; BMS: Honoraria; Novartis: Consultancy, Honoraria; Array Pharmaceuticals: Research Funding; Pharmamar: Consultancy; Seattle Genetics: Consultancy; Mundipharma: Research Funding; Amgen: Consultancy, Honoraria, Research Funding; Takeda: Consultancy, Honoraria; AbbVie: Consultancy; Janssen: Consultancy, Honoraria. Bladé:Janssen, Celgene, Amgen, Takeda: Membership on an entity's Board of Directors or advisory committees; Irctures: Honoraria. Mateos:Janssen: Honoraria, Membership on an entity's Board of Directors or advisory committees; Pharmamar: Membership on an entity's Board of Directors or advisory committees; Celgene: Honoraria, Membership on an entity's Board of Directors or advisory committees; GSK: Membership on an entity's Board of Directors or advisory committees; Abbvie: Membership on an entity's Board of Directors or advisory committees; EDO: Membership on an entity's Board of Directors or advisory committees; Amgen: Honoraria, Membership on an entity's Board of Directors or advisory committees; Adaptive: Honoraria; Takeda: Honoraria, Membership on an entity's Board of Directors or advisory committees.

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