RAEB-1 with Erythroid Hyperplasia and Erythroleukemia Share Clinico-Biological Features and Outcome: A Same Disease with Different Labels?

Blood ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 2866-2866
Author(s):  
Xavier Calvo ◽  
Leonor Arenillas ◽  
Mar Tormo ◽  
David Valcárcel ◽  
Elisa Luño ◽  
...  
Keyword(s):  
Board Of Directors ◽  
Research Funding ◽  
De Novo ◽  
Erythroid Cell ◽  
Advisory Committees ◽  
Biological Features ◽  
Erythroid Hyperplasia ◽  
Group 2 ◽  
Group 1 ◽  
Who 2008

Abstract Introduction: Based on the 2008 World Health Organization classification (WHO 2008), erythroleukemia is defined by the presence of ≥50% erythroid precursors in bone marrow (BM) and ≥20% myeloblasts in the non-erythroid cell population. Multilineage dysplasia is almost always present with high rates of MDS-like cytogenetic abnormalities, specially complex karyotypes. Therefore an extensive comparison with myelodysplastic syndromes (MDS) with ≥50% erythropoesis seems crucial to elucidate whether erythroleukemia and MDS with erythroid hyperplasia should be considered as different biological entities. Aim: To elucidate this issue, the outcome and cytogenetic alterations of erythroleukemia patients were studied and compared to MDS patients with ≥50% erythropoesis with <5% BM blasts (RA, RARS, CRDM, MDS-U) or those with ≥5%-<10% (RAEB-1). In this subset of patients, the diagnosis of RAEB-2 is not possible because those with ≥50% erythropoesis and ≥10% BM blasts were formally diagnosed with erythroleukemia when the blast percentage was assessed in the non-erythroid cell population. Methods: We retrospectively analyzed 448 de novo MDS with ≥50% erythropoesis and 59 de novo erythroleukemias from the MDS Spanish registry (RESMD). Diagnosis was done according to WHO 2008 and patients with ≥80% erythropoiesis with less than 20% of myeloblasts in the non-erythroid cell compartment were excluded assuming a diagnosis of pure erythroid leukemia. Results: Median age of presentation was 74 years (25-94 years), median follow-up was 29.4 months, 63% were males. Median overall survival (OS) of MDS patients with ≥50% erythropoiesis and <5% of BM blasts (n=389; group-1) was significantly longer than MDS with ≥50% erythropoiesis and ≥5%-<10% (n=59; group-2/RAEB-1) (69 months vs. 18 months, p <0.001). Although erythroleukemia patients (n=59) presented a shorter median OS than group-1 patients (69 months vs. 14.5 months, p <0.001), there was no significant differences compared to group-2 patients (RAEB-1) (18 months vs. 14.5 months, p =0.679). Figure 1. Percentage of abnormal karyotypes was significantly higher in the group-2 and EL vs. group-1 but there was no significant differences between group-2 and erythroleukemia (56.9% vs. 44.1%, p =0.165). Moreover no significant differences were observed in the percentage of high-risk karyotypes defined by the IPSS (complex karyotype, chromosome 7 abnormalities) between RAEB-1 and erythroleukemia (30.5% vs. 23.7%, p =0.408). Finally, the presence of a high-risk IPSS karyotype was capable to discriminate two risk groups in the subset of patients with ≥5% BM blasts (RAEB-1 and erythroleukemia). Figure 2. Conclusion: Erythroleukemia and RAEB-1 with ≥50% erythropoiesis share clinico-biological features and outcome. Our findings suggest that erythroleukemia is a continuum of MDS with erythroid hyperplasia and karyotype rather than an arbitrary blast cut-off is the main prognostic marker in this subset of patients. Figure 1. Figure 1. Figure 2. Figure 2. Disclosures Valcárcel: Celgene Corporation: Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Amgen: Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees; GlaxoSmithKline: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau. Díez-Campelo:Celgene: Research Funding, Speakers Bureau; Novartis: Research Funding, Speakers Bureau; Janssen: Research Funding. Ramos:GlaxoSmithKline: Honoraria; Janssen-Cilag: Honoraria, Membership on an entity's Board of Directors or advisory committees; Novartis: Consultancy, Honoraria; Celgene Corporation: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; Amgen: Consultancy, Honoraria.

scholarly journals Patient-Specific Risk Factors Independently Influence Survival in Myelodysplastic Syndromes in an Unbiased Review of EHR Records

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 5440-5440
Author(s):  
Travis Spaulding ◽  
Nicholas Strayer ◽  
Andrew Sochacki ◽  
Shannon Stockton ◽  
Alexander Silver ◽  
...  
Keyword(s):  
Risk Factors ◽  
Board Of Directors ◽  
Research Funding ◽  
Health Record ◽  
Comorbid Conditions ◽  
Comorbid Disease ◽  
Advisory Committees ◽  
Study Population ◽  
Group 2 ◽  
Group 1

Background: Myelodysplastic syndromes (MDS) are clonal hematologic neoplasms stratified by risk by the international prognostic scoring system (IPSS) and IPSS-revised (IPSS-R) which measure risk by morphologic dysplasia, clinical cytopenias, blast count, and cytogenetic abnormalities. (PMID: 9058730, 22740453) The IPSS/IPSS-R do not consider clinical comorbid conditions, though MDS patients with higher burden of comorbid disease have higher rates of non-leukemic death, particularly those with cardiovascular and pulmonary disease. (19324411) Despite this, there has been limited investigation into how specific comorbid conditions may help define subgroups of patients with MDS. Methods: We identified 2676 cases of MDS as defined by ICD-9 code (238.72 - 238.75) in Vanderbilt's Synthetic Derivative (SD). The SD is a de-identified electronic health record (EHR) of over 2.2 million patients with a companion biorepository of DNA (BioVU) for a subset of these patients, including all of the patients with MDS. The 2676 cases were matched by age, gender, race, burden of comorbidities in EHR, and age at last appointment in EHR with 5287 controls. ICD-9 codes for other myeloid disease (e.g., myeloproliferative neoplasms, acute myeloid leukemia) or history of hematopoietic stem cell transplant were excluded among the controls. Characterization of comorbidities, via phecode analysis, was conducted on all cases and controls. Phecodes are groups of related ICD-9 codes describing a clinical syndrome or medical problem, previously demonstrated to be useful in phenome-wide associated studies in EHRs. (28686612) A case was defined as having a phecode only if a representative ICD-9 code was present on two distinct days in the EHR. Next, a cluster analysis of the study population and their associated comorbidities, via a bipartite stochastic block model, was completed, and the study population was organized into hierarchical structure based upon the similarities in comorbidity patterns among patients. Results: ICD-9 codes from the study population made up 181 phecodes, which were found in hierarchical cluster analysis to further cluster into 54 sub-groups and 16 larger groups. MDS patients clustered throughout all groups, the majority of which contained control patients; yet some MDS cases sub-clustered into groups that included a majority of MDS cases and these were further analyzed. Notably, two groups had equivalent size and MDS status were found to have significant differences in phecode profiles. Group 1 had 795 total patients with 783 MDS cases (98.5%) and Group 2 had 769 total patients with 684 MDS cases (88.9%), as per Fig 1a. There were no significant difference in sex between the two groups. Group 1 patients were significantly younger than Group 2 patients (58.3y vs 62.9y; p = 1.36 x 10-7), yet tended have increased risk of renal, cardiovascular and thromboembolic disease than Group 2, as per Fig 1b. Additionally, a higher proportion of Group 2 patients (695/769 or 90.4%) were alive at time of data extraction than Group 1 patients (451/795 or 56.7%) (OR 4.51, p = <2.2 x 10-16). Conclusions: By performing a phenome-wide analysis of patients with MDS in a large electronic health record (EHR), we reveal specific subgroups of MDS patients with distinct comorbidities and different survival, not affected by age or sex. This study demonstrates the ability to study comorbid conditions of MDS patients in an unbiased fashion, independent of disease specific risk factors that inform IPSS-R and which have historically been most important in stratifying risk in MDS. The role of comorbidity is instinctually clear to the adroit clinician, and this technique could provide distinct comorbid disease patterns which impute risk, or perhaps etiology in MDS. Disclosures Savona: TG Therapeutics: Membership on an entity's Board of Directors or advisory committees, Research Funding; Incyte Corporation: Membership on an entity's Board of Directors or advisory committees, Research Funding; Karyopharm Therapeutics: Consultancy, Equity Ownership, Membership on an entity's Board of Directors or advisory committees; Selvita: Membership on an entity's Board of Directors or advisory committees; Takeda: Membership on an entity's Board of Directors or advisory committees, Research Funding; Sunesis: Research Funding; AbbVie: Membership on an entity's Board of Directors or advisory committees; Boehringer Ingelheim: Patents & Royalties; Celgene Corporation: Membership on an entity's Board of Directors or advisory committees.

scholarly journals Exploration of Survival Stratification of Patients with Multiple Myeloma after First Relapse Using Real World Data

Blood ◽  
2016 ◽  
Vol 128 (22) ◽  
pp. 2417-2417 ◽  
Author(s):  
Roman Hájek ◽  
Jiri Jarkovsky ◽  
Walter Bouwmeester ◽  
Maarten Treur ◽  
Lucy DeCosta ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Board Of Directors ◽  
Research Funding ◽  
Treatment Decision ◽  
Advisory Committees ◽  
Patient Risk ◽  
First Relapse ◽  
Survival Expectations ◽  
Group 2 ◽  
Group 1

Abstract Risk stratification tools in multiple myeloma (MM), such as the International Staging System (ISS) and the revised-ISS (R-ISS), have improved understanding of survival expectations using the strongest known predictors at time of diagnosis. Given their value at diagnosis, these have been used to define risk after first relapse in clinical trials and standard practice. Although these tools have not been validated in this setting, their use arises because of the need to better characterize patients in order to define survival expectations and treatment decisions. Once the patient has relapsed, there are additional variables that may need to be considered in order to systematically assess patient risk, understand drivers of disease progression and ensure that treatment strategies are aligned with patient risk. Using data from the Czech Registry of Monoclonal Gammopathies (RMG), this study assessed predictors of overall survival (OS) and developed a new Risk Stratification Tool (RST) to predict OS at time of treatment decision after first relapse (TTD1). The RST was developed by estimating the strongest predictors of OS at both diagnosis and TTD1 to define the final parameters for inclusion. The cut-offs for each parameter reflect conventional cut-offs used in clinical practice and some were supported by evidence using a K-adaptive Partitioning for Survival (KAPS) approach, which stratified data based on distinct survival expectations. The hazard ratio (HR) of the selected predictors was used to assign a score per parameter at a patient level where missing data were entered with a contribution equal to 1. Using the full RMG data set at TTD1 (N=1418) the (KAPS) method was run to define 4 distinct group of patients based on survival expectations. The RST consists of 4 dimensions and 12 item questions based on the strongest predictors of survival at TTD1, "Patient Factors" (age and Eastern Cooperative Oncology Group (ECOG) performance status), "Existing Stratification Factors (R-ISS at diagnosis and ISS at TTD1), "Disease Factors" (calcium level, number of bone lesions, extramedullary disease, thrombocyte count, clonal cells in bone marrow aspiration cytology, lactate dehydrogenase [LDH]) and "Treatment history" (refractory to prior therapy, time-to-next-treatment [from initiation of treatment of first anti-myeloma drug to initiation of treatment at first relapse]) (Table 1). Subsequently, we explored each group based on distribution of frailty-driven measures (age and ECOG) and aggressiveness of the disease (rest of parameters) to understand what is driving stratification. Figure 1 shows the KM curve of survival after TTD1 for each of the 4 groups estimated by KAPS. The new analysis shows strong differentiation in survival expectations between the 4 groups (Table 2), showing significantly different OS for all groups compared with reference. The median OS and Confidence Intervals per group did not overlap, supported by the positive association of HR across groups. The distribution of the Total Score (Figure 2) is between 1 and 2, which shows sufficient sensitivity to differentiate these groups by survival expectations. The RST can then be split into Frailty Score and Aggressiveness Score (Figure 3a & b) to understand what is driving disease severity. The distribution of these two scores shows that group 1 consists of low patient frailty and low disease aggressiveness, whereas group 4 shows high on both elements. Group 2 has an increased score for frailty and marginal increase in aggressiveness compared with group 1, and group 3 stratification is driven by an increase in aggressiveness over group 2. The analysis showed that predictors, patient's experience of prior treatment and level of disease impact at the point of treatment decision after first relapse provided an initial framework to demonstrate strong differentiation between groups based on patient severity and what is driving patient risk (patient frailty vs aggressiveness of disease). The RST has shown promising results when applied to the RMG, however further validation of this work is required using other real-world and clinical trials data. Nevertheless, this analysis is a first step in systematically assessing patient risk to improve the selection of treatments based on improved understanding of patient profiles. Disclosures Hájek: Amgen: Consultancy, Honoraria, Research Funding; Janssen: Honoraria; BMS: Honoraria; Takeda: Consultancy; Celgene: Consultancy, Research Funding. Bouwmeester:Amgen: Consultancy. Treur:Amgen: Consultancy. DeCosta:Amgen: Employment, Other: Holds Amgen Stock. Campioni:Amgen: Employment, Other: Holds Amgen Stock. Delforge:Janssen: Honoraria; Celgene: Honoraria; Amgen: Honoraria. Raab:BMS: Consultancy; Celgene: Membership on an entity's Board of Directors or advisory committees; Janssen: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Novartis: Consultancy, Research Funding; Amgen: Consultancy, Research Funding. Schoen:Amgen: Employment, Other: Holds Amgen Stock. Szabo:Amgen: Employment, Other: Holds Amgen Stock. Lucie:Amgen: Consultancy. Gonzalez-McQuire:Amgen: Employment, Other: Holds Amgen Stock.

scholarly journals Acute Myeloid Leukemia with Myelodisplasia-Related Changes (AML-MRC) Defined Only By Morphological Findings May Not Represent a Poor Prognosis AML

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 2612-2612
Author(s):  
Ana Pérez ◽  
Olga Salamero ◽  
Helena Pomares ◽  
Maria Julia Montoro ◽  
Montserrat Arnan Sangerman ◽  
...  
Keyword(s):  
Overall Survival ◽  
Board Of Directors ◽  
Myeloid Leukemia ◽  
Research Funding ◽  
Poor Prognosis ◽  
Advisory Committees ◽  
Group 3 ◽  
Group 2 ◽  
Acute Myeloid ◽  
Group 1

According to the 2016 WHO classification, AML-MRC encompasses an heterogeneous group of acute myeloid leukemias (AML) comprising: AML emerged from a previous myelodysplastic syndrome (MDS) or myeloproliferative /myelodysplastic disease (group 1), AML with MDS-defining cytogenetic abnormalities (group 2), or acute myeloid leukemia (AML) with dysplasia in at least 2 cell lineages without the above mentioned (group 3). In spite that AML-MRC has been considered a high-risk entity with poor prognosis, little is known on the relationship of clinical and biological characteristics with outcomes in these three groups. The aim of this study was to describe the clinical and biological characteristics of patients with AML-MRC and analyze their prognostic variables and outcomes. We retrospectively analyzed AML-MRC cases diagnosed between January-2009 and December- 2018 in two institutions. Descriptive variables were studied to compare the three AML-MRC groups. AML cytogenetic risk and response were defined according to the European Leukemia Net recommendations. Overall survival (OS) was considered as the time from the diagnosis to the last visit. Survival analysis were performed with Kaplan Meier method and comparisons with the log-rank test. Among 575 cases of AML identified, 186 (32.3%) met AML-MRC criteria and were included in the study. The main patient characteristics are shown in Table1. Median age was 72 (range, 22-88) years and 32% were female. Adverse karyotype was present in 29% of patients, being more prevalent in the AML-MRC group 2. Sixty one patients (33%) received an intensive chemotherapy approach and 36 (19%) an allogeneic stem cell transplantation. Patients in group 3 exhibit a higher probability of achieving a complete response than groups 1 and 2 (Table 2). After a median follow-up for survivors of 28.5 months (range, 5-130), 149 (80%) died in this period. Three years Overall Survival (OS) for patients in groups 1, 2 and 3 was 3 (0-117), 5 (0-93) and 10 (0-130) months, respectively (p=0.012) (Figure 1). Type of treatment (intensive, non intensive or best supportive care) and cytogenetic risk also showed impact on OS. Multivariant analysis adjusting these factors showed that patients in group 3 also presented better OS than patients in group 1 (HR=0,42 [IC95% 0,18-0,84], p=0,02), both with around a 30% of patients with adverse cytogenetics. To conclude the present study suggests that group 3 of AML-MRC, for which the diagnosis is based solely on morphologic findings, showed better prognosis than the other groups. A more detailed molecular characterization might contribute to improve prognostic stratification of this heterogeneous AML entity, particularly in patients with non-high risk cytogenetics. Disclosures Salamero: Pfizer: Honoraria; Daichii Sankyo: Honoraria; Celgene: Honoraria; Novartis: Honoraria. Valcárcel:Jazz Pharmaceuticals: Honoraria; Novartis: Consultancy, Honoraria, Speakers Bureau; Amgen: Consultancy, Honoraria; Celgene: Consultancy, Honoraria, Other: spouse is an employee in the company, Speakers Bureau; Pfizer: Honoraria. Bosch:AstraZeneca: Honoraria, Research Funding; Acerta: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; AbbVie: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Janssen: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Celgene: Honoraria, Research Funding; F. Hoffmann-La Roche Ltd/Genentech, Inc.: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Takeda: Honoraria, Research Funding; Kyte: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Novartis: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau.

scholarly journals Improved Treatment Outcomes for Patients with Hodgkin Lymphoma Relapsing after Autologous Hematopoietic Stem Cell Transplantation in the Brentuximab Vedotin Era - the Real-Life Report from the Polish Lymphoma Research Group

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 5276-5276
Author(s):  
Anna Czyz ◽  
Anna Lojko-Dankowska ◽  
Agnieszka Giza ◽  
Monika Dlugosz-Danecka ◽  
Wojciech Jurczak ◽  
...  
Keyword(s):  
Board Of Directors ◽  
Research Funding ◽  
Salvage Chemotherapy ◽  
Brentuximab Vedotin ◽  
Salvage Treatment ◽  
Study Group ◽  
Advisory Committees ◽  
Historical Group ◽  
Group 2 ◽  
Group 1

Background Brentuximab vedotin (BV) is an effective salvage treatment in patients with relapsing/progressive Hodgkin lymphoma (HL). However, it is unclear how much BV improved the outcome of BV naïve patients who relapsed after autologous hematopoietic stem cell transplantation (autoHCT) in real life. To address this question, we compared the outcome of patients who received conventional salvage treatment before the BV era to those who were treated with BV in haematological centres allied within the Polish Research Study Group. The goals of the study were to compare: the response rates to the conventional salvage chemotherapy and to the BV-based treatment, the proportion of patients proceeding to subsequent allogeneic (allo) or second autologous HCT and finally the overall survival (OS), and progression-free survival (PFS) of relapsing patients after autoHCT treated with and without BV. Methods and study group The study group consisted of adult patients with classical HL relapsing after first autoHCT who were treated either with conventional salvage chemotherapy (between 2001 and 2013; Group 1, n=121) or BV based treatment (between 2012 and 2018; Group 2, n=44). The groups did not differ in terms of age or gender. The patients in Group 2 received more chemotherapy lines before post-transplant salvage treatment (median 3, range 1-6) compared to those in historical Group 1 (median 2, range 1-6) (p=0.013). No patient was treated with immune check points inhibitors. The response to salvage treatment in the majority of patients in historical Group 1 was assessed with conventional computer tomography (CT), while in all patients in Group 2 with CT combined with positron emission tomography. Results The rate of the objective response rate defined as the complete or partial response was higher in Group 2 (84% vs 60%, p<0.001). Of a total of 121 patients in Group 1, 34 (28%) proceeded to the second autoHCT, and 27 (22%) to alloHCT, compared to 4 (9%) and 20 (45%) of 44 patients in Group 2, respectively (p=0.004). The median follow-up time of survivors is longer in the historical Group 1 compared to Group 2 (40 months vs 19 months, p <0.001). However, at 2 years after the start of post-transplant salvage treatment, the estimated OS for patients in Group 1 was 55.2 % (95 % CI 45.8-64.3 %) compared to 81.9 % (95 % CI 66.5-91.2 %) for patients treated with BV (p=0.009) (figure). The respective estimated 2-year PFS was 41.2% (95 % CI 32.3-50.8 %) for Group 1 and 56.2% (95 % CI 38.5-72.4 %) for Group 2 (p=0.038). Importantly, the OS of patients who proceeded to alloHCT after BV-based salvage treatment was statistically significantly better compared to patients treated with alloHCT in the historical pre-BV group (2-year OS 81% vs 55%, p< 0.001). Conclusions In the era of brentuximab vedotin, significantly more patients with HL relapsing after autoHCT achieve objective response and proceed to allogeneic HCT. This most likely translates to the better PFS exceeding 24 months and most importantly to the significantly better OS of patients treated with BV compared to those treated with conventional salvage chemotherapy in the pre-BV era. Figure Disclosures Czyz: Takeda: Honoraria, Membership on an entity's Board of Directors or advisory committees. Dlugosz-Danecka:Roche: Honoraria, Speakers Bureau; Janssen: Consultancy, Honoraria, Speakers Bureau; Macrogenomics: Research Funding; Servier: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau. Jurczak:Gilead: Research Funding; Sandoz: Membership on an entity's Board of Directors or advisory committees, Research Funding; Incyte: Research Funding; Roche: Research Funding; Servier: Research Funding; MorphoSys: Research Funding; Janssen: Membership on an entity's Board of Directors or advisory committees, Research Funding; Loxo: Membership on an entity's Board of Directors or advisory committees, Research Funding; Takeda: Research Funding; AstraZeneca: Membership on an entity's Board of Directors or advisory committees, Research Funding; TG Therapeutics: Research Funding; Novo Nordisk: Research Funding; Bayer: Research Funding; Celtrion: Research Funding. Walewski:Gilead: Other: Travel Expenses; Bristol-Myers Squibb: Consultancy, Membership on an entity's Board of Directors or advisory committees; Janssen: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; Roche: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Travel Expenses, Research Funding; Amgen: Consultancy, 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; Servier: Honoraria; Takeda: Honoraria, Research Funding; GlaxoSmithKline: Research Funding; Incyte: Consultancy, Membership on an entity's Board of Directors or advisory committees. Wrobel:Takeda: Honoraria, Membership on an entity's Board of Directors or advisory committees. Zaucha:Takeda: Honoraria, Membership on an entity's Board of Directors or advisory committees.

scholarly journals Significance of Degree of HLA Disparity When Using Haploidentical Donors with T-Replete PBSC and Post-Transplantation Cyclophosphamide (PTCy) in Acute Myeloid Leukemia (AML) in First Complete Hematologic Remission (CR1)

Blood ◽  
2021 ◽  
Vol 138 (Supplement 1) ◽  
pp. 3910-3910
Author(s):  
Mohamed A. Kharfan-Dabaja ◽  
Myriam Labopin ◽  
Ernesto Ayala ◽  
Ali Bazarbachi ◽  
Didier Blaise ◽  
...  
Keyword(s):  
Board Of Directors ◽  
Cumulative Incidence ◽  
Research Funding ◽  
Acute Gvhd ◽  
Chronic Gvhd ◽  
Hazard Ratio ◽  
Advisory Committees ◽  
Group 2 ◽  
Hla Mismatches ◽  
Group 1

Abstract Background: Haploidentical allogeneic hematopoietic cell transplantation (haplo) has expanded applicability of the procedure to patients for whom a suitable HLA compatible donor was not available in the past. A small multicenter retrospective study of 185 patients with hematologic malignancies who received a nonmyeloablative preparative regimen followed by infusion of bone marrow (BM) hematopoietic cells from haploidentical donors showed no significant association between the number of HLA mismatches (HLA-A, -B, -C, and -DRB1 combined) and risk of acute grade 2-4 graft-versus-host disease (GVHD) (hazard ratio [HR]=0.89; P=0.68 for 3-4 mismatches vs fewer antigen mismatches). This haploidentical transplant platform has certainly evolved. Nowadays, G-CSF mobilized peripheral blood stem cells (PBSC) are commonly used owing to its increased convenience vis-à-vis performing a BM harvest. Study population: Here, we evaluate post transplant outcomes when using haploidentical donors with T-replete PBSC and PTCy in AML in CR1. A total of 494 patients (4/8 HLA mismatch (group 1)=360, 2-3/8 HLA mismatch (group 2)=134) underwent the procedure at an EBMT participating center. The primary endpoints were cumulative incidences of grade 2-4 acute GVHD and chronic (all grades) GVHD. Secondary endpoints included cumulative incidence of relapse (RI), non-relapse mortality (NRM), leukemia-free (LFS) and overall survival (OS) and GVHD-free relapse-free survival (GRFS). Results: Group 1 and group 2 were not statistically different in regards to median age at allografting (54.1 vs. 56.1 years, p=0.51), median year of haplo transplantation (2018 vs. 2018, p=0.36), incidence of de novo AML (86.4% vs. 88.1%, p=0.63), Karnofsky equal or more than 90 (77.5% vs. 79.1%, p=0.70), and use of myeloablative conditioning (MAC) (44.7% vs. 48.5%, p=0.45). Patients in group 1 had a longer time from diagnosis to haplo-transplantation (5.3 vs. 4.9 months, p=0.03). In multivariate analysis, group 1 and group 2 did not differ in cumulative incidence of grade 2-4 acute GVHD (Hazard ratio (HR)=0.89 (95%CI=0.62-1.26), p=0.51) but group 1 had a significantly higher incidence of chronic (all grades) GVHD (HR=1.49 (95%CI=1.02-2.16), p=0.04). There was no difference in RI (HR=0.73 (95%CI=0.47-1.14), p=0.17), NRM (HR=1.25 (95%CI=0.78-2.02), p=0.36), LFS (HR=0.95 (95%CI=0.69-1.31), p=0.76), OS (HR=1.09 (95%CI=0.76-1.55), p=0.64) and GRFS (HR=1.07 (95%CI=0.81-1.42), p=0.64) between the groups. Presence of adverse cytogenetics was independently associated with higher RI (HR=1.90 (95%CI=1.20-2.99), p=0.006), inferior LFS (HR=1.59 (95%CI=1.15-2.19), p=0.005), inferior OS (HR=1.48 (95%CI=1.05-2.08), p=0.03), and worse GRFS (HR=1.54 (95%CI=1.17-2.04), p=0.002). Conclusion: Results show that patients undergoing haplo-transplantation with 4/8 (vs. 2-3/8) HLA mismatches have a higher incidence of chronic GVHD (all grades) without adversely affecting acute grade 2-4 GVHD, RI, LFS, OS and GRFS. Disclosures Labopin: Jazz Pharmaceuticals: Honoraria. Bazarbachi: Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Roche: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Amgen: Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Abbvie: Honoraria, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Hikma: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Janssen: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Pfizer: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Takeda: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau; Astra Zeneca: Membership on an entity's Board of Directors or advisory committees. Blaise: Jazz Pharmaceuticals: Honoraria. McDonald: BioCryst Pharmaceuticals: Honoraria, Membership on an entity's Board of Directors or advisory committees. Forcade: Novartis: Other: travel grant. Ciceri: IRCCS Ospedale San Raffaele: Current Employment. Mohty: Takeda: Honoraria; Astellas: Honoraria; Adaptive Biotechnologies: Honoraria; Novartis: Honoraria; Celgene: Honoraria, Research Funding; Bristol Myers Squibb: Honoraria; Sanofi: Honoraria, Research Funding; Janssen: Honoraria, Research Funding; Gilead: Honoraria; Jazz: Honoraria, Research Funding; Pfizer: Honoraria; Amgen: Honoraria.

scholarly journals Long-Term Experience with Large Granular Lymphocytic Leukemia Evolving after Solid Organ and Hematopoietic Stem Cell Transplantation

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 1226-1226
Author(s):  
Hassan Awada ◽  
Reda Z. Mahfouz ◽  
Jibran Durrani ◽  
Ashwin Kishtagari ◽  
Deepa Jagadeesh ◽  
...  
Keyword(s):  
Board Of Directors ◽  
Research Funding ◽  
Viral Infections ◽  
De Novo ◽  
Post Transplantation ◽  
Advisory Committees ◽  
Hematopoietic Stem ◽  
Post Transplant ◽  
Stat3 Mutations

T-cell large granular lymphocyte leukemia (T-LGLL) is a clonal proliferation of cytotoxic T lymphocytes (CTL). T-LGLL mainly manifest in elderly and is associated with autoimmune diseases including rheumatoid arthritis (RA), B cell dyscrasias, non-hematologic cancers and immunodeficiency (e.g., hypogammaglobulinemia). LGL manifestations often resemble reactive immune processes leading to the dilemmas that LGLs act like CTL expansion during viral infections (for example EBV associated infectious mononucleosis). While studying a cohort of 246 adult patients with T-LGLL seen at Cleveland Clinic over the past 10 years, we encountered 15 cases of overt T-LGLL following transplantation of solid organs (SOT; n=8) and hematopoietic stem cell transplantation (HSCT; n=7). Although early studies reported on the occurrence of LGL post-transplant, these studies focused on the analysis of oligoclonality skewed reactive CTL responses rather than frank T-LGLL. We aimed to characterize post-transplantation T-LGLL in SOT and HSCT simultaneously and compare them to a control group of 231 de novo T-LGLL (cases with no history of SOT or HSCT). To characterize an unambiguous "WHO-defined T-LGLL" we applied stringent and uniform criteria. All cases were diagnosed if 3 out of 4 criteria were fulfilled, including: 1) LGL count >500/µL in blood for more than 6 months; 2) abnormal CTLs expressing CD3, CD8 and CD57 by flow cytometry; 3) preferential usage of a TCR Vβ family by flow cytometry; 4) TCR gene rearrangement by PCR. In addition, targeted deep sequencing for STAT3 mutations was performed and charts of bone marrow biopsies were reviewed to exclude other possible conditions. Diagnosis was made 0.2-27 yrs post-transplantation (median: 4 yrs). At the time of T-LGLL diagnosis, relative lymphocytosis (15-91%), T lymphocytosis (49-99%) and elevated absolute LGL counts (>500 /µL; 93%) were also seen. Post-transplantation T-LGLL were significantly younger than de novo T-LGLL, (median age: 48 vs. 61 yr; P<.0001). Sixty% of post-transplantation T-LGLL patients were males. Fifteen% of patients had more cytogenetic abnormalities compared to de novo T-LGLL, had a lower absolute LGL count (median: 4.5 vs. 8.5 k/µL) and had less frequent neutropenia, thrombocytopenia and anemia (27 vs. 43%, 33 vs. 35% and 20% vs. 55%; P=.01). TCR Vb analysis identified clonal expansion of ≥1 of the Vb proteins in 60% (n=9) of the patients; the remaining 40% (n=6) of the cases had either a clonal process involving a Vb protein not tested in the panel (20%; n=3) or no clear expansion (20%; n=3). Signs of rejection were observed in 20% (n=3/15) and GvHD in 13% (n=2/15) of the patients. Post-transplantation, 27% of cases presented with neutropenia (absolute neutrophil count <1.5 x109/L; n=4), 33% with thrombocytopenia (platelet count <150 x109/L; n=5) and 25% with anemia (hemoglobin <10 g/dL; n=3). T-LGLL evolved in 10 patients (67%; 10/15) despite IST including cyclosporine (n=5), tacrolimus (n=4), mycophenolate mofetil (n=5), cyclophosphamide (n=1), anti-thymocyte globulin (n=1), and corticosteroids (n=6). Lymphadenopathy and splenomegaly were seen in 13% (n=2) and 33% (n=5) of the patients. Other conditions observed were MGUS (20%; n=3) and RA (7%; n=1). Conventional cytogenetic showed normal karyotype in 89% (n=11, tested individuals 13/15). Somatic STAT3 mutations were identified in 2 patients. Sixty% of cases (n=9) were seropositive for EBV when tested at different time points after transplant. Similarly, 53% (n=8) were seropositive for CMV, of which, 5 were positive post-transplantation and 3 pre-/post-transplantation. The complexity of T-LGLL expansion post-transplantation might be due to several mechanisms including active viral infections, latent oncogenic viral reactivation and graft allo-antigenic stimulation. However, in our cohort graft rejection or GvHD was encountered in a few patients (2 allo-HSCT recipients). Autoimmune conditions were present in 50% of SOT recipients (n=4/ 8, including RA, ulcerative colitis, systemic lupus erythematosus). Some of our patients also had low immunoglobulin levels. Overt EBV (post-transplant lymphoproliferative disorder) and CMV reactivation was diagnosed in only 27% (4/15) of the patients. In sum we report the long term follow up of a cohort of T-LGLL and emphasize the expansion of T-LGLL post-transplant highlighting the difficulty in assigning one unique origin of LGLL. Disclosures Hill: Genentech: Consultancy, Research Funding; Takeda: Research Funding; Celegene: Consultancy, Honoraria, Research Funding; Kite: Consultancy, Honoraria; Abbvie: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; Seattle Genetics: Consultancy, Honoraria; Amgen: Research Funding; Pharmacyclics: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; Gilead: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees; TG therapeutics: Research Funding; AstraZeneca: Consultancy, Honoraria. Majhail:Atara Bio: Consultancy; Mallinckrodt: Honoraria; Nkarta: Consultancy; Anthem, Inc.: Consultancy; Incyte: Consultancy. Sekeres:Syros: Membership on an entity's Board of Directors or advisory committees; Millenium: Membership on an entity's Board of Directors or advisory committees; Celgene: Membership on an entity's Board of Directors or advisory committees. Maciejewski:Alexion: Consultancy; Novartis: Consultancy.

Incidence Of Hypotension In Patients With Multiple Myeloma During High Dose Chemotherapy and Autologous Stem Cell Rescue

Blood ◽  
2013 ◽  
Vol 122 (21) ◽  
pp. 3324-3324 ◽  
Author(s):  
Priya Sehgal ◽  
Noa Biran ◽  
Gagan Sahni ◽  
Ajai Chari
Keyword(s):  
Board Of Directors ◽  
Discharge Summary ◽  
Infectious Complications ◽  
High Dose ◽  
Inclusion Criteria ◽  
Advisory Committees ◽  
Gastrointestinal Complications ◽  
Group 2 ◽  
Al Amyloid ◽  
Group 1

Abstract Background The median age of patients diagnosed with multiple myeloma (MM) is 69. Up to 60-80% of patients in this age group have hypertension (HTN) (Burt VL et al. Hypertension 1999), and are on anti-hypertensive medications. A standard treatment for MM is high dose melphalan (HDM) chemotherapy with autologous stem cell transplant (ASCT), which often results in gastrointestinal complications that can result in hypovolemia. The combined effect of anti-HTN agents and ASCT-related complications may result in blood pressure (BP) ranges that are precariously low. To date, the incidence of hypotension in the setting of ASCT for MM is unknown. In this case series of 102 patients who received ASCT for MM, we compare the characteristics of those who became hypotensive with those who did not. Methods We reviewed the charts of 102 consecutive MM/AL amyloid patients admitted for HDM chemotherapy with ASCT at Mount Sinai Hospital between May 2011 and June 2013. May 2011 was chosen as the date of inclusion because at this time, electronic medical records were implemented, allowing for detailed review of vital signs and other clinical data. Patients were classified into two groups. Patients included in group 1 demonstrated a drop in BP which was defined as meeting at least 1 of the following criteria: A) One or more anti-HTN medications were discontinued during ASCT B) Although normotensive on admission for ASCT, the median systolic or diastolic blood pressure (SBP or DBP) on date of discharge was ≤ 100 or 60 mm Hg respectively C) A decrease in SBP of ≥ 20 mm Hg was observed between admission and discharge Patients who did not meet any of the above criteria were classified into group 2. Baseline and peri- SCT characteristics of the two groups were compared using the chi square test. Results Of the 102 patients analyzed, 6 had AL amyloid and the remaining 96 had MM. 43 met at least one inclusion criteria for group 1 and the remaining 59 were classified as group 2. Specifically, of the patients in group 1, 18 met inclusion criteria A, 21 met inclusion criteria B, and 23 met inclusion criteria C. Among the patients in group 1 who met 2 criteria: 4 patients met criteria A and B, 4 patients met criteria A and C, and 9 patients met criteria B and C. Baseline characteristics including median age (64 and 63), gender distribution (55.8% and 47.5% females respectively), and a history of HTN (41.9% vs. 37.3%) were comparable in both groups (p>0.05). The median length of stay was 17 days in both groups. The incidence of gastrointestinal complications was comparable in both groups including diarrhea 72.1% vs. 62.7%, mucositis 14.0 % vs 8. 5%, and Clostridium difficile infection 9.3% vs. 6.8%. The ensuing weight loss in the 2 groups was also comparable 2.4 kg and 1.9 kg respectively. The incidence of infectious complications was similarly comparable in the 2 groups with fever 51.1 % vs 61% and bacteremia occurring in 7.0% vs 11.9%. Of the 43 patients in group 1, one patient had shock requiring ICU transfer for vasopressors in the setting of adrenal insufficiency and sepsis/bacteremia. Interestingly, of the 102 included patients, only 15 were reported to have clinically significant hypotension on the discharge summary. Of these 15 patients, 3 experienced transient hypotension, (i.e. for 1 -2 days,) with rapid normalization of pressure, and therefore, did not meet our inclusion criteria of persistent hypotension. Conclusions Although the incidence of hypotension in this series of MM patients undergoing ASCT was 42%, only 15% had documentation of this occurrence in the discharge summary. Interestingly, there were no statistically significant differences in the risk factors for ASCT associated hypotension in the 2 groups, including gastrointestinal and infectious complications. Given the unexpectedly high incidence of hypotension during ASCT, consideration should be given to the following: 1) Prior to SCT, anti-HTN medications should not be added (as is sometimes done for perioperative clearance) or titrated up; 2) During ASCT, anti-HTN medications may need to be discontinued; 3) Prior to discharge from ASCT, physical therapy/orthostatic evaluation and risk of falls from new relative hypotension needs to be assessed, especially in the setting of recovering thrombocytopenia. Although further studies are required, we hypothesize that fatigue, presyncopal events, and falls post SCT could be minimized with increased attention to HTN management peri ASCT. Disclosures: Chari: Celgene: Consultancy, Membership on an entity’s Board of Directors or advisory committees; Millenium : Membership on an entity’s Board of Directors or advisory committees; Onyx: Membership on an entity’s Board of Directors or advisory committees.

Impact Of The Early Intensification Of Induction Chemotherapy On Complete Remission and Survival Rates For De Novo Adult Acute Myeloid Leukemia

Blood ◽  
2013 ◽  
Vol 122 (21) ◽  
pp. 3402-3402
Author(s):  
Seung-Ah Yahng ◽  
Jae-Ho Yoon ◽  
Sung-Eun Lee ◽  
Seung-Hwan Shin ◽  
Byung-Sik Cho ◽  
...  
Keyword(s):  
Acute Myeloid Leukemia ◽  
Board Of Directors ◽  
Induction Chemotherapy ◽  
Myeloid Leukemia ◽  
Research Funding ◽  
De Novo ◽  
Remission Induction ◽  
Advisory Committees ◽  
Induction Regimen ◽  
Acute Myeloid

Abstract Background The successful induction chemotherapy of acute myeloid leukemia (AML) depends on the ability to achieve complete remission (CR) and to maintain remission status as long as possible. Approach to improve the rate of CR includes the intensification of induction chemotherapy for AML. The primary goal of this study was to evaluate and compare the long-term outcomes between remission induction therapy with and without early intensification added to the standard 3+7 remission induction regimen. Methods A retrospective analysis was performed on de novo AML patients diagnosed and treated at Catholic Blood and Marrow Transplantation Center between January 2001 and December 2010. Six hundred forty-one adults of ages between 16 and 60 were included, all of whom received induction chemotherapy starting with 3 days of idarubicin and 7 days of cytarabine or behenoyl cytarabine (BHAC). Cases with t(9;22) and t(15;17) were excluded. Bone marrow (BM) aspiration study was assessed on day 7 of induction in all patients. Factors which were considered for early intensification of induction were the presence of ≥ 5% BM blasts, patient performance, and other high risk clinical characteristics, such as karyotype. Groups according to early intensification on days 8 to 10 of induction were as followings: no intensification (3+7), n=156; cytarabine or BHAC for 3 days (3+10), n=233; addition of idarubicin for 2 days to 3+10 regimen (5+10), n=252. After a median duration of 5.5 months (3.3-19.0) from diagnosis, 479 patients underwent stem cell transplantation (autologous [auto-SCT], n=144; allogeneic [allo-SCT], n=335). Conditioning regimen for auto-SCT consisted of fractionated total body irradiation (TBI), melphalan, and cytarabine, whereas 83% (n=278) of patients with allo-SCT received myeloablative conditioning, of which was mostly TBI-based regimen (92%). Donors were matched sibling (n=213), matched unrelated (n=63), mismatched unrelated (n=39), and haploidentical related (n=20). Results The median age at diagnosis was 39 years (16-60). Mean values of BM blast % on day 7 of induction was 3.5 in 3+7 group, 7.9 in 3+10, and 33.6 in 5+10 (p=<0.0001), while no significant difference in the proportion of adverse karyotype was shown (11.7% vs. 12.8%, p=0.804). After first induction (3+7, n=165; 3+10/5+10, n=465), the CR/CRi rate was significantly higher in 3+10/5+10 versus 3+7 (78.1% vs. 69.2%, p=0.023), while the rate for death in aplasia was lower (4.3% vs. 9.6%, p=0.013). After re-induction with various regimens, the CR/CRi rate was still significantly higher in intensified group (p=0.012). The relapse rates between the groups in 536 patients achieving CR (83.6%), however, was not significantly different (8.9% vs. 9.9%, p=0.737). SCT was performed at CR1 (n=459), CR2 (n=10), or relapsed/refractory status (n=10). Patients with auto-SCT mostly had better/intermediate cytogenetic risk (96%) at diagnosis, while 12% of allo-SCT had poor karyotype. After the median follow-up duration of 60.2 months (2.2-143.5), the median overall survival (OS) in all patients (n=641) was 65.6 months. The 5-year disease-free survival (DFS) of patients with auto- and allo-SCT was 58.4±4.2 and 64.9±2.7, respectively. Of 334 patients receiving allo-SCT, the 5-year DFS was significantly higher in patients achieving CR1 (n=299) after first induction therapy (p<0.0001), in whom 75% of them had early intensification. Other factors with significant impact on DFS after allo-SCT (n=334) were karyotype at diagnosis (p=0.032) and donor type (HLA-matched vs. HLA-mismatched sibling or unrelated, 58.1%±3.8 vs. 45.1±8.0, p=0.016). The significances were confirmed in multivariate analysis, which demonstrated that achieving CR1 after first induction regimen and its maintenance until SCT was the most powerful predictor for DFS after allo-SCT (67.1±2.9 vs. 34.6±7.8, p=<0.0001). When all patients were analyzed, according to induction intensification, a statistically significant benefit in 10-year OS was observed in 5+10 intensified group (44.8% vs. 52.9%, p=0.032). Conclusion Our results suggest possible benefit of examining day 7 BM aspiration for the strategy of early intensification of induction chemotherapy for adult AML patients and our intensification doses can be safely added with high efficacy in the achievement of CR1 compared to 3+7 standard regimen, and may have affected for better DFS after allo-SCT. Disclosures: Kim: BMS: Consultancy, Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding; Novartis: Consultancy, Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding; Pfizer: Consultancy, Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding.

Efficacy of Single-Agent Decitabine in Relapsed and Primary Refractory (rel/ref) Acute Myeloid Leukemia (AML)

Blood ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 2518-2518
Author(s):  
Andrew Hantel ◽  
Niloufer Khan ◽  
Richard A. Larson ◽  
Lucy A. Godley ◽  
Michael J. Thirman ◽  
...  
Keyword(s):  
Board Of Directors ◽  
Genetic Risk ◽  
Research Funding ◽  
De Novo ◽  
Median Number ◽  
Advisory Committees ◽  
Secondary Aml ◽  
Induction Regimen ◽  
De Novo Aml ◽  
Wbc Count

Abstract Introduction Improving therapy for rel/ref AML remains a challenge. Decitabine, a DNA methyl-transferase inhibitor, initially showed promise in AML as a 5-day, first-line induction regimen and more recently as a 10-day regimen in older and unfit patients (1). However, little is known about the activity of decitabine in the rel/ref patient population despite increased use. Therefore, we sought to analyze the outcomes of these pts treated at our institution. Methods To obtain data regarding decitabine efficacy in rel/ref AML, we performed a retrospective analysis of outcomes following decitabine treatment in 34 adult pts treated at The University of Chicago from January 2009 to June 2014. Permission to access patient charts was granted by the medical centerÕs Institutional Review Board. AML was defined by WHO criteria, genetic risk grouping and complete remission (CR) was according to ELN classification; PR was defined as >50% decrease in bone marrow blasts and normalization of blood counts. Rel/ref AML was defined as either having had a prior CR with recurrence of disease or having received a prior induction regimen (1-2 cycles) without CR. Results Median pt age was 62 yrs (range, 18-81) and 60% were male. Median Charlson comorbidity index (CCI) was 5 (range, 0-8); 29% had ECOG performance status 0-1 and 71% had >2. 21 pts (62%) had de novo AML (7 with myelodysplasia-related changes), 3 (9%) had therapy-related myeloid neoplasm (t-MN), and 10 (29%) had secondary AML after myelodysplastic syndrome. 6% were in the ELN favorable genetic group, 3% intermediate-I, 18% intermediate-II, and 67% adverse; 2 cases were unevaluable. The median number of prior treatment regimens was three. 9% had received prior azacitidine, 85% had received prior HiDAC, and 38% had a prior allogeneic stem cell transplant (SCT). 34 pts received a total of 71 cycles of decitabine, 20 mg/m2 daily, in 5 or 10-day cycles every 28 days. All patients received 10-day courses, 91% had an initial 10-day course, and 74% had only 10-day courses. The median number of cycles per pt was 2; 59% received >1 cycle. 7 (21%) achieved CR and 4 (12%) had a partial response (PR), for an overall response rate (OR) of 33%. Responses occurred in 24% of pts with de novo AML, 66% with t-MN, and 50% with secondary AML. Intermediate and adverse group pts had OR of 14% and 39%, respectively. All pts achieving CR did so after 1 cycle; PR required a median of 3 cycles. Pts who achieved CR or PR had a significantly lower pretreatment WBC count (median, 9.5 vs 49.5 x 103/µL in non-responders; p=0.015) and blast percentage (44 vs 59.4; p=0.035) than those who did not. Pts with secondary AML or t-MN had a higher probability of OR compared to those with de novo AML (54 vs 23%; p=0.042). Median overall survival (OS) of all pts was 256 days; prior SCT was associated with reduced OS (p=0.017). When comparing de novo to secondary AML & t-MN, 1-year OS was not significantly different (Figure 1). Responders had a significantly longer OS (median, 622 days vs 278 days for non-responders; p=0.012). Age, race, CCI, ECOG PS, genetic risk group, prior HiDAC, dysplasia, azacitidine, and number of prior treatments did not impact OR or OS. 16 (47%) pts proceeded to SCT. During treatment, 70% had a grade 3-4 non-hematologic toxicity (based on NCI CTACE v4.0); the most common was fatigue. The median number of hospitalizations for complications per patient was 2 (range, 0-7). Causes of hospitalization were febrile neutropenia (40%), infection (22%), cytopenias (18%), rash (6%), acute kidney injury (6%), and 8% were for other causes. Conclusion Decitabine treatment of 34 adults with rel/ref AML resulted in an OR of 33% (21% CR) and allowed nearly one-half of these pts to proceed to SCT. All pts achieving CR did so after 1 cycle. Responding pts had improved OS over those without response (p=0.012). Interestingly, secondary AML or t-MN were 7.8 times more likely to achieve a response compared to de novo AML (p=0.046); lower WBC count and marrow blast percentage also correlated with higher OR. Further delineation of molecular subsets associated with response to decitabine should be evaluated in a larger prospective trial in this high-risk AML population. Citation 1. Blum KA, et al. Phase I trial of low dose decitabine targeting DNA hypermethylation in patients with chronic lymphocytic leukaemia and non-Hodgkin lymphoma: dose-limiting myelosuppression without evidence of DNA hypomethylation. Br J of Haem. Jul 2010;150(2):189-195. Figure 1. Figure 1. Disclosures Off Label Use: Decitabine is indicated for treatment of MDS but is often used to treat newly diagnosed or relapsed/refractory AML. In this study we analyzed results of patients with AML who were treated with decitabine in the relapsed/refractory setting.. Thirman:AbbVie: Research Funding; Pharmacyclics LLC, an AbbVie Company: Research Funding; Gilead: Research Funding; Merck: Research Funding; AbbVie: Research Funding; Gilead: Research Funding; Merck: Research Funding. Odenike:Sunesis: Membership on an entity's Board of Directors or advisory committees, Research Funding. Liu:Astra Zeneca/Medimmune: Consultancy; Pfizer: Consultancy; Astra Zeneca/Medimmune: Consultancy; Pfizer: Consultancy. Stock:Gilead: Membership on an entity's Board of Directors or advisory committees.

Crispr-Cas9 Saturating Mutagenesis Reveals an Achilles Heel in the BCL11A Erythroid Enhancer for Fetal Hemoglobin Induction (by Genome Editing)

Blood ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 638-638 ◽  
Author(s):  
Daniel E. Bauer ◽  
Matthew C. Canver ◽  
Elenoe C. Smith ◽  
Falak Sher ◽  
Luca Pinello ◽  
...  
Keyword(s):  
Board Of Directors ◽  
Genome Editing ◽  
Genetic Variants ◽  
Research Funding ◽  
Gene Editing ◽  
Fetal Hemoglobin ◽  
Erythroid Cell ◽  
Erythroid Cells ◽  
Advisory Committees ◽  
Hbf Level

Abstract Common genetic variation associated with fetal hemoglobin (HbF) level and β-hemoglobin disorder clinical severity marks an erythroid enhancer within the BCL11A gene. The 12 kb intronic enhancer contains three ~1 kb erythroid DNase I hypersensitive sites (DHSs), termed +55, +58, and +62. Here we utilized a human adult-stage erythroid cell line to show by CRISPR-Cas9 mediated targeted deletion that the composite enhancer is required both for BCL11A expression and HbF repression. Because deletion of the entire enhancer is currently too inefficient to consider for a gene editing approach to hemoglobin disorders, we sought to define the critical features of the enhancer in its natural genomic context. We designed and synthesized a tiling pooled guide RNA (gRNA) library to conduct saturating mutagenesis of the enhancer sequences in situ using the CRISPR-Cas9 gene editing platform. The gRNAs direct Cas9 cleavage and non-homologous end-joining repair at discrete sites throughout the enhancer. By comparing the representation of lentiviral gRNA integrants in high and low HbF pools of the adult erythroid cells, we generated a functional map approaching nucleotide resolution of sequences within the enhancer influencing BCL11A regulation. We observed several discrete enhancer regions required for maximal expression. The largest effect was observed by producing mutations within a narrow functional core of the +58 DHS. These sequences include a GATA1 motif conserved among vertebrates located within a primate-specific context. This region constitutes an Achilles Heel for functional inactivation of the enhancer. We also identified rare genetic variants within the +58 DHS core in individuals with sickle cell disease that are associated with HbF level, independent of all known associations of common genetic variants. In parallel, we performed a similar saturating CRISPR mutagenesis screen of the corresponding murine Bcl11a enhancer. To our surprise, despite low-resolution evidence of conservation by primary sequence homology, syntenic genomic position, and shared chromatin signature, the mouse enhancer sequence determinants of BCL11A expression showed substantial functional divergence. The +58 orthologous sequences were dispensable whereas the +62 orthologous sequences were critically required in murine adult erythroid cells. These results were validated by producing targeted deletions in mouse and human adult erythroid cell lines. Furthermore we subjected cells to individual gRNAs to correlate individual nucleotide disruptions with loss of BCL11A expression. To substantiate the tissue-restricted effect of the enhancer mutations, we generated transgenic mice with deletion of the Bcl11a enhancer and found these sequences were dispensable for expression in developing neurons and B-lymphocytes (unlike conventional Bcl11a knockout) but essential for appropriate hemoglobin switching in vivo. We showed that in primary CD34+ hematopoietic stem and progenitor derived human erythroid precursors that delivery of an individual gRNA and Cas9 is sufficient to produce robust reinduction of HbF. These results validate the BCL11A erythroid enhancer as a promising therapeutic target. Our findings define the most favorable regions for generation of indel mutations in the BCL11A erythroid enhancer as a therapeutic genome editing strategy for HbF reinduction for the β-hemoglobin disorders. Disclosures Bauer: Biogen: Research Funding; Editas Medicine: Consultancy. Zhang:Editas Medicine: Membership on an entity's Board of Directors or advisory committees; Horizon Discovery: Membership on an entity's Board of Directors or advisory committees. Orkin:Editas Medicine: Membership on an entity's Board of Directors or advisory committees; Biogen: Research Funding; Pfizer: Research Funding; Sangamo Biosciences: Consultancy.

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