scholarly journals Subclonal NT5C2 mutations are associated with poor outcomes after relapse of pediatric acute lymphoblastic leukemia

Blood ◽  
2020 ◽  
Vol 135 (12) ◽  
pp. 921-933 ◽  
Author(s):  
Malwine J. Barz ◽  
Jana Hof ◽  
Stefanie Groeneveld-Krentz ◽  
Jui Wan Loh ◽  
Annabell Szymansky ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
B Cell ◽  
Lymphoblastic Leukemia ◽  
Multivariable Analysis ◽  
Induction Treatment ◽  
Clinical Effects ◽  
Event Free Survival ◽  
Cell Precursor ◽  
Free Survival ◽  
Poor Outcomes

Abstract Activating mutations in cytosolic 5′-nucleotidase II (NT5C2) are considered to drive relapse formation in acute lymphoblastic leukemia (ALL) by conferring purine analog resistance. To examine the clinical effects of NT5C2 mutations in relapsed ALL, we analyzed NT5C2 in 455 relapsed B-cell precursor ALL patients treated within the ALL-REZ BFM 2002 relapse trial using sequencing and sensitive allele-specific real-time polymerase chain reaction. We detected 110 NT5C2 mutations in 75 (16.5%) of 455 B-cell precursor ALL relapses. Two-thirds of relapses harbored subclonal mutations and only one-third harbored clonal mutations. Event-free survival after relapse was inferior in patients with relapses with clonal and subclonal NT5C2 mutations compared with those without (19% and 25% vs 53%, P < .001). However, subclonal, but not clonal, NT5C2 mutations were associated with reduced event-free survival in multivariable analysis (hazard ratio, 1.89; 95% confidence interval, 1.28-2.69; P = .001) and with an increased rate of nonresponse to relapse treatment (subclonal 32%, clonal 12%, wild type 9%, P < .001). Nevertheless, 27 (82%) of 33 subclonal NT5C2 mutations became undetectable at the time of nonresponse or second relapse, and in 10 (71%) of 14 patients subclonal NT5C2 mutations were undetectable already after relapse induction treatment. These results show that subclonal NT5C2 mutations define relapses associated with high risk of treatment failure in patients and at the same time emphasize that their role in outcome is complex and goes beyond mutant NT5C2 acting as a targetable driver during relapse progression. Sensitive, prospective identification of NT5C2 mutations is warranted to improve the understanding and treatment of this aggressive ALL relapse subtype.

scholarly journals Impact of Blinatumomab Treatment on Bone Marrow Function in Patients with Relapsed/Refractory B-Cell Precursor Acute Lymphoblastic Leukemia

Cancers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 5607
Author(s):  
Hagop M. Kantarjian ◽  
Gerhard Zugmaier ◽  
Monika Brüggemann ◽  
Brent L. Wood ◽  
Heinz A. Horst ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
B Cell ◽  
Survival Benefit ◽  
Lymphoblastic Leukemia ◽  
Philadelphia Chromosome ◽  
Event Free Survival ◽  
Cell Precursor ◽  
Survival Prognosis ◽  
Free Survival ◽  
Bone Marrow Function

Association of blinatumomab treatment with myelosuppression was examined in this study. Peripheral blood counts were assessed prior to, during, and after blinatumomab treatment in patients with relapsed/refractory Philadelphia chromosome-negative (Ph−) B-cell precursor (BCP) acute lymphoblastic leukemia (ALL; n = 267) and Ph+ BCP-ALL (n = 45) from the TOWER and ALCANTARA studies, respectively, or chemotherapy in patients with Ph− BCP-ALL (n = 109) from the TOWER study; all the patients with relapsed/refractory BCP-ALL and responders achieving complete remission (CR) or CR with partial/incomplete hematological recovery (CRh/CRi) were evaluated. Event-free survival (EFS) and overall survival (OS) were assessed in patients achieving CR and CRh/CRi. Median leukocyte, neutrophil, and platelet counts increased during two blinatumomab cycles but remained low longer after chemotherapy. Among the responders, there was a trend that a greater proportion of patients achieved CR with blinatumomab (Ph−, 76.5%; Ph+, 77.8%) versus with chemotherapy (Ph−, 63.6%). In the TOWER study, the survival prognosis for patients achieving CRh/CRi versus CR with blinatumomab was more similar (median OS, 11.9 (95% CI, 3.9–not estimable (NE)) vs. 15.0 (95% CI, 10.4–NE) months, p = 0.062) than with chemotherapy (5.2 (95% CI, 1.6–NE) vs. 18.9 (95% CI, 9.3–NE) months, p = 0.013). Blinatumomab treatment, with only temporary and transient myelosuppression, resulted in a greater survival benefit than chemotherapy.

scholarly journals Prognostic significance of CD20 expression in childhood B-cell precursor acute lymphoblastic leukemia

Blood ◽  
2006 ◽  
Vol 108 (10) ◽  
pp. 3302-3304 ◽  
Author(s):  
Sima Jeha ◽  
Frederick Behm ◽  
Deqing Pei ◽  
John T. Sandlund ◽  
Raul C. Ribeiro ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
B Cell ◽  
Lymphoblastic Leukemia ◽  
Prognostic Significance ◽  
Prognostic Impact ◽  
Event Free Survival ◽  
Cell Precursor ◽  
Free Survival ◽  
Cd20 Expression ◽  
Therapy Studies

Abstract CD20 expression is associated with inferior survival in adults with acute lymphoblastic leukemia (ALL). We analyzed the prognostic impact of CD20 expression in 353 children with B-cell precursor ALL treated in 3 consecutive St Jude Total Therapy studies. CD20 expression (> 20%) was found in 169 patients (48%) and was more frequent in patients between 1 and 10 years of age than in those younger than 1 or older than 10 years (P = .001). None of 14 patients with MLL-AF4 expressed CD20. There was no association between CD20 expression and E2A-PBX, TEL-AML1, ploidy, white blood cell count at diagnosis, or sex. In contrast to the experience in adult ALL, our patients with CD20 expression tended to have a better treatment outcome than those without the expression: 5-year event-free survival 84% ± 2.9% versus 78% ± 3.1% (P = .08). These data suggest that CD20 expression is not associated with inferior outcome in pediatric patients treated with contemporary regimens.

Dexamethasone and Individualized Asparaginase Dosing Are Each Associated with Superior Event-Free Survival in Childhood Acute Lymphoblastic Leukemia: Results From DFCI-ALL Consortium Protocol 00-01.

Blood ◽  
2009 ◽  
Vol 114 (22) ◽  
pp. 321-321 ◽  
Author(s):  
Lynda M. Vrooman ◽  
Donna S. Neuberg ◽  
Kristen E. Stevenson ◽  
Jeffrey G. Supko ◽  
Stephen E. Sallan ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
Research Funding ◽  
Lymphoblastic Leukemia ◽  
Multivariable Analysis ◽  
Hazard Ratio ◽  
Induction Treatment ◽  
Newly Diagnosed ◽  
Event Free Survival ◽  
Free Survival ◽  
To Receive

Abstract Abstract 321 BACKGROUND: The DFCI-ALL Consortium Protocol 00-01 aimed to determine the relative efficacy and toxicity of 1) dexamethasone (DEX) vs. prednisone (PRED) and 2) asparaginase (ASP) with individualized dosing (ID) based on pharmacokinetic measurements vs. standard fixed dosing (FD) based on body surface area, in the treatment of children with newly diagnosed acute lymphoblastic leukemia (ALL). PATIENTS and METHODS: Between 2000 and 2004, 492 eligible patients (pts) ages 1-18 years (yrs) with newly diagnosed ALL enrolled on Protocol 00-01 from 10 institutions. 282 pts were standard risk (SR) and 210 high risk (HR). Post-induction treatment for all patients included 30 weeks of intramuscular E. coli ASP (beginning at week 7) and vincristine/corticosteroid pulses every 3 weeks for 24 months. Pts who achieved complete remission (CR) were eligible for two randomized comparisons: 1) Steroids: Pts were randomized to receive either DEX or PRED given as 5-day pulses every 3-weeks, and 2) ASP: Pts were randomized to receive either FD (25,000IU/m2) or ID (starting dose 12,500 IU/m2) for 30 weeks. Nadir serum ASP activity (NSAA) was assessed every 3 weeks, and ASP doses on the ID arm were adjusted to maintain NSAA between 0.10-0.14 IU/mL. NSAA was assayed centrally by a validated biochemical assay. RESULTS: 473 pts (96%) achieved CR. With a median follow-up of 4.9 years, the 5-year event-free survival (EFS) ± standard error for all 492 pts was 80 ± 2% and overall survival (OS) was 91 ± 1%. Steroid randomization: 408/473 pts (86%) participated in the steroid randomization (DEX: 201, PRED: 207). Pts randomized to DEX had 5-yr EFS of 90 ± 2% compared with 81 ± 3% for PRED (p=0.01) [Table I]. For pts 10-18 yrs of age, there was a significant increase in the rate of osteonecrosis (ON) with DEX, with 5-yr cumulative incidence (CI) of 23% compared with 4.7% for PRED (p=0.02). There was no difference in the 5-yr CI of ON based on steroid type in pts 1-10 yrs of age (DEX: 2.6% vs. PRED: 4.3%, p=0.43). Fractures were also more common in pts 10-18 yrs of age randomized to DEX (p=0.06), but not in younger pts (p=0.25). Infection (positive blood culture or radiographic evidence of invasive fungal disease) developed in 38 pts (18.8%) randomized to DEX compared with 22 pts (10.6%) randomized to PRED (p=0.03). There was no difference in remission death rate based on steroid randomization (DEX 0% vs. PRED 2%, p=0.5). ASP randomization: 384/473 pts (81%) participated in the ASP randomization (FD: 195, ID: 189). Pts randomized to ID had superior EFS with 5-yr EFS of 90 ± 2% compared with 82 ± 3% for FD (p=0.04) [Table I]. There was no difference between the two arms in the frequency of ASP-related allergy (p=0.46), pancreatitis (p=0.66) or thrombosis (p=0.77). There was also no difference by treatment arm in the proportion of pts able to complete at least 25 weeks of ASP (FD: 88% vs. ID: 87%, p=0.76). There was no difference between the two arms in the proportion of pts with non-detectable NSAA, although fewer pts on the ID arm had high NSAA (>0.14 IU/mL). On multivariable analysis, both DEX and ID ASP were independent predictors of favorable outcome (hazard ratio 0.49 for DEX, p=0.02; hazard ratio 0.52 for ID, p=0.04), with no indication of an interaction. Only 5/92 (5%) pts randomized to both DEX and ID ASP experienced an event. CONCLUSIONS: DEX was associated with superior EFS, but also more bone and infectious toxicities, especially in older children/adolescents. Future studies should focus on minimizing DEX toxicity in older pediatric pts without compromising efficacy. ID of ASP was feasible and was associated with superior EFS. The improved EFS with ID was not due to a reduction in ASP-related toxicity or improved tolerability, but was associated with a reduction in the proportion of pts with high NSAA. Disclosures: Supko: Enzon Inc.: Research Funding. Sallan:Enzon Inc.: Research Funding; Enzon Inc.: Contributed to support of an investigator meeting.

scholarly journals IKZF1plus Defines a New Minimal Residual Disease–Dependent Very-Poor Prognostic Profile in Pediatric B-Cell Precursor Acute Lymphoblastic Leukemia

2018 ◽  
Vol 36 (12) ◽  
pp. 1240-1249 ◽  
Author(s):  
Martin Stanulla ◽  
Elif Dagdan ◽  
Marketa Zaliova ◽  
Anja Möricke ◽  
Chiara Palmi ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
B Cell ◽  
Minimal Residual Disease ◽  
Residual Disease ◽  
Lymphoblastic Leukemia ◽  
Event Free Survival ◽  
Cell Precursor ◽  
Free Survival ◽  
Prognostic Profile ◽  
Minimal Residual

Purpose Somatic deletions that affect the lymphoid transcription factor–coding gene IKZF1 have previously been reported as independently associated with a poor prognosis in pediatric B-cell precursor (BCP) acute lymphoblastic leukemia (ALL). We have now refined the prognostic strength of IKZF1 deletions by analyzing the effect of co-occurring deletions. Patients and Methods The analysis involved 991 patients with BCP ALL treated in the Associazione Italiana Ematologia ed Oncologia Pediatrica–Berlin-Frankfurt-Muenster (AIEOP-BFM) ALL 2000 trial with complete information for copy number alterations of IKZF1, PAX5, ETV6, RB1, BTG1, EBF1, CDKN2A, CDKN2B, Xp22.33/Yp11.31 (PAR1 region; CRLF2, CSF2RA, and IL3RA), and ERG; replication of findings involved 417 patients from the same trial. Results IKZF1 deletions that co-occurred with deletions in CDKN2A, CDKN2B, PAX5, or PAR1 in the absence of ERG deletion conferred the worst outcome and, consequently, were grouped as IKZF1plus. The IKZF1plus group comprised 6% of patients with BCP ALL, with a 5-year event-free survival of 53 ± 6% compared with 79 ± 5% in patients with IKZF1 deletion who did not fulfill the IKZF1plus definition and 87 ± 1% in patients who lacked an IKZF1 deletion ( P ≤ .001). Respective 5-year cumulative relapse incidence rates were 44 ± 6%, 11 ± 4%, and 10 ± 1% ( P ≤ .001). Results were confirmed in the replication cohort, and multivariable analyses demonstrated independence of IKZF1plus. The IKZF1plus prognostic effect differed dramatically in analyses stratified by minimal residual disease (MRD) levels after induction treatment: 5-year event-free survival for MRD standard-risk IKZF1plus patients was 94 ± 5% versus 40 ± 10% in MRD intermediate- and 30 ± 14% in high-risk IKZF1plus patients ( P ≤ .001). Corresponding 5-year cumulative incidence of relapse rates were 6 ± 6%, 60 ± 10%, and 60 ± 17% ( P ≤ .001). Conclusion IKZF1plus describes a new MRD-dependent very-poor prognostic profile in BCP ALL. Because current AIEOP-BFM treatment is largely ineffective for MRD-positive IKZF1plus patients, new experimental treatment approaches will be evaluated in our upcoming trial AIEOP-BFM ALL 2017.

scholarly journals Effect of Blinatumomab vs Chemotherapy on Event-Free Survival Among Children With High-risk First-Relapse B-Cell Acute Lymphoblastic Leukemia

JAMA ◽  
2021 ◽  
Vol 325 (9) ◽  
pp. 843
Author(s):  
Franco Locatelli ◽  
Gerhard Zugmaier ◽  
Carmelo Rizzari ◽  
Joan D. Morris ◽  
Bernd Gruhn ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
High Risk ◽  
B Cell ◽  
Lymphoblastic Leukemia ◽  
Event Free Survival ◽  
Free Survival ◽  
Cell Acute Lymphoblastic Leukemia ◽  
First Relapse

scholarly journals CD20 up-regulation in pediatric B-cell precursor acute lymphoblastic leukemia during induction treatment: setting the stage for anti-CD20 directed immunotherapy

Blood ◽  
2008 ◽  
Vol 112 (10) ◽  
pp. 3982-3988 ◽  
Author(s):  
Michael N. Dworzak ◽  
Angela Schumich ◽  
Dieter Printz ◽  
Ulrike Pötschger ◽  
Zvenyslava Husak ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
B Cell ◽  
Residual Disease ◽  
Lymphoblastic Leukemia ◽  
Leukemic Cells ◽  
Induction Treatment ◽  
Cell Precursor ◽  
Anti Cd20 ◽  
The Impact

Abstract CD20 is expressed in approximately one- half of pediatric acute lymphoblastic leukemia (ALL) cases with B-cell precursor (BCP) origin. We observed that it is occasionally up-regulated during treatment. To understand the impact of this on the potential effectiveness of anti-CD20 immunotherapy, we studied 237 CD10+ pediatric BCP-ALL patients with Berlin-Frankfurt-Munster (BFM)–type therapy. We analyzed CD20 expression changes from diagnosis to end-induction, focusing on sample pairs with more than or equal to 0.1% residual leukemic blasts, and assessed complement-induced cytotoxicity by CD20-targeting with rituximab in vitro. CD20-positivity significantly increased from 45% in initial samples to 81% at end-induction (day 15, 71%). The levels of expression also increased; 52% of cases at end-induction had at least 90% CD20pos leukemic cells, as opposed to 5% at diagnosis (day 15, 20%). CD20 up-regulation was frequent in high-risk patients, patients with high minimal residual disease at end-induction, and patients who suffered later from relapse, but not in TEL/AML1 cases. Notably, up-regulation occurred in viable cells sustaining chemotherapy. In vitro, CD20 up-regulation significantly enhanced rituximab cytotoxicity and could be elicited on prednisolone incubation. In conclusion, CD20 up-regulation is frequently induced in BCP-ALL during induction, and this translates into an acquired state of higher sensitivity to rituximab. This study was registered at http://www.clinicaltrials.gov as #NCT00430118.

CD20 up-Regulation in Childhood B-Cell Precursor Acute Lymphoblastic Leukemia during Induction Treatment Translates into Higher Rituximab-Sensitivity.

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 906-906
Author(s):  
Andishe Attarbaschi ◽  
Angela Schumich ◽  
Georg Mann ◽  
Oskar A. Haas ◽  
Helmut Gadner ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
B Cell ◽  
Induction Therapy ◽  
Residual Disease ◽  
Lymphoblastic Leukemia ◽  
Leukemic Cells ◽  
Remission Induction ◽  
Induction Treatment ◽  
Cell Precursor ◽  
The Impact

Abstract CD20 is expressed in about one half of childhood acute lymphoblastic leukemia (ALL) cases with B-cell precursor (BCP) origin. We recently observed that this phenotypic marker is further up-regulated in some patients during remission induction treatment containing corticosteroids for up to 5 weeks. To understand the impact of this phenomenon on the potential effectiveness of anti-CD20 immunotherapy (i.e., Rituximab), we studied 237 CD10-positive childhood BCP-ALL patients consecutively enrolled onto the trial AIEOP-BFM-ALL 2000. The analysis included the assessment of CD20 expression changes from diagnosis to the end of induction therapy and complement-induced cytotoxicity by CD20-targeting with Rituximab in-vitro. CD20-positivity significantly increased from diagnosis to the end of induction therapy with respect to the number of positive cases as well as to the levels of expression. After completion of induction therapy, one half of cases showed ≥ 90% CD20pos. leukemic cells, as opposed to 5% at diagnosis and 20% after 2 weeks of chemotherapy. Notably, up-regulation occurred in viable cells sustaining chemotherapy, most probably as a consequence of steroid-induced modulation of gene expression. Rituximab-cytotoxicity was significantly enhanced by CD20 up-regulation and depended on high expression levels. Importantly, CD20 up-regulation was frequent in high-risk patients (mainly poor prednisone responders), patients with high minimal residual disease levels at the end of induction therapy, and patients who suffered later from relapse, but not in TEL/AML1-positive cases. In conclusion, CD20 up-regulation is frequently induced in BCP-ALL during induction therapy and this translates into an acquired state of higher sensitivity to Rituximab.

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