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Bansal R, Paludo J, Spychalla M, McClanahan A, Holland A, Truong T, Hathcock M, Alkhateeb HB, Dingli D, Hayman SR, Kapoor P, Kenderian SS, Kourelis T, Kumar S, Shah MV, Siddiqui M, Warsame R, Bisneto JV, Bennani NN, Johnston PB, Ansell S, Lin Y. Outpatient Practice Pattern and Clinical Outcome for Axicabtagene Ciloleucel in Patients with Aggressive Lymphoma. Transplant Cell Ther 2021. [DOI: 10.1016/s2666-6367(21)00256-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Nandakumar B, Kumar SK, Dispenzieri A, Buadi FK, Dingli D, Lacy MQ, Hayman SR, Kapoor P, Leung N, Fonder A, Hobbs M, Hwa YL, Muchtar E, Warsame R, Kourelis TV, Russell S, Lust JA, Lin Y, Siddiqui M, Go RS, Jevremovic D, Kyle RA, Gertz MA, Rajkumar SV, Gonsalves WI. Clinical Characteristics and Outcomes of Patients With Primary Plasma Cell Leukemia in the Era of Novel Agent Therapy. Mayo Clin Proc 2021; 96:677-687. [PMID: 33673918 PMCID: PMC7939118 DOI: 10.1016/j.mayocp.2020.06.060] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 06/02/2020] [Accepted: 06/05/2020] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To evaluate the clinical outcomes of patients with primary plasma cell leukemia (pPCL) defined by 5% or greater clonal circulating plasma cells on peripheral blood smear and treated with novel agent induction therapies. PATIENTS AND METHODS A cohort of 68 patients with pPCL diagnosed at the Mayo Clinic in Rochester, Minnesota, from January 1, 2000, to December 31, 2019, and treated with novel agent induction therapies was evaluated. RESULTS The median follow-up was 46 (95% CI, 41 to 90) months. The median bone marrow plasma cell content was 85% (range, 10% to 100%) and median clonal circulaitng plasma cell percentage on the peripheral blood smear was 26% (range, 5% to 93%). There was a preponderance of t(11;14) primary cytogenetic abnormality in this cohort. The median time to next therapy (TTNT) and overall survival (OS) for all patients with pPCL patients in this cohort was 13 (95% CI, 9 to 17) and 23 (95% CI, 19 to 38) months, respectively. However, when stratified by cytogenetic risk, the median TTNT and OS were 16 and 51 months for standard risk vs 9 and 19 months for high risk (P=.01 for OS). CONCLUSION Primary plasma cell leukemia remains an aggressive disease with poor prognosis despite novel agent-based therapies. Some patients have better than expected survival and this phenomenon may be influenced by the absence of high-risk cytogenetics. Newer treatment regimens are needed to improve the prognosis of this devastating disease.
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Muchtar E, Gertz MA, Kumar SK, Lacy MQ, Leung N, Buadi FK, Dingli D, Hayman SR, Go RS, Kapoor P, Gonsalves W, Kourelis TV, Warsame R, Hwa YL, Fonder A, Hobbs M, Russell S, Lust JA, Siddiqui M, Rajkumar SV, Kyle RA, Dispenzieri A. Characterization and prognostic implication of delayed complete response in AL amyloidosis. Eur J Haematol 2021; 106:354-361. [PMID: 33230879 PMCID: PMC8103541 DOI: 10.1111/ejh.13554] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 11/17/2020] [Accepted: 11/18/2020] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Little is known on continued response following completion of therapy in light chain (AL) amyloidosis. METHODS We studied 373 AL amyloidosis patients who achieved complete response (CR) or very good partial response (VGPR) to first-line therapy. RESULTS By end of therapy (EOT), 46% of patients achieved a CR and 54% a VGPR. With no further therapy, 17.5% of patients were upstaged from VGPR to CR (delayed CR), with a median of 9 months. Compared with CR and VGPR at EOT, patients with a delayed CR were characterized by higher proportion of t(11;14) and lower rate of trisomies. Autologous stem cell transplant was more frequent in the delayed CR group. Patients with a delayed CR were characterized by minimal residual disease negativity and organ response rates similar to patients with CR at EOT and higher than patients achieving VGPR at EOT. Patients with a delayed CR had a longer PFS/OS compared to patients with CR or VGPR by EOT (median PFS 149 vs 92 vs 52 months, P < .001; 10-year OS 87% vs 71% vs 56%, P < .001). CONCLUSIONS This study characterizes delayed CR in AL amyloidosis, highlights its prognostic impact which is at least similar to those who achieved CR at EOT, and underlines another aspect of response monitoring.
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Visram A, Vaxman I, S Al Saleh A, Parmar H, Dispenzieri A, Kapoor P, Lacy MQ, Gertz MA, Buadi FK, Hayman SR, Dingli D, Warsame R, Kourelis T, Siddiqui M, Gonsalves W, Muchtar E, Lust JA, Leung N, Kyle RA, Murray D, Rajkumar SV, Kumar S. Disease monitoring with quantitative serum IgA levels provides a more reliable response assessment in multiple myeloma patients. Leukemia 2021; 35:1428-1437. [PMID: 33623138 PMCID: PMC8102180 DOI: 10.1038/s41375-021-01180-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 01/13/2021] [Accepted: 02/01/2021] [Indexed: 01/22/2023]
Abstract
Unlike IgG monoclonal proteins (MCPs), IgA MCP quantification is unreliable due to beta-migration of IgA MCPs on serum protein electrophoresis (SPEP). The utility of nephelometric quantitative IgA (qIgA) to monitor IgA multiple myeloma (MM) is unclear. We retrospectively studied disease response kinetics using qIgA versus MCPs by SPEP, and developed and validated novel qIgA disease assessment criteria in 491 IgA MM patients. The SPEP MCP nadir occurred a median of 41 (IQR 0-102) days before the qIgA. The median time to achieve a partial response (PR) was shorter using standard IMWG versus qIgA response criteria (32 vs 58 days, p < 0.001). Stratification by qIgA criteria, unlike IMWG criteria, led to clear separation of the progression-free survival curves of patients achieving a PR or very good PR. There was a consistent trend toward earlier detection of disease progression using qIgA versus IMWG progression criteria. In conclusion, monitoring IgA MM using MCP-based IMWG criteria may be falsely reassuring, given that MCP levels on SPEP decrease faster than qIgA levels. The qIgA response criteria more accurately stratify patients based on the progression risk and may detect disease progression earlier, which may lead to more consistent measurement of trial endpoints and improved patient outcomes.
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Abdallah N, Muchtar E, Dispenzieri A, Gonsalves W, Buadi F, Lacy MQ, Hayman SR, Kourelis T, Kapoor P, Go RS, Warsame R, Leung N, Rajkumar SV, Kyle RA, Pruthi RK, Gertz MA, Kumar SK. Coagulation Abnormalities in Light Chain Amyloidosis. Mayo Clin Proc 2021; 96:377-387. [PMID: 33549257 DOI: 10.1016/j.mayocp.2020.06.061] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 05/11/2020] [Accepted: 06/05/2020] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To assess the prevalence of coagulation abnormalities in patients with systemic light chain (AL) amyloidosis and their association with disease-related characteristics, disease progression, and survival. PATIENTS AND METHODS This is a retrospective study of patients with AL amyloidosis seen at Mayo Clinic, Rochester, Minnesota, from January 1, 2006, to December 31, 2015. We studied the association between abnormal coagulation parameters and baseline characteristics and their association with survival outcomes. RESULTS The study included 411 patients. Abnormalities at diagnosis included prolonged clotting times and coagulation factor deficiencies; prolonged prothrombin time (PT) and factor X (FX) deficiency were found in 19% (73 of 390) and 43% (177 of 411) of patients, respectively. The FX deficiency was associated with higher Mayo stage, involvement of more than 1 organ, liver and cardiac involvement, and greater than 10% bone marrow plasma cells. On univariate analysis, the risk for disease progression or death was higher in patients with abnormal values for PT and factor V, factor VII (FVII), FX, and factor XII compared with those with normal values. Prolonged PT and FVII and FX deficiencies were independent predictors of death after adjusting for Mayo stage and more than 1 organ involvement. Only 106 patients had repeat testing after treatment; no clear relationship was found between treatment response and changes in coagulation parameters. CONCLUSION Coagulation abnormalities occur in a significant proportion of patients with AL amyloidosis and are associated with advanced disease and inferior outcomes. Larger studies are needed to establish whether a relationship exists between treatment response and improvement in individual parameters.
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Visram A, Al Saleh AS, Parmar H, McDonald JS, Lieske JC, Vaxman I, Muchtar E, Hobbs M, Fonder A, Hwa YL, Buadi FK, Dingli D, Lacy MQ, Dispenzieri A, Kapoor P, Hayman SR, Warsame R, Kourelis TV, Siddiqui M, Gonsalves WI, Lust JA, Kyle RA, Vincent Rajkumar S, Gertz MA, Kumar SK, Leung N. Correlation between urine ACR and 24-h proteinuria in a real-world cohort of systemic AL amyloidosis patients. Blood Cancer J 2020; 10:124. [PMID: 33311451 PMCID: PMC7733489 DOI: 10.1038/s41408-020-00391-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 10/13/2020] [Accepted: 10/26/2020] [Indexed: 12/15/2022] Open
Abstract
A 24-h urine protein collection (24hUP), the gold standard for measuring albuminuria in systemic AL amyloidosis, is cumbersome and inaccurate. We retrospectively reviewed 575 patients with systemic AL amyloidosis to assess the correlation between a urine albumin to creatinine ratio (uACR) and the 24hUP. The uACR correlated strongly with 24hUP at diagnosis (Pearson’s r = 0.87, 95% CI 0.83–0.90) and during the disease course (Pearson’s r = 0.88, 95% CI 0.86–0.90). A uACR ≥300 mg/g estimated a 24hUP ≥ 500 mg with a sensitivity of 92% and specificity of 97% (area under the receiver operating curve = 0.938, 95% CI 0.919–0.957). A uACR cutoff of 3600 mg/g best predicted a 24hUP > 5000 g (sensitivity 93%, specificity 94%), and renal stage at diagnosis was strongly concordant using either 24hUP or uACR as the proteinuria measure (k = 0.823, 95% CI 0.728–0.919). In patients with serial urine collections, a > 30% decrease in uACR predicted a > 30% decrease in 24hUP with a sensitivity of 94%. In conclusion, the uACR is a reliable and convenient method for ruling out proteinuria >500 mg per day, prognosticating renal outcomes, and assessing renal response to therapy. Further studies are needed to validate the uACR cutoffs proposed in this study.
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Wang Y, Rabe KG, Bold MS, Shi M, Hanson CA, Schwager SM, Call TG, Kenderian SS, Muchtar E, Hayman SR, Koehler AB, Fonder AL, Chanan-Khan AA, Van Dyke DL, Slager SL, Kay NE, Ding W, Leis JF, Parikh SA. The role of 18F-FDG-PET in detecting Richter's transformation of chronic lymphocytic leukemia in patients receiving therapy with a B-cell receptor inhibitor. Haematologica 2020; 105:2675-2678. [PMID: 33131260 PMCID: PMC7604634 DOI: 10.3324/haematol.2019.240564] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
MESH Headings
- Cell Transformation, Neoplastic
- Fluorodeoxyglucose F18
- Humans
- Leukemia, Lymphocytic, Chronic, B-Cell/diagnostic imaging
- Leukemia, Lymphocytic, Chronic, B-Cell/drug therapy
- Lymphoma, Large B-Cell, Diffuse
- Positron-Emission Tomography
- Receptors, Antigen, B-Cell
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Muchtar E, Gertz MA, Lacy MQ, Leung N, Buadi FK, Dingli D, Hayman SR, Go RS, Kapoor P, Gonsalves W, Kourelis TV, Warsame R, Hwa YL, Fonder A, Hobbs M, Russell S, Lust JA, Siddiqui M, Rajkumar SV, Kyle RA, Kumar SK, Dispenzieri A. Refining amyloid complete hematological response: Quantitative serum free light chains superior to ratio. Am J Hematol 2020; 95:1280-1287. [PMID: 32681737 DOI: 10.1002/ajh.25940] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 07/13/2020] [Indexed: 12/17/2022]
Abstract
Response assessment in light chain (AL) amyloidosis is based on serum and urine monoclonal protein studies. Newly diagnosed patients (n = 373) who achieved very good partial response or complete response (CR) to first line therapy were assessed for the survival impact of each of the monoclonal protein studies. At end of therapy (EOT), negative serum/urine immunofixation (IFE) was achieved in 61% of patients, 72% achieved normal serum free light chain ratio (sFLCR), and the median involved free light chain (iFLC) and difference between involved to uninvolved light chain (dFLC) were 17 mg/L and 5 mg/L, respectively. Overall, 46% of patients achieved a CR at EOT. At EOT, iFLC ≤20 mg/L and dFLC ≤10 mg/L were additive in survival discrimination to negative serum/urine IFE and were independent predictors of overall survival. In contrast, normalization of sFLCR did not add survival discrimination to serum/urine IFE and was not independent predictor of survival. We propose a new definition for hematological CR to include serum/urine IFE negativity plus iFLC ≤20 mg/L or dFLC ≤10 mg/L, instead of the current definition of serum/urine IFE negativity and normal sFLCR. Complete response using dFLC ≤10 mg/L had the best performance in those with significant renal dysfunction and by light chain isotype, making it the preferred partner to IFE. Validation of these results in a multicenter cohort is warranted.
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Abdallah N, Baughn LB, Rajkumar SV, Kapoor P, Gertz MA, Dispenzieri A, Lacy MQ, Hayman SR, Buadi FK, Dingli D, Go RS, Hwa YL, Fonder A, Hobbs M, Lin Y, Leung N, Kourelis T, Warsame R, Siddiqui M, Lust J, Kyle RA, Ketterling R, Bergsagel L, Greipp P, Kumar SK. Implications of MYC Rearrangements in Newly Diagnosed Multiple Myeloma. Clin Cancer Res 2020; 26:6581-6588. [PMID: 33008815 DOI: 10.1158/1078-0432.ccr-20-2283] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 08/20/2020] [Accepted: 09/29/2020] [Indexed: 12/18/2022]
Abstract
PURPOSE Rearrangements involving the MYC protooncogene are common in newly diagnosed multiple myeloma, but their prognostic significance is still unclear. The purpose of this study was to assess the impact of MYC rearrangement on clinical characteristics, treatment response, and survival in patients with newly diagnosed multiple myeloma. EXPERIMENTAL DESIGN This is a retrospective study including 1,342 patients seen in Mayo Clinic in Rochester, MN, from January 2006 to January 2018, who had cytogenetic testing by FISH at diagnosis, including MYC testing using the break apart FISH probe (8q24.1). RESULTS A rearrangement involving MYC was found in 8% of patients and was associated with elevated β2-microglobulin, ≥50% bone marrow plasma cells, IgA multiple myeloma, and the cooccurrence of trisomies. There were no differences in overall response rates between patients with and without MYC rearrangement when induction chemotherapy was proteasome inhibitor (PI)-based, immunomodulatory drug (IMiD)-based or PI + IMiD-based. Overall survival was shorter in patients with MYC rearrangement compared with patients without MYC rearrangement (5.3 vs. 8.0 years, P < 0.001). MYC rearrangement was associated with increased risk of death on multivariate analysis when high-risk cytogenetic abnormalities, ISS stage III, and ≥70 years of age were included (risk ratio: 1.5; P = 0.007). CONCLUSIONS MYC rearrangement is associated with high disease burden and is an independent adverse prognostic factor in patients with newly diagnosed multiple myeloma.
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Heybeli C, Sridharan M, Alkhateeb HB, Villasboas Bisneto JC, Buadi FK, Chen D, Dingli D, Dispenzieri A, Gertz MA, Go RS, Hashmi SK, Hayman SR, Hogan WJ, Inwards DJ, Kenderian SS, Kumar SK, Litzow MR, Porrata LF, Lacy MQ, Micallef IN, Patnaik MM, Shah MV, Leung N. Characteristics of late transplant-associated thrombotic microangiopathy in patients who underwent allogeneic hematopoietic stem cell transplantation. Am J Hematol 2020; 95:1170-1179. [PMID: 32618000 DOI: 10.1002/ajh.25922] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/19/2020] [Accepted: 06/27/2020] [Indexed: 12/23/2022]
Abstract
Transplant-associated thrombotic microangiopathy (TA-TMA) has a wide range of presentations after hematopoietic stem-cell transplantation (HSCT). We retrospectively studied the risk factors and outcomes of patients with early (≤day 100) and late (>day 100) TA-TMA. Among the 1451 HSCT recipients, early TA-TMA occurred in 45 (3.1%) patients at a median of 27 (3-91) days, and late TA-TMA in 39 (2.7%) patients at a median of 303 (122-2595) days. Patients with early TA-TMA were more likely to have high blood calcineurin-inhibitor levels (P < .001) and acute graph-vs-host disease (GVHD, P < .001), while late TMA patients were more likely to have chronic GVHD (P < .001). The estimated median overall survival after onset of TMA for the entire cohort was 6 months. The estimated median overall survival was not reached in patients with an improvement of TMA vs 2 months in patients with no improvement (P < .001). In the early TMA group, older age (for every 10 years, HR 1.40; 95% CI 1.00-1.94; P = .049) and bacterial infection (HR 2.42; 95% CI 0.98-6.00; P = .056) were positively associated with mortality. Switching to MMF treatment (HR 0.40; 95% CI 0.16-0.99; P = .047) and improvement of TMA (HR 0.08; 95% CI 0.03-0.25; P < .001) were negatively associated with mortality in the multivariate analysis. In the late TMA group, the improvement of TMA was the only independent predictor associated with a lower risk of death (HR 0.05; 95% CI 0.02-0.19; P < .001). Mortality rates in both early and late TMA remain unacceptably high. Future studies are needed for early diagnosis, trigger identifications, and use of targeted treatments.
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Paquin A, Visram A, Kumar SK, Gertz MA, Cantwell H, Buadi FK, Lacy MQ, Dispenzieri A, Dingli D, Hwa L, Fonder A, Hobbs M, Hayman SR, Lust JA, Russell SJ, Leung N, Kapoor P, Go RS, Lin Y, Gonsalves WI, Kourelis T, Warsame R, Kyle RA, Rajkumar SV. Characteristics of exceptional responders to autologous stem cell transplantation in multiple myeloma. Blood Cancer J 2020; 10:87. [PMID: 32859899 PMCID: PMC7455690 DOI: 10.1038/s41408-020-00353-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 08/06/2020] [Accepted: 08/17/2020] [Indexed: 11/09/2022] Open
Abstract
Autologous stem cell transplantation (ASCT) is an important treatment modality in multiple myeloma (MM). However, relapse following ASCT is considered almost inevitable. This study aimed to characterize exceptional responders to ASCT, defined as progression-free survival (PFS) >8 years in the absence of maintenance therapy. We retrospectively analyzed patients treated at Mayo Clinic between August 1, 1998 and January 3, 2006, and included those with symptomatic MM, treated with an ASCT within 12 months of diagnosis. We found that 46 (9%) of the 509 patients who underwent ASCT during the study period were exceptional responders. The median duration of follow-up from diagnosis was 16.2 (interquartile range 14.3–17.7) years. The best response to therapy was a complete response (CR) or better in 34 (74%) of patients, and less than a CR in 12 (26%) of patients. The median PFS was 13.8 (95% confidence interval 10.5–18.5) years, and at the time of the last hematology assessment, 24 of 46 (52%) patients remained in remission. In conclusion, we showed that a small subset of patients with MM attains durable disease control without maintenance therapy post ASCT. Pre-emptive identification of these patients may help prevent undue toxicities and costs of subsequent therapy.
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Muchtar E, Gertz MA, Kourelis TV, Sidana S, Go RS, Lacy MQ, Buadi FK, Dingli D, Hayman SR, Kapoor P, Leung N, Fonder A, Hobbs M, Hwa YL, Gonsalves W, Warsame R, Russell S, Lust JA, Lin Y, Zeldenrust S, Rajkumar SV, Kyle RA, Kumar SK, Dispenzieri A. Correction: Bone marrow plasma cells 20% or greater discriminate presentation, response, and survival in AL amyloidosis. Leukemia 2020; 34:2819. [PMID: 32728185 DOI: 10.1038/s41375-020-0993-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Al Saleh AS, Parmar HV, Vaxman I, Visram A, Hasib Sidiqi M, Muchtar E, Buadi FK, Dispenzieri A, Warsame R, Lacy MQ, Dingli D, Gonsalves WI, Wolf RC, Kourelis TV, Hogan WJ, Hayman SR, Kapoor P, Kumar SK, Gertz MA. Prognostic value of NT-ProBNP and troponin T in patients with light chain amyloidosis and kidney dysfunction undergoing autologous stem cell transplantation. Bone Marrow Transplant 2020; 56:274-277. [PMID: 32623446 DOI: 10.1038/s41409-020-0990-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 06/06/2020] [Accepted: 06/23/2020] [Indexed: 11/09/2022]
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Evans LA, Jevremovic D, Nandakumar B, Dispenzieri A, Buadi FK, Dingli D, Lacy MQ, Hayman SR, Kapoor P, Leung N, Fonder A, Hobbs M, Hwa YL, Muchtar E, Warsame R, Kourelis TV, Go R, Russell S, Lust JA, Lin Y, Siddiqui M, Kyle RA, Gertz MA, Rajkumar SV, Kumar SK, Gonsalves WI. Utilizing multiparametric flow cytometry in the diagnosis of patients with primary plasma cell leukemia. Am J Hematol 2020; 95:637-642. [PMID: 32129510 DOI: 10.1002/ajh.25773] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Revised: 02/26/2020] [Accepted: 02/27/2020] [Indexed: 12/22/2022]
Abstract
The diagnosis of primary plasma cell leukemia (pPCL) has been made by quantifying circulating plasma cells (cPCs) morphologically on a peripheral blood (PB) smear. However, this technique is not sufficiently sensitive. Multiparametric flow cytometry (MFC) provides a readily available and highly sensitive method to identify and quantify cPCs that could complement PB smear assessment. However, an optimal quantitative cutoff for cPCs by MFC to identify pPCL has not been established. Thus, a total of 591 patients newly diagnosed multiple myeloma (NDMM) patients who had their PB samples evaluated morphologically by PB smear, and immunophenotypically by MFC prior to beginning therapy were evaluated. The presence of ≥200 cPCs/μL by MFC (N = 25 or 5% of the total population) was chosen to identify patients with ≥5% cPCs by PB smear with a specificity of 99% and a sensitivity of 77%. For patients with ≥200 cPCs/μL by MFC compared to the remainder of the cohort, the median Time to next therapy (TTNT) was 18 vs 30 months and the median OS was 38 vs 70 months respectively. Thus, MFC assessment of PB can be utilized in conjunction with the morphological assessment of a PB smear to aid in improving the identification of pPCL among NDMM patients.
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Koehler AB, Leung N, Call TG, Rabe KG, Achenbach SJ, Ding W, Kenderian SS, Leis JF, Wang Y, Muchtar E, Hayman SR, Hampel PJ, Finnes HD, Schwager SM, Slager SL, Kay NE, Parikh SA. Incidence and risk of tumor lysis syndrome in patients with relapsed chronic lymphocytic leukemia (CLL) treated with venetoclax in routine clinical practice. Leuk Lymphoma 2020; 61:2383-2388. [DOI: 10.1080/10428194.2020.1768384] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Al Saleh AS, Dispenzieri A, Muchtar E, Wolf RC, Dingli D, Lacy M, Warsame RM, Gonsalves WI, Kourelis T, Hogan WJ, Hayman SR, Kapoor P, Buadi F, Kumar S, Gertz MA. Prognostic role of beta-2 microglobulin in patients with light chain amyloidosis treated with autologous stem cell transplantation. J Clin Oncol 2020. [DOI: 10.1200/jco.2020.38.15_suppl.e20506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e20506 Background: Autologous stem cell transplantation (ASCT) prolongs survival in patients with light chain (AL) amyloidosis. Mayo 2012 stage and increased plasma cell percentage (%PC) are known predictors for survival. Increased beta-2 microglobulin (B2M) predicts survival in patients with multiple myeloma. However, its prognostic effect in patients with AL amyloidosis undergoing ASCT is not known. Methods: We retrospectively reviewed patients who had a diagnosis of AL amyloidosis and were treated with ASCT between July-1996 and September-2017. Patients with creatinine > 1.2 mg/dL were excluded, as that affects B2M levels. The receiver operator curve was used to determine the best cutoff for B2M in predicting survival and was 2.5 mcg/mL. Baseline characteristics were compared between patients with B2M > 2.5 and ≤2.5. Progression-free survival (PFS) was defined as time from ASCT to relapse or death, whichever occurred first. Overall survival (OS) was calculated from ASCT to death of any cause. Univariate and multivariate analysis were done for OS. Results: Five-hundred patients were identified and 222 (44%) had a B2M > 2.5. These patients were more likely to be > 65 years old (32% vs. 17%, P = 0.0001), have Mayo 2012 stage III/IV (33% vs. 8%, P < 0.0001), have ≥3 organs involved (25% vs. 14%, P = 0.001), and have ≥10% PCs (56% vs. 40%, P = 0.0002) compared to patients with B2M ≤2.5. The median PFS and OS were shorter in patients with B2M > 2.5 (median PFS: 64 vs. 80 months, P = 0.03); (median OS: 104.9 vs. 175.5 months, P < 0.0001). On univariate analysis, predictors for OS included age > 65 (HR: 1.6, P = 0.001), Mayo 2012 stage III/IV (HR: 3.3, P < 0.0001), ≥3 organs involved (HR: 1.3, P = 0.06), ≥10% PC (HR: 1.5, P = 0.004), melphalan conditioning 200mg/m2 (HR: 0.28, P < 0.0001), and B2M > 2.5 (HR: 1.8, P < 0.0001). In a multivariate analysis, only Mayo 2012 stage III/IV (HR: 1.8, P = 0.006), melphalan conditioning 200mg/m2 (HR: 0.35, P < 0.0001), and B2M > 2.5 (HR: 1.7, P = 0.01) remained independent predictive of OS. Conclusions: Beta-2 microglobulin > 2.5 is an independent predictor for OS in AL amyloidosis patients undergoing ASCT and should be routinely measured.
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Nandakumar BN, Kumar S, Dispenzieri A, Buadi F, Dingli D, Lacy M, Kapoor P, Lin Y, Kourelis T, Muchtar E, Lust JA, Go RS, Warsame RM, Hayman SR, Leung N, Jevremovic D, Gertz MA, Kyle RA, Rajkumar SV, Gonsalves WI. Outcomes of patients with primary plasma cell leukemia (pPCL) in the era of novel agent therapy. J Clin Oncol 2020. [DOI: 10.1200/jco.2020.38.15_suppl.e20510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e20510 Background: pPCL is a rare and aggressive form of multiple myeloma (MM) with dismal survival outcomes compared to the remainder of MM patients. Several studies have validated the optimal cutoff for defining pPCL to be >5% circulating plasma cells (cPCs) on a peripheral blood smear due to equally poor outcomes in this less restrictive cohort. We evaluated the clinical outcomes and cytogenetic features of patients diagnosed with pPCL at our institution that were treated with novel agent induction therapies. Methods: We evaluated patients with pPCL diagnosed between 2000 – 2018 (using the 5% cut off) at Mayo Clinic, Minnesota. Data was extracted from a prospectively maintained database and from the review of electronic medical records. Patients were categorized as having high risk (HR) cytogenetics if any of the following abnormalities were present: del 17p, t(4;14), t(14;16) or t(14;20). Chi-square tests and Fisher exact tests were used to compare differences between sub-groups. Survival analysis was performed by the Kaplan-Meier method and differences assessed using the log rank test. Results: This cohort consisted of 67 patients with pPCL with a median age of 62 years (range: 34-91) of which 33 (46%) were male. The median follow up was 46 months (95% CI: 41 – 90). The median bone marrow plasma cell involvement was 84% (Range: 10 – 100) and the median cPCs percentage on the peripheral blood was 23% (range: 5 - 93). Data on primary cytogenetic abnormalities were available in 60 (85%) patients and the distribution was as follows: t(11;14) – 27 (45%), t(4;14) – 5 (8%), t(14;16) – 8 (13%), t(14;20)- 3(5%) and del 17p- 15(25%). All patients received novel agent induction therapy with 36 (54%) having received autologous stem cell transplant and 4 undergoing an allogeneic stem cell transplant. The median time to next therapy (TTNT) and overall survival (OS) for all patients was 13 months (95% CI: 9 – 17) and 24 months (95% CI: 19 – 40) respectively; 16 months and 51 months for standard risk (SR) vs. 10 months and 19 months for HR (P = 0.005 for OS), when stratified by cytogenetic risk. There were only 17 (31%) patients who were alive for ≥48 months since diagnosis (i.e. twice the median OS of this cohort); The absence of high risk cytogenetics (P = 0.049) and non-elevated LDH level (P = 0.047) at diagnosis predicted for achieving this survival goal. Conclusions: The outcomes of patients diagnosed with pPCL remain poor despite the use of novel agent induction therapy. However, some patients appear to do better than expected and this phenomenon may be influenced by the presence of HR cytogenetics.
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Abdallah N, Buadi F, Greipp PT, Gertz MA, Kapoor P, Dispenzieri A, Baughn L, Lacy M, Hayman SR, Dingli D, Go RS, Hobbs MA, Lin Y, Kourelis T, Siddiqui MA, Kyle RA, Ketterling RP, Rajkumar SV, Bergsagel LP, Kumar S. Cytogenetic abnormalities in MM: Association with disease characteristics and treatment response. J Clin Oncol 2020. [DOI: 10.1200/jco.2020.38.15_suppl.e20520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e20520 Background: Cytogenetic abnormalities detected by FISH are found in the majority of multiple myeloma (MM) patients. Although their prognostic value has been studied extensively, less is known about their association with disease characteristics and treatment response. Methods: To address these questions, we designed a retrospective study including 2031 Mayo Clinic patients diagnosed with MM from 2004 to 2018. We compared baseline characteristics and treatment outcomes between primary cytogenetic groups: t(11;14), t(4;14), t(14;16), (14;20), t(6;14), unknown IgH translocation/del and trisomy (without IgH translocation). These included 373, 177, 78, 20, 18, 228 and 791 patients respectively. Kruskal-Wallis and Fisher’s exact tests were used for categorical and continuous variables respectively. Time to next treatment (TTNT) was estimated using Kaplan-Meier method and compared using Log-Rank test. Results: t(4;14), t(14;16), t(6;14) and t(14;20) groups were associated with hemoglobin < 10 g/dL, beta2microglobulin > 5.5 µg/ml, ISS stage 3 and ≥50% bone marrow plasma cells. The latter 3 groups were also associated with renal dysfunction (Cr ≥2 mg/dL) and higher urinary monoclonal protein. t(4;14) was associated with IgA isotype, serum monoclonal protein ≥1g/dL and plasma cell labeling index ≥1%. Light chain myeloma was more prevalent in patients with t(11;14). Overall response rate (ORR) to proteasome inhibitor (PI) induction was higher for those with IgH translocations (any) compared to trisomies (85% vs 77% P = 0.02), while ORR was higher for those with trisomies with immunomodulatory drug (IMiD) induction (90% vs 78% P < 0.01). The rate of ≥ very good partial response was higher for patients with high risk IgH translocations [t(4;14), t(14;16) or t(14;20)] compared to standard risk with PI-IMiD combination treatment (88% vs 65% P < 0.01). Otherwise, response rates did not differ between these 2 groups. TTNT was longer in patients with trisomies compared to those with IgH translocation with IMiD or PI-IMiD treatments (32.2 vs 19 and 44 vs 27.4 months, respectively P < 0.01). For all cytogenetic groups, better treatment responses and longer TTNT were seen with PI-IMiD combinations compared to other treatments. Conclusions: t(4;14), t(14;16), t(6;14), and t(14;20) are associated with high risk disease characteristics. Patients with IgH translocations may have better response to PI induction compared to those with trisomies, while those with trisomies may have better response to IMiD treatment, with best outcomes for both seen with PI-IMiD combinations.
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69
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Vaxman I, Sidiqi MH, Al Saleh AS, Kumar S, Muchtar E, Dispenzieri A, Buadi F, Dingli D, Lacy M, Hayman SR, Leung N, Gonsalves WI, Kourelis T, Warsame RM, Hogan WJ, Gertz MA. Depth of response prior to autologous stem cell transplantation to predict survival in light chain amyloidosis. J Clin Oncol 2020. [DOI: 10.1200/jco.2020.38.15_suppl.8516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
8516 Background: The role of induction therapy prior to autologous stem cell transplant (ASCT) in immunoglobulin light chain (AL) amyloidosis remains controversial. Data on the prognostic impact of response to induction in a transplanted cohort are lacking. The aim of this study was to assess the impact of response to induction therapy on survival in patients undergoing ASCT for AL amyloidosis. Methods: We conducted a retrospective study of all newly diagnosed AL amyloidosis patients who received induction prior to ASCT between January 2007 and August 2017 at Mayo Clinic, Rochester, Minnesota. Patients receiving only corticosteroids prior to transplant were excluded as were those with an involved light chain of less than 5 mg/dL (not measurable for response). Results: 134 patients met inclusion criteria. The median age at diagnosis was 60 (range 36-74) and 85 (63%) were men. The most commonly used induction regimen was proteasome inhibitor-based (73.1%, n=98). The overall response rate to induction was 83% (complete response 17%, very good partial response 30% and partial response 36%). With a median follow up of 56.5 months, the median PFS and OS was 48.5 months and not reached, respectively. Response depth to induction therapy was associated with improved PFS and OS and was independent of the bone marrow plasma cell percentage. The median PFS was not reached for patients achieving ≥VGPR prior to ASCT and 33.8 months for patient achieving PR or less (P=0.001). The median OS was longer in patients with deeper responses (not reached for patients achieving ≥VGPR vs. 128 months for patients achieving PR or less (P=0.02). On multivariable analysis, independent predictors of OS were melphalan conditioning dose (RR= 0.38; P=0.018) and depth of response prior to transplant (RR 2.52; P=0.039). Conclusions: Hematologic response prior to transplant predicts post-transplant outcomes in patients with AL amyloidosis. [Table: see text]
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Visram A, Al Saleh AS, Parmar HV, Murray DL, Dingli D, Lacy M, Dispenzieri A, Gertz MA, Buadi F, Kapoor P, Hayman SR, Warsame RM, Kourelis T, Siddiqui MA, Gonsalves WI, Muchtar E, Lust JA, Rajkumar SV, Kumar S. Assessing the utility of monitoring IgA multiple myeloma patients with quantitative serum IgA levels. J Clin Oncol 2020. [DOI: 10.1200/jco.2020.38.15_suppl.e20515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e20515 Background: IgA monoclonal proteins (MCPs), unlike IgG MCPs, often migrate in the beta region on serum protein electrophoresis (SPEP) which can lead to underestimation of their size due to the co-migration with physiologic proteins. In IgA multiple myeloma (MM), the utility of quantitative IgA levels in assessing disease response in comparison to SPEP is not well studied. Methods: We retrospectively analyzed 304 IgA MM patients, diagnosed between 2004 and 2018, with available serial MCP and quantitative IgA levels. Kaplan Meier analysis was used to estimate the median progression free survival (mPFS) using the IMWG criteria and our study definition of IgA progression (2 consecutive IgA values that are > 25% above the nadir IgA value and above upper limit of normal (ULN) of 356 mg/dL, and a detectable IgA MCP on serum immunofixation). The mPFS was defined as the time from treatment initiation until disease progression or death. Results: IgA MCP migrated in the beta region in 134 (44%) patients, and in the gamma region in 150 (56%) patients. At diagnosis the median MCP was 3 (IQR 1.9-4) g/dL and the median IgA was 3240 (IQR 2008-4420) mg/dL. The median time from treatment initiation to MCP nadir was 80 (IQR 42-144) days and median time to IgA nadir was 154 (IQR 90-238) days. At MCP nadir 40% of patients had an IgA above the ULN. All complete responders (n = 104) had normal IgA levels, with a median IgA of 54 (IQR 27-88) g/dL. A ≥90% decrease in IgA between treatment initiation and IgA nadir, compared to a < 90% decrease, was associated with a longer mPFS (34 vs. 20 months, p = 0.006) and overall survival (97 vs. 33 months, p = 0.003). Patients with serial MCP and IgA levels available prior to progression (n = 195) were used to compare the mPFS using the IMWG and IgA progression criteria. The mPFS using the IgA criteria was 32 (95% CI 29-39) months, versus 39 (95% CI 33-45) months using IMWG criteria. Overall, 92 (47%) patients progressed by both IMWG and IgA criteria. At the time of progression using the IgA criteria compared to at IMWG progression, the median hemoglobin was higher (13.3 vs. 11.6 g/dL, respectively, p < 0.001) and fewer patients had new symptomatic bone lesions (2% vs. 33%, respectively, p < 0.001). Conclusions: In IgA MM patients, monitoring quantitative IgA levels predicts disease response and allows for earlier detection of disease progression, prior to the development of end organ damage.
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Sidana S, Muchtar E, Sidiqi M, Jevremovic D, Dispenzieri A, Gonsalves W, Buadi F, Lacy MQ, Hayman SR, Kourelis T, Kapoor P, Go RS, Warsame R, Leung N, Rajkumar S, Kyle RA, Gertz MA, Kumar SK. Impact of minimal residual negativity using next generation flow cytometry on outcomes in light chain amyloidosis. Am J Hematol 2020; 95:497-502. [PMID: 32010993 PMCID: PMC8019396 DOI: 10.1002/ajh.25746] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 01/27/2020] [Indexed: 12/20/2022]
Abstract
We evaluated bone marrow minimal residual disease (MRD) negativity in 44 patients with light chain (AL) amyloidosis using next generation flow cytometry (sensitivity ≥1 × 10-5 ; median events analyzed: 8.7 million, range: 4.8 to 9.7 million). All patients underwent MRD testing in 2 years from start of therapy (median: 7 months). The overall MRD negative rate was 64% (n = 28). The MRD-negative rate after one-line of therapy was 71% (20/28). And, MRD negative rates were higher with stem-cell transplant as first-line therapy (86%, 18/21) vs chemotherapy alone as first-line treatment (29%, 2/7), P = .005. The MRD negative rate amongst patients in complete response was 75% (15/20), and in very good partial response, 50% (11/22). There were two patients in partial response/rising light chains (with renal dysfunction) who were MRD negative. There were no differences in baseline characteristics of MRD negative vs MRD positive patients, except younger age amongst MRD-negative patients. Patients with MRD negativity were more likely to have achieved cardiac response at the time of MRD assessment, 67% (8/12) vs 22% (2/7), P = .04. Renal response rates were similar in both groups. Progression free survival was assessed in the 42 patients achieving CR or VGPR. After median follow-up of 14 months, the estimated 1-year progression free survival in MRD negative vs MRD positive patients was 100% (26 patients, 0 events) vs 64% (16 patients, five events), P = .006, respectively. MRD assessment should be explored as a surrogate endpoint in clinical trials and MRD risk-adapted trials may help optimize treatment in AL amyloidosis.
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Miller KC, Timm M, Jevremovic D, Gertz M, Buadi F, Hayman SR, Lacy MQ, Dispenzieri A, Dingli D, Kapoor P, Gonsalves WI, Kourelis T, Muchtar E, Hogan WJ, Kumar S. The Impact of Proliferating Polyclonal Plasma Cells on Outcome after Autologous Stem Cell Transplantation in Multiple Myeloma. Biol Blood Marrow Transplant 2020. [DOI: 10.1016/j.bbmt.2019.12.485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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73
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Gonsalves WI, Jevremovic D, Nandakumar B, Dispenzieri A, Buadi FK, Dingli D, Lacy MQ, Hayman SR, Kapoor P, Leung N, Fonder A, Hobbs M, Hwa YL, Muchtar E, Warsame R, Kourelis TV, Russell S, Lust JA, Lin Y, Go RS, Siddiqui MA, Kyle RA, Gertz MA, Rajkumar SV, Kumar SK. Enhancing the R-ISS classification of newly diagnosed multiple myeloma by quantifying circulating clonal plasma cells. Am J Hematol 2020; 95:310-315. [PMID: 31867775 DOI: 10.1002/ajh.25709] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 12/06/2019] [Accepted: 12/12/2019] [Indexed: 12/31/2022]
Abstract
Our prior studies identified the prognostic significance of quantifying cPCs by multiparametric flow cytometry (MFC) in newly diagnosed multiple myeloma (NDMM) patients. We evaluated if a similar quantification of cPCs could add prognostic value to the current R-ISS classification of 556 consecutive NDMM patients seen at the Mayo Clinic, Rochester from 2009 to 2017. Those patients that had ≥5 cPCs/μL and either R-ISS stage I or stage II disease were re-classified as R-ISS IIB stage for the purposes of this study. The median time to next therapy (TTNT) and overall survival (OS) for patients with ≥5 cPCs/μL at diagnosis was as follows: R-ISS I (N = 110) - 40 months and not reached; R-ISS II (N = 69) - 30 and 72 months; R-ISS IIB (N = 96) - 21 and 45 months and R-ISS III (N = 281) - 20 and 47 months respectively. Finally, ≥ 5 cPCs/μL retained its adverse prognostic significance in a multivariable model for TTNT and OS. Hence, quantifying cPCs by MFC can potentially enhance the R-ISS classification of a subset of NDMM patients with stage I and II disease by identifying those patients with a worse than expected survival outcome.
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Parmar HV, Al Saleh AS, Visram A, Warsame R, Kourelis T, Gonsalves WI, Dingli D, Muchtar E, Hayman SR, Kapoor P, Buadi F, Dispenzieri A, Lacy MQ, Gertz M, Kumar S. Implications of a Rising Serum Monoclonal Protein and Free Light Chains Post Autologous Stem Cell Transplant in Patients with Multiple Myeloma. Biol Blood Marrow Transplant 2020. [DOI: 10.1016/j.bbmt.2019.12.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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75
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Muchtar E, Dispenzieri A, Jevremovic D, Dingli D, Buadi FK, Lacy MQ, Gonsalves W, Warsame R, Kourelis TV, Hayman SR, Kapoor P, Leung N, Russell S, Lust JA, Lin Y, Go RS, Zeldenrust S, Kyle RA, Rajkumar SV, Kumar SK, Gertz MA. Survival impact of achieving minimal residual negativity by multi-parametric flow cytometry in AL amyloidosis. Amyloid 2020; 27:13-16. [PMID: 31544536 PMCID: PMC7372715 DOI: 10.1080/13506129.2019.1666709] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Response assessment in light chain (AL) amyloidosis is challenging given the low level of circulating free light chains usually seen. Multi-parametric flow cytometry (MFC) from a marrow aspirate was demonstrated to retain a prognostic significance in several recent studies. In this work, 82 AL patients who had MFC study at end of therapy were analysed based on whether clonal plasma cells were detected or not. Among patients who achieved deep response (i.e. very good partial response or complete response) to first-line therapy, lack of clonal marrow plasma cells as measured by MFC was associated with improved progression-free survival (PFS) compared to patients with residual clonal plasma cells (3-year PFS 88% vs. 46%, p = .003), particularly among patients who achieved a complete response (3-year PFS 100% vs. 33%, p = .001). Absence of clonal plasma cells by MFC compared with patients with detectable clonal plasma cells among deep responders was associated with lower level of involved light chain (involved free light chain (iFLC), median 1.1 vs. 1.7 mg/dL; p = .02) and higher frequency of renal response (100% vs. 68%; p = .005). Further studies are needed to determine if MFC should be incorporated into response criteria in AL amyloidosis.
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