scholarly journals Outcome of Lower-Risk Patients With Myelodysplastic Syndromes Without 5q Deletion After Failure of Erythropoiesis-Stimulating Agents

2017 ◽  
Vol 35 (14) ◽  
pp. 1591-1597 ◽  
Author(s):  
Sophie Park ◽  
Jean-François Hamel ◽  
Andrea Toma ◽  
Charikleia Kelaidi ◽  
Sylvain Thépot ◽  
...  
Keyword(s):  
Myelodysplastic Syndromes ◽  
Lower Risk ◽  
Retrospective Cohort ◽  
Multivariable Analysis ◽  
Response Duration ◽  
International Prognostic Scoring System ◽  
Second Line ◽  
Median Response ◽  
Erythropoiesis Stimulating Agents ◽  
Erythroid Response

Purpose Most anemic patients with non-deleted 5q lower-risk myelodysplastic syndromes (MDS) are treated with erythropoiesis-stimulating agents (ESAs), with a response rate of approximately 50%. Second-line treatments, including hypomethylating agents (HMAs), lenalidomide (LEN), and investigational drugs, may be used after ESA failure in some countries, but their effect on disease progression and overall survival (OS) is unknown. Here, we analyzed outcome after ESA failure and the effect of second-line treatments. Patients and Methods We examined an international retrospective cohort of 1,698 patients with non-del(5q) lower-risk MDS treated with ESAs. Results Erythroid response to ESAs was 61.5%, and median response duration was 17 months. Of 1,147 patients experiencing ESA failure, 653 experienced primary failure and 494 experienced relapse after a response. Primary failure of ESAs was associated with a higher risk of acute myeloid leukemia (AML) progression, which did not translate into an OS difference. Of 450 patients (39%) who received second-line treatment, 194 received HMAs, 148 received LEN, and 108 received other treatments (MISC), whereas 697 received RBC transfusions only. Five-year AML cumulative incidence was 20.3%, 20.3%, and 11.3% for those receiving HMAs, LEN, and MISC, respectively ( P = .05). Five-year OS for patients receiving HMA, LEN, and MISC was 36.5%, 41.7%, and 51%, respectively ( P = .21). In a multivariable analysis adjusted for age, sex, revised International Prognostic Scoring System score, and progression at ESA failure, there was no significant OS difference among the three groups. Conclusion In this large, multicenter, retrospective cohort of patients with non-del(5q) lower-risk MDS treated with ESAs, none of the most commonly used second-line treatments (HMA and LEN) significantly improved OS. Early failure of ESAs was associated with a higher risk of AML progression.

Randomized Phase III Study of Lenalidomide Versus Placebo in RBC Transfusion-Dependent Patients With Lower-Risk Non-del(5q) Myelodysplastic Syndromes and Ineligible for or Refractory to Erythropoiesis-Stimulating Agents

2016 ◽  
Vol 34 (25) ◽  
pp. 2988-2996 ◽  
Author(s):  
Valeria Santini ◽  
Antonio Almeida ◽  
Aristoteles Giagounidis ◽  
Stefanie Gröpper ◽  
Anna Jonasova ◽  
...  
Keyword(s):  
Myelodysplastic Syndromes ◽  
Lower Risk ◽  
Phase Iii ◽  
International Prognostic Scoring System ◽  
Double Blind Study ◽  
Double Blind ◽  
Erythropoiesis Stimulating Agents ◽  
Endogenous Erythropoietin ◽  
Erythroid Response ◽  
Rbc Transfusion

Purpose This international phase III, randomized, placebo-controlled, double-blind study assessed the efficacy and safety of lenalidomide in RBC transfusion–dependent patients with International Prognostic Scoring System lower-risk non-del(5q) myelodysplastic syndromes ineligible for or refractory to erythropoiesis-stimulating agents. Patients and Methods In total, 239 patients were randomly assigned (2:1) to treatment with lenalidomide (n = 160) or placebo (n = 79) once per day (on 28-day cycles). The primary end point was the rate of RBC transfusion independence (TI) ≥ 8 weeks. Secondary end points were RBC-TI ≥ 24 weeks, duration of RBC-TI, erythroid response, health-related quality of life (HRQoL), and safety. Results RBC-TI ≥ 8 weeks was achieved in 26.9% and 2.5% of patients in the lenalidomide and placebo groups, respectively (P < .001). Ninety percent of patients achieving RBC-TI responded within 16 weeks of treatment. Median duration of RBC-TI with lenalidomide was 30.9 weeks (95% CI, 20.7 to 59.1). Transfusion reduction of ≥ 4 units packed RBCs, on the basis of a 112-day assessment, was 21.8% in the lenalidomide group and 0% in the placebo group. Higher response rates were observed in patients with lower baseline endogenous erythropoietin ≤ 500 mU/mL (34.0% v 15.5% for > 500 mU/mL). At week 12, mean changes in HRQoL scores from baseline did not differ significantly between treatment groups, which suggests that lenalidomide did not adversely affect HRQoL. Achievement of RBC-TI ≥ 8 weeks was associated with significant improvements in HRQoL (P < .01). The most common treatment-emergent adverse events were neutropenia and thrombocytopenia. Conclusion Lenalidomide yields sustained RBC-TI in 26.9% of RBC transfusion–dependent patients with lower-risk non-del(5q) myelodysplastic syndromes ineligible for or refractory to erythropoiesis-stimulating agents. Response to lenalidomide was associated with improved HRQoL. Treatment-emergent adverse event data were consistent with the known safety profile of lenalidomide.

Arsenic Trioxide in Patients With Myelodysplastic Syndromes: A Phase II Multicenter Study

2006 ◽  
Vol 24 (16) ◽  
pp. 2465-2471 ◽  
Author(s):  
Norbert Vey ◽  
Andre Bosly ◽  
Agnes Guerci ◽  
Walter Feremans ◽  
Herve Dombret ◽  
...  
Keyword(s):  
Arsenic Trioxide ◽  
Myelodysplastic Syndromes ◽  
Scoring System ◽  
Lower Risk ◽  
International Prognostic Scoring System ◽  
Risk Category ◽  
Moderate Activity ◽  
Loading Dose ◽  
Median Response ◽  
System Risk

Purpose Evaluation of the safety and efficacy of arsenic trioxide in patients with myelodysplastic syndromes (MDS). Patients and Methods MDS patients diagnosed according to standard French-American-British criteria received a loading dose of 0.3 mg/kg per day of arsenic trioxide for 5 days followed by a maintenance dose of 0.25 mg/kg arsenic trioxide twice weekly for 15 weeks. Patients were divided into two cohorts: lower-risk MDS (International Prognostic Scoring System risk category low or intermediate 1) and higher-risk MDS (International Prognostic Scoring System risk category intermediate 2 or high). Modified International Working Group criteria were used for response evaluation. Results Of 115 patients enrolled and treated in the study, 67% of patients were transfusion dependent at baseline; median age was 68 years. Most treatment-related adverse events were mild to moderate. The overall rate of hematologic improvement (intent-to-treat) was 24 (19%) of 115, including one complete and one partial response in the higher-risk cohort. The hematologic response rates were 13 (26%) of 50 and 11 (17%) of 64 in patients with lower-risk and higher-risk MDS, respectively. Major responses were observed in all three hematologic lineages; 16% of RBC transfusion-dependent patients and 29% of platelet transfusion-dependent patients became transfusion independent. At data cut off, the median response duration was 3.4 months, with responses ongoing in nine patients. Conclusion Arsenic trioxide treatment consisting of an initial loading dose followed by maintenance therapy has moderate activity in MDS, inducing hematologic responses in both lower- and higher-risk patients. This activity combined with a manageable adverse effect profile warrants the additional study of arsenic trioxide, particularly in combination therapy, for the treatment of patients with MDS.

Long-term outcome of treatment of anemia in MDS with erythropoietin and G-CSF

Blood ◽  
2005 ◽  
Vol 106 (3) ◽  
pp. 803-811 ◽  
Author(s):  
Martin Jädersten ◽  
Scott M. Montgomery ◽  
Ingunn Dybedal ◽  
Anna Porwit-MacDonald ◽  
Eva Hellström-Lindberg
Keyword(s):  
Cox Regression ◽  
Response Duration ◽  
Long Term Results ◽  
International Prognostic Scoring System ◽  
Term Outcome ◽  
Median Response ◽  
Long Term Outcome ◽  
Erythroid Response ◽  
Results Of Treatment

AbstractWe report long-term results of treatment of myelodysplastic syndrome (MDS) with erythropoietin and granulocyte colony-stimulating factor (G-CSF). A total of 129 patients were followed up 45 months after last inclusion in the Nordic MDS Group studies. Erythroid response rate was 39% and median response duration 23 months (range, 3-116 months or more). Complete responders showed longer response duration than partial responders (29 versus 12 months, P = .006). The International Prognostic Scoring System (IPSS) groups Low/Intermediate-1 (Low/Int-1) had longer response duration than Int-2/High (25 versus 7 months, P = .002). The time until 25% developed acute myeloid leukemia (AML) was longer in the good and intermediate predictive groups for erythroid response compared with the poor predictive group (52 versus 13 months, P = .008). Only 1 of 20 long-term responders developed AML. We assessed the effect on long-term outcome by comparing treated patients with untreated patients selected from the IPSS database using multivariate Cox regression, adjusting for major prognostic variables. There was no difference in survival (odds ratio [OR], 0.9; 95% confidence interval [CI], 0.7-1.2; P = .55) or risk of AML evolution (OR, 1.3; 95% CI, 0.7-2.2; P = .40) between treated and untreated patients. Patients with high/intermediate probability of response and with IPSS Low/Int-1 show frequent and durable responses without adverse effects on outcome, while other patients should not be considered candidates for this treatment.

Lenalidomide (LEN) In Lower-Risk Myelodysplastic Syndromes (MDS) with Karyotypes Other Than Deletion 5q and Refractory to Erythropoiesis-Stimulating Agents (ESAs)

Blood ◽  
2010 ◽  
Vol 116 (21) ◽  
pp. 4002-4002
Author(s):  
David Sibon ◽  
Giovanna Cannas ◽  
Fiorenza Barraco ◽  
Thomas Prebet ◽  
Norbert Vey ◽  
...  
Keyword(s):  
Median Duration ◽  
Lower Risk ◽  
Conflicts Of Interest ◽  
Response Duration ◽  
Median Response ◽  
Erythroid Response ◽  
Vein Thrombosis ◽  
Transfusion Independence ◽  
Wbc Count ◽  
Rbc Transfusion

Abstract Abstract 4002 Background. In lower-risk MDS, anemia is the main therapeutic challenge. ESAs can frequently correct anemia, but not all pts respond and median response duration to ESAs is only about 2 years. LEN yields RBC transfusion-independence (TI) in 65% of lower risk MDS with del(5q)] and about 25% of lower risk MDS without del 5q (Raza A, et al, Blood, 2008, 111, 1). However, in the last study, pretreatment with ESAs was not always documented, and the efficacy of LEN on anemia of non-del(5q) MDS refractory to ESAs remains unknown. Patients and Methods: 31 consecutive lower-risk non-del(5q) MDS with anemia refractory to ESAs were treated with LEN through a compassionate program. Pts wn@ere from 7 centers of the Groupe Francophone des Myélodysplasies. They had previously received an ESA during at least 12 weeks, including epoetin alfa (80,000 U qw, n= 17), epoetin beta (60,000 qw, n=3), darbepoetin (500 μg q2 w, n=11), and GCSF was added in 20 patients. Results: At inclusion in the program, median age was 69 (range 41–87), including RA (n=3), RAEB-1 (n=2), RARS (n=11), RCMD (n=12), and RCMD-RS (n=3). Karyotype was fav (n=27), int (n=2), and unfav (n=2). IPSS was low (n=15), int-1 (n=16). Median ESAs treatment duration was 3 months (3-36+). According to IWG 2006 criteria, 18 pts were primary resistant to ESAs while 13 relapsed after a 12 months median duration of erythroid response (range 3–36). At onset of LEN, median Hb level was 8.9 g/dl (range 6.3–9.9), median endogenous EPO level 172 UI/l (48-1092 UI/l). The starting doses of LEN were 5 (n=10) or 10 mg (n=21), daily (n=26) or daily × 3 wks q28d cycle (n=5). 20 pts also received ESAs including EPO alone (n=6) and EPO+GCSF (n=14). Deep vein thrombosis (DVT) prophylaxis was made in 22 pts (71%) with aspirin (n=20), heparin (n=1) or warfarin (n=1). With a median follow-up of 16 months (range 3–27), 13 (42%) pts obtained an erythroid response (IWG 2006 criteria). All responses occurred within the first 3 months of treatment. 4 of the responders (31%) relapsed at 4, 9, 15, and 16 months whereas 9 (69%) were still responding after 3+ to 24+ months. Median response duration was 12 months. Of the 24 RBC-TD patients, 10 (42 %) achieved RBC-TI of 12 months median duration (range 3+-22+). The most common drug-related grade 3/4 adverse events were neutropenia (n=6, 19%) and thrombocytopenia (n=6, 19%). No pt developed DVT. One pt with RCMD and complex karyotype developed AML and died at 3.1 months from treatment onset, 2 additional pts who resisted to LEN died 5 and 6 months after LEN interruption. According to IWG 2006 criteria, the proportion of erythroid responses was significantly lower in the 8 patients who had developed neutropenia or thrombocytopenia: 1/8 vs 12/23, p = 0.038. Among the 24 RBC-TD patients, the proportion of RBC-TI was significantly lower in the 8 patients who had developed neutropenia or thrombocytopenia: 1/8 vs 9/16, p = 0.05. Median RBC-TI duration was significantly lower in the 8 patients who had developed neutropenia or thrombocytopenia: 0 vs 9 months, p=0.05. Other factors such as age, sex, WHO classification, time between diagnosis and treatment, response to ESAs, interval between ESAs and REV, WBC count, hemoglobin level, platelet count, LEN dose, combination to ESAs, did not significantly influence response to LEN, and RBC-TI duration. Conclusion: In this cohort of lower-risk non-del(5q) MDS refractory to ESAs LEN yielded RBC transfusion independence in more than 40% of the pts and was well-tolerated. Treatment-induced cytopenia was associated with fewer erythroid responses and shorter response duration. Disclosures: No relevant conflicts of interest to declare.

scholarly journals Lenalidomide in lower-risk myelodysplastic syndromes with karyotypes other than deletion 5q and refractory to erythropoiesis-stimulating agents

2011 ◽  
Vol 156 (5) ◽  
pp. 619-625 ◽  
Author(s):  
David Sibon ◽  
Giovanna Cannas ◽  
Fiorenza Baracco ◽  
Thomas Prebet ◽  
Norbert Vey ◽  
...  
Keyword(s):  
Myelodysplastic Syndromes ◽  
Lower Risk ◽  
Erythropoiesis Stimulating Agents

scholarly journals Proposals for revised IWG 2018 hematological response criteria in patients with MDS included in clinical trials

Blood ◽  
2019 ◽  
Vol 133 (10) ◽  
pp. 1020-1030 ◽  
Author(s):  
U. Platzbecker ◽  
P. Fenaux ◽  
L. Adès ◽  
A. Giagounidis ◽  
V. Santini ◽  
...  
Keyword(s):  
Clinical Trials ◽  
Myelodysplastic Syndromes ◽  
Working Group ◽  
Lower Risk ◽  
Response Assessment ◽  
Response To Treatment ◽  
Response Criteria ◽  
Patient Response ◽  
Erythroid Response ◽  
Clinical Responses

Abstract The heterogeneity of myelodysplastic syndromes (MDSs) has made evaluating patient response to treatment challenging. In 2006, the International Working Group (IWG) proposed a revision to previously published standardized response criteria (IWG 2000) for uniformly evaluating clinical responses in MDSs. These IWG 2006 criteria have been used prospectively in many clinical trials in MDSs, but proved challenging in several of them, especially for the evaluation of erythroid response. In this report, we provide rationale for modifications (IWG 2018) of these recommendations, mainly for “hematological improvement” criteria used for lower-risk MDSs, based on recent practical and reported experience in clinical trials. Most suggestions relate to erythroid response assessment, which are refined in an overall more stringent manner. Two major proposed changes are the differentiation between “procedures” and “criteria” for hematologic improvement–erythroid assessment and a new categorization of transfusion-burden subgroups.

Treatment of Myelodysplastic Syndromes with del 5q before the Lenalidomide Era: The GFM Experience.

Blood ◽  
2006 ◽  
Vol 108 (11) ◽  
pp. 2678-2678 ◽  
Author(s):  
Charikleia Kelaidi ◽  
Sophie Park ◽  
Sabine Brechignac ◽  
Lionel Mannone ◽  
Norbert Vey ◽  
...  
Keyword(s):  
Myelodysplastic Syndromes ◽  
Response Rate ◽  
Response Duration ◽  
Response Rates ◽  
Erythroid Response ◽  
Recent Introduction ◽  
Pre Treatment

Abstract Background: MDS with del 5q are characterized by profound anemia, which until the recent introduction of lenalidomide (N Engl J Med2005; 352: 549–57, J Clin Oncol2005;16S:5), was considered generally unresponsive to available treatments. In order to reevaluate the outcome of those patients in the pre-lenalidomide era, we analyzed response of anemia in MDS with del 5q treated with EPO ± G-CSF and thalidomide in previous GFM trials. Patients: MDS with del 5q included in 419 MDS treated with EPO or Darbepoetin (DAR) ± G-CSF by GFM centers (including 3 successive GFM trials: Blood2004; 104: 321–7; Blood2005;106 suppl 1: 712a; Br J Haematol2006;133: 513–9 and submitted to ASH 2006), and in 134 MDS treated with thalidomide in two successive GFM trials (Br J Haematol2005; 131: 609–18, and submitted to ASH 2006). Patients received at least 30,000 U/w of EPO or 300 mg/w of DAR and doses ranging from 50 to 800 mg/d of Thalidomide during at least 12 weeks. Results: 48 MDS with del 5q received EPO (or DAR) ± G-CSF, including 30 pts with del 5q alone, 9 with one and 9 with >1 additional cytogenetic abn; 21/48 had marrow blasts ≥5% (7 had >10%). 17 had the “5q- syndrome” according to WHO. Median pre-treatment EPO level was 287 UI/L (range 12–5,665), i.e. significantly more than in non del 5q cases (median 68, p<0.001). 22/48 pts (46%) had erythroid response, including 15 major and 7 minor (11 responses after EPO or DAR alone and 11 after EPO or DAR + G-CSF) vs. 64% in pts without del 5q (p=0.01) (p= 0.066 after adjustment for marrow blasts). The response rate was 52%, 55%, 22% and 33%, respectively in del 5q pts with the 5q- syndrome, one additional cytogenetic abn, >1 additional cytogenetic abn, and marrow blasts ≥5%. Response duration was significantly shorter in MDS with del 5q than in other MDS (mean 12 vs. 24 months, p=0.019) and in pts with 5q- syndrome vs. other MDS with marrow blasts <5% (mean 11vs. 24months, p=0.025). 20 pts with del 5q were treated with thalidomide. 6/20 had an erythroid response (30 %, including 3 major and 3 minor responses) vs. 29% of other MDS (p=NS) Conclusion: MDS with del 5q with ≤1 additional cytogenetic abn and no excess of marrow blasts may have erythroid response to EPO ± G-CSF but responses are generally very short, while response rates to thalidomide are low. Those results are clearly inferior to results obtained with lenalidomide in MDS with del 5q.

Lenalidomide-Induced Cytopenias: Relationship to Hematologic Improvement in Patients with Myelodysplastic Syndromes (MDS).

Blood ◽  
2007 ◽  
Vol 110 (11) ◽  
pp. 821-821 ◽  
Author(s):  
Mikkael A. Sekeres ◽  
Jaroslaw P. Maciejewski ◽  
Aristoteles Giagounidis ◽  
Kenton Wride ◽  
Robert D. Knight ◽  
...  
Keyword(s):  
Absolute Neutrophil Count ◽  
Neutrophil Count ◽  
Myelodysplastic Syndromes ◽  
Odds Ratio ◽  
Lower Risk ◽  
Multivariate Analyses ◽  
Mechanisms Of Action ◽  
Erythroid Response ◽  
Transfusion Independence ◽  
Rbc Transfusion

Abstract Background: Lenalidomide (LEN) is effective in MDS patients (pts) with or without deletion (del) 5q cytogenetic abnormalities. Common toxicities include neutropenia and thrombocytopenia. Both occurrence of cytopenias and response to LEN is more common in pts with the del 5q abnormality. This study analyzes whether development of treatment-related cytopenias is associated with response to LEN in lower-risk MDS pts. Methods: Transfusion-dependent, low/int-1-risk MDS pts were enrolled in the MDS-003 (del 5q pts) and MDS-002 (non-del 5q pts) studies. Pts were treated with 10 mg LEN (daily or 21/28 days). Baseline thrombocytopenia was defined as a platelet (plt) count <150,000/mm3; neutropenia as an absolute neutrophil count (ANC) <2000/mm3 (grade 1–4 using the CTC v2.0). Cytopenias were assessed within the first 8 weeks of LEN therapy, and given functional definitions based on frequency tables. Response was assessed using International Working Group criteria. Results: Of 147 evaluable pts in MDS-003, 59 (40%) had thrombocytopenia, 59 (40%) neutropenia, and 84 (57%) neutropenia and/or thrombocytopenia according to baseline labs. Of 210 evaluable pts in MDS-002, 69 (33%) had thrombocytopenia and 81 (39%) neutropenia at baseline. For both studies, median age was 71 and 72 years and MDS duration was 2.5 and 2.2 years, respectively. RBC transfusion independence (TI) was achieved by 99 pts (67%) in MDS-003 (List et al. NEJM 2006) and 56 pts (26%) in MDS-002. For pts with del 5q, development of thrombocytopenia correlated with TI, regardless of baseline plt count (p=0.005). Comparing pts who had a ≥50% drop vs those who did not, TI was achieved in 76% vs 47% of pts without baseline thrombocytopenia and in 67% vs 38% of pts with thrombocytopenia, respectively. Similar results held for pts without baseline neutropenia: 82% whose ANC fell ≥75% achieved TI, compared to 56% whose ANC fell <75% (p=0.018). In pts with baseline neutropenia, ANC drop did not correlate with TI (p=0.75). In pts with any baseline cytopenia, those whose ANCs fell by ≥75% and/or plt by ≥50% were more likely to achieve TI than those whose counts did not drop substantially, controlling for baseline cytopenias (71% vs. 60%, p=0.024). In multivariate analyses, both a treatment-related ANC drop ≥75% (odds ratio [OR]=2.68, p=0.04) and a plt drop ≥50% (OR=2.79, p=0.05) remained associated with TI in MDS-003. Neither was associated with duration of TI response, though there was a trend with drop in ANC (hazard ratio=2.04, p=0.06). In contrast, for pts without del 5q (MDS-002), no correlation exists between TI and drop in plt count (p=0.36 for patients without and p=0.16 for those with baseline thrombocytopenia), drop in ANC (p=0.43 for those without and p=0.44 for those with baseline neutropenia), or development of either cytopenia. No correlation with TI could be established in MDS-002 for drops of 25%, 50%, or 75% within 4, 8, or 16 weeks of therapy, in both univariate and multivariate analyses. Conclusions: In MDS pts with del 5q, treatment-related thrombocytopenia, and neutropenia in those with normal baseline ANCs, correlate with response to LEN, supporting the link between suppression of the del 5q clone and erythroid response. This correlation was not observed in non-del 5q MDS pts, indicating alternate mechanisms of action of LEN.

Lenalidomide Treatment For Lower Risk Non-Deletion 5q Myelodysplastic Syndromes Patients Yields Higher Response Rates When Used Prior To Azanucleosides

Blood ◽  
2013 ◽  
Vol 122 (21) ◽  
pp. 1507-1507
Author(s):  
Rami S Komrokji ◽  
Maria G. Corrales-Yepez ◽  
Najla H Al Ali ◽  
Eric Padron ◽  
Jeffrey E Lancet ◽  
...  
Keyword(s):  
Overall Survival ◽  
Myelodysplastic Syndromes ◽  
Lower Risk ◽  
Research Funding ◽  
Response Rates ◽  
Second Line ◽  
First Line ◽  
Second Line Therapy ◽  
First Line Therapy ◽  
Line Therapy

Abstract Introduction Lenalidomide (LEN) is the standard of care for treatment of transfusion dependent lower risk myelodysplastic syndromes (MDS) with chromosome 5q deletion (del 5q). In the MDS-002 study, 26% of lower risk transfusion dependent MDS patients became red blood cell transfusion independent after LEN treatment. National Comprehensive Cancer Network (NCCN) clinical guidelines list LEN as a second line treatment alternative for transfusion dependent anemia in lower risk non-del 5q MDS after azanucleosides failure. The response rate to LEN after azanucleosides failure, however, is not known given that the MDS-002 study preceded FDA approval of azanucleosides. To address the best sequence of LEN to optimize response potential in lower risk MDS, we examined the response rates to LEN in non-del 5q lower risk MDS when offered as first line after (erythroid stimulating agents) ESA's or after azacitidine failure. Methods This was a retrospective study conducted using the Moffitt Cancer Center (MCC) MDS database. We identified patients with lower risk MDS who received both LEN and azacitidine as first or second line therapy after erythroid stimulating agents. Lower risk MDS was defined according to the international prognostic scoring system (IPSS) Low or intermediate-1 (int-1) risk groups. The primary endpoint was to compare rates of erythroid hematological improvement (HI-E) between the group of patients who received LEN as first line therapy followed by azacitidine as second line (LEN 1st line group) and those who received LEN as second line therapy after azacitidine (LEN 2nd line group). HI was defined according to international working group criteria (IWG 2006). Chi- square test was used for categorical variables, T-test was used for continuous variables, and Kaplan Meier estimates for overall survival. All analyses were conducted using SPSS statistical software (IBM version 21) Results We identified 63 patients who received both azacitidine and LEN as first and second line where 37 patients were in group 1 (LEN 1st line) and 26 patients were in group 2 (LEN 2nd line). Baseline characteristics between the two groups are summarized in Table-1. There were no statistically significant differences between the 2 groups in terms of mean age at diagnosis, gender, WHO subtype, revised IPSS, or mean blood counts. The majority of patients had refractory cytopenia with multilineage dysplasia (RCMD) and had low risk revised IPSS . The rate of HI-E was 38% (n=14) among LEN 1st line group compared to 12% (n=3) in LEN 2nd line group. (p=0.04). There was no difference in overall survival (OS) among the two groups with a median OS of 104 months and 87 months, respectively, p=0.55. There was no difference in AML transformation rate, 5.4% (n=2) and 11% (n=3) among the two groups, respectively, p=0.33. There were no differences in response rates to azacitidine among the two groups. Among the Len 1st line group response to 2nd line azacitidine was 38% (n=14) compared to 35% (n=9) among those who received azacitidine as first line followed by LEN as 2nd line. (p=0.69). Conclusion LEN yields a higher rate of HI-E in non-del 5q lower risk MDS when used as first line therapy. If validated in a larger cohort, LEN should be considered for 1st line therapy after ESAs rather than after azacitidine failure. Responses to azacitidine were similar among the two groups, indicating no adverse effect of LEN on azacitidine response. Disclosures: Komrokji: Celgene: Research Funding, Speakers Bureau. Off Label Use: use of lenalidomide in non del 5q. Lancet:Celgene: Research Funding. List:Celgene: Research Funding.

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