A prospective, open-label, randomised, parallel design study of 4 generic formulations of intramuscular L-asparaginase in childhood precursor B-cell acute lymphoblastic leukaemia (ALL).

AIMS: L-asparaginase is an essential medicine for childhood ALL. The quality of generic L-asparaginase available in India is a matter of concern. We compared four commonly used generic formulations of L-asparaginase in India. MATERIALS AND METHODS: We conducted a prospective, open-label, randomised trial of four generic formulations of asparaginase for the treatment of patients with newly diagnosed intermediate-risk B-ALL. Patients were randomly assigned in a 1:1:1:1 ratio to receive generic asparaginase at a dose of at 10,000 IU/m 2 on days 9, 12, 15, and 18 of a 35-day cycle (Induction treatment). The primary end points were to determine the difference in the asparaginase activity and asparagine depletion. Historical patients who received L-asparaginase Medac (innovator) served as controls. RESULTS: A total of 48 patients underwent randomization; 12 patients each in the four arms. Failure to achieve predefined activity threshold of 100 IU/L was observed in 9/40 samples of Generic A (22·5%), 23/40 of Generic B (57·5%), and 43/44 (98%) each of Generic C and D. All 27 samples from seven historical patients who were administered Medac had activity > 100 IU/L. The average activity was significantly higher for Genericm A, 154 (70·3, 285·4) IU/L followed by Generic B 84·5(44·2, 289·1) IU/L, Generic C 45(14·4, 58·4) IU/L, and Generic D 20·4(13, 35) IU/L. Only 6 patients had asparaginase activity > 100 IU/L on each of the four occasions (Generic A = 5; Generic B = 1), and none of them developed Anti-Asparaginase Antibodies (AAA). On the other hand, AAA was observed in 12/36 patients who had at least one level < 100 IU/L (P < 0·05): Generic A 3/5, Generic B = 3/9, Generic D (4/11), and Generic C (5/11). CONCLUSION: Generic A and B had better trough asparaginase activity compared to Generic D and C. Overall, generic formulations had lower asparaginase activity which raises serious clinical concerns regarding their quality. Until strict regulatory enforcement improves the quality of these generics, dose adaptive approaches coupled with therapeutic drug monitoring need to be considered.

Cost-Utility Analysis of Pegaspargase for the Treatment of Acute Lymphoblastic Leukemia in Greece.

BACKGROUND AND OBJECTIVE: Acute lymphoblastic leukemia (ALL) is an acute, rapidly progressing and life-threatening form of cancer involving immature lymphocytes called lymphoblasts. ALL is the most common subtype of leukemia in children and adolescents. The aim of the present study was to assess the cost-utility of pegaspargase versus L-asparaginase, both followed by Erwinase in the therapy sequence, as a treatment option for pediatric, adolescent, and adult patients with ALL in Greece. METHODS: A published cost-utility model comprising a decision tree and a state-transition Markov model was adapted from a public payer perspective to compare a pegaspargase treatment sequence with an L-asparaginase sequence. Efficacy and safety data, as well as utility values, were extracted from the published literature. Direct costs pertaining to drug acquisition, administration, and management of hypersensitivity were considered in the analysis (€2020). Model-extrapolated outcomes included quality-adjusted life-years (QALYs), costs, and incremental cost-effectiveness ratios (ICER). All future outcomes were discounted at 3.5% per annum. Sensitivity analyses were used to explore the impact of changing input data. RESULTS: The analysis showed that the pegaspargase sequence was estimated to produce 0.05 additional QALYs (18.12 vs. 18.07) and lower cost of - €1698 compared with L-asparaginase, indicating that the pegaspargase sequence was a dominant treatment strategy (improved outcomes with reduced costs) compared with L-asparaginase. Deterministic sensitivity analysis confirmed the cost-effective profile of pegaspargase. At the defined willingness-to-pay threshold of €54,000/QALY gained, probabilistic sensitivity analysis showed that pegaspargase had a 100% probability of being cost effective relative to the L-asparaginase sequence. CONCLUSION: The pegaspargase sequence was found to be less costly and more effective (in terms of QALYs) in relation to the L-asparaginase sequence, representing a dominant strategic option for Greek public payers in ALL.

Eficacia y seguridad de asparaginasa pegilada en el tratamiento de pacientes con leucemia linfoblástica aguda y linfoma linfoblástico con hipersensibilidad a L-asparaginasa nativa / Efficacy and safety of pegylated asparaginase in the treatment of patients with acute lymphoblastic leukemia and lymphoblastic lymphoma with hypersensitivity to native L-asparaginase

ANTECECENTES: Como parte de las funciones de la UFETS, se ha elaborado el presente informe sobre el uso de L-asparaginasa pegilada en el tratamiento de pacientes con leucemia linfoblástica aguda (LLA) y linfoma linfoblástico (LL) que presentan hipersensibilidad a L-asparaginasa nativa. En el Instituto Nacional de Enfermedades Neoplásicas se registran más de 500 casos de linfoma no Hodgkin (LNH) y 90 casos de LL anualmente. La población esperada en el INEN para ambas patologías que requieren asparaginasa pegilada es de 12 pacientes al año. El uso de algún tipo de asparaginasa se encuentra dentro del esquema de inducción ECOG. TECNOLOGÍA: En el presente documento se reporta la evaluación del uso de asparaginasa pegilada en pacientes que presentan hipersensibilidad a asparaginasa nativa. En el INEN se estima una población objetivo de 12 pacientes al año. METODOLOGÍA; Se hizo una búsqueda sistemática de la literatura hasta marzo del 2022, en la cual se encontró un ECA que respondía la pregunta PICO. En este estudio realizado en 76 pacientes con LLA, se observó una menor tasa de respuesta al tratamiento en aquellos con hipersensibilidad a L-asparaginasa nativa que recibieron L-asparaginasa pegilada (38%), en comparación con aquellos sin hipersensibilidad que recibieron L-Asparaginasa pegilada (41%) o Lasparaginasa nativa (47%). Además, los pacientes con hipersensibilidad que recibieron L-asparaginasa pegilada no mostraron mayores niveles de toxicidad que aquellos que recibieron L-asparaginasa nativa. Estos resultados resaltan la potencial utilidad de L-asparaginasa pegilada en el tratamiento antineoplásico de pacientes con hipersensibilidad a L-asparaginasa nativa. Sin embargo, el estudio mostró una baja calidad de evidencia. DISCUSIÓN: Tomando los criterios para un marco de valor de la Health Technology Assessment International (2018) para la toma de decisiones y formulación de la recomendación, se describe: a calidad de la evidencia encontrada es baja. En el ECA se halló que el uso de asparaginasa pegilada en pacientes que presentaron hipersensibilidad por asparaginasa nativa tuvo resultados similares en respuesta completa que en aquellos pacientes que no presentaron hipersensibilidad y continuaron con asparaginasa nativa o asparaginasa pegilada. La calidad de evidencia fue baja, a pesar de que el estudio para el grupo intervención principal (asparaginasa pegilada en pacientes que presentaron hipersensibilidad a la asparaginasa nativa) no recibió aleatorización basal, este presentó características similares a la comparación. El ensayo clínico presentó sesgos, por enmascaramiento de la intervención y solo se encontró un estudio clínico para responder esta pregunta PICO. No se cuenta con estudios de evaluación económica en la región. Sin embargo, en el Reino Unido se realizó una estimación de costos del uso de asparaginasa pegilada. Aquí se proyectó que su uso puede conllevar a ahorro de costos en relación con el uso de asparaginasa nativa. No obstante, se basa en evidencia local del Reino Unido. Se tiene aceptación por parte de los médicos tratantes para continuar el uso de asparaginasa pegilada en pacientes que presentaron hipersensibilidad a la asparaginasa nativa en leucemia linfoblástica aguda y linfoma linfoblástico. Luego de la discusión, el panel concluye que la asparaginasa pegilada es una opción de apoyo en el tratamiento de inducción en pacientes con LLA o LNH que presentan hipersensibilidad a asparaginasa nativa. CONCLUSIONES: La presente evaluación evaluó el uso de asparaginasa pegilada en pacientes que presentaron hipersensibilidad a asparaginasa nativa. La leucemia linfoblástica aguda y el linfoma linfoblástico son el grupo más frecuente de neoplasias hematológicas malignas en población pediátrica. Dentro del esquema de inducción, se encuentra el uso de algún tipo de asparaginasa. Se realizó una búsqueda sistemática hasta marzo del 2022, encontrando 1 ECA que respondía la pregunta PICO. El ECA encontró que el uso de asparaginasa pegilada en pacientes que presentaron hipersensibilidad por asparaginasa nativa, tuvo resultados similares en respuesta completa de aquellos pacientes que no presentaron hipersensibilidad y continuaron con asparaginasa nativa o asparaginasa pegilada. La calidad de evidencia fue baja. La asparaginasa pegilada se encuentra disponible en el Perú, y el costo de cada ampolla (750 UI/ml) es de S/ 5 500.00. Revisamos un estudio de costo-efectividad realizado en Reino Unido, donde compararon el uso de asparaginasa pegilada versus asparaginasa nativa como primera línea. Se evidenció que el uso de asparaginasa pegilada aumentaba costos del medicamento, pero reducía costos de estancia hospitalaria y de otros gastos sanitarios comparado con asparaginasa nativa, llevando a un ahorro de £ 4741 libras (Colocar conversión en dólares) (para el sistema sanitario de Reino Unido). En pacientes con leucemia linfoblástica aguda y linfoma linfoblástico se sugiere el uso de asparaginasa pegilada en pacientes que presentan hipersensibilidad al uso de asparaginasa nativa.

Unsatisfactory quality of E. coli asparaginase biogenerics in India: Implications for clinical outcomes in acute lymphoblastic leukaemia.

BACKGROUND: The biotherapeutic asparaginase is a cornerstone of therapy in acute lymphoblastic leukaemia (ALL). With limited access to the original native Escherichia coli-derived asparaginase (EcASNase), a variety of EcASNase biogenerics are used in low-middle-income countries (LMICs). The variable quality of these biogenerics potentially influences clinical outcomes. PROCEDURE: Seven biogeneric EcASNases (P1-P7) marketed widely in India were evaluated, with P2 as an exemplar for in vivo monitoring. Therapeutic activity of P2 (10,000 IU/m2 /dose, intramuscular, every 72 hours) was monitored during induction therapy, and drug-related toxicities recorded. Molecular identity, purity and in vitro drug activity of seven biogenerics were characterised using multimodal analyses, and findings compared with reference EcASNase (R). RESULTS: In patients (N = 62) receiving P2, subtherapeutic asparaginase activity (<100 U/L) was observed in 66% (46/70) of trough timepoints (72 hours postdose) during induction. Twelve patients (19%), 11 with high-risk ALL, developed hypersensitivity. Isoforms of EcASNase were identified in all seven biogenerics. All generic products contained impurities with batch-to-batch variability. These included high levels of protein aggregates and host cell protein contamination. In vitro assays of EcASNase activity and leukaemia cell line cytotoxicity were not discriminatory. CONCLUSIONS: Our findings confirm widespread concerns over the unsatisfactory quality and therapeutic activity of native EcASNase biogenerics marketed in LMICs. Appropriate use of these products requires monitored studies to identify clinical suitability and determine appropriate dosing and schedule. For large parts of the world, assured access to high-quality asparaginases remains an unmet therapeutic need.

Premedication prior to PEG-asparaginase is cost-effective in pediatric patients with acute lymphoblastic leukemia.

BACKGROUND: PEG-asparaginase is critical in pediatric acute lymphoblastic leukemia (ALL) therapy but is highly immunogenic. Severe allergic reactions lead to substitution of further PEG-asparaginase with Erwinia. Erwinia is associated with more frequent dosing, increased expense, and limited availability. Premedication may reduce rates of allergic reactions. PROCEDURES: This Markov model evaluated the cost-effectiveness of three strategies: premedication plus therapeutic drug monitoring (TDM), TDM alone, and no premedication or TDM. We modeled two scenarios: a standard-risk (SR) B-ALL patient receiving two asparaginase doses and a high-risk (HR) patient receiving seven asparaginase doses. The model incorporated costs of asparaginase, premedication, TDM and clinic visits, and lost parental wages associated with each additional Erwinia dose. We incorporated a five-year time horizon with a societal perspective. Outcomes were Erwinia substitutions avoided and differences in quality-adjusted life years (QALYs). Probabilistic and one-way sensitivity analyses evaluated model uncertainty. RESULTS: In both scenarios, premedication was the least costly strategy. In SR and HR scenarios, premedication with monitoring resulted in 8% and 7% fewer changes to Erwinia compared with monitoring alone and 3% and 2% fewer changes compared with no premedication/monitoring, respectively. Premedication resulted in the most QALYs gained in the SR patients. Individual variation of model inputs did not change premedication/monitoring favorability for either scenario. In probabilistic sensitivity analyses, premedication/monitoring was favored in >87% of iterations in both scenarios. CONCLUSION: Compared with other strategies, premedication use and asparaginase level monitoring in children with B-ALL is potentially cost-saving.

Implementation of the asparaginase activity assessment technique for clinical use: experience of a Brazilian Center.

Acute lymphoid leukemia is a childhood cancer that in high-income countries has event-free survival rates of 80% and global survival rates of 90%. In Brazil these rates are under 70%. This difference may be due to the implementation of supportive care, including the assessment of asparaginase (ASNase) activity. ASNase may cause hypersensitivity reactions and silent drug inactivation. For this reason, ASNase activity monitoring is an essential tool to ensure an effective treatment. Our aim was to implement an ASNase activity measurement technique at a hospital setting. samples from children who were given Escherichia coli-derived ASNase were collected. The results of the analyses conducted in our laboratory Hospital de Clínicas de Porto Alegre were compared to those of two institutions: Centro Infantil Boldrini and University of Munster. 262 samples were assessed. The results of the first analyses were compared with those obtained at Centro Infantil Boldrini and showed an ICC of 0.954. Thirty samples were sent to the University of Munster and presented an ICC was 0.960. Our results, when compared to those of national and international centers, showed an excellent agreement. The study was able to implement an ASNase activity test to monitor the treatment.

Engineering Cell-Free Protein Synthesis for High-Yield Production and Human Serum Activity Assessment of Asparaginase: Toward On-Demand Treatment of Acute Lymphoblastic Leukemia.

Acute lymphocytic leukemia (ALL) is a common childhood cancer in the United States, with over 6000 new cases diagnosed each year. Administration of bacterial asparaginase (ASNase) has improved survival rates to nearly 80%, however these therapeutics have high incidence of immunological neutralization and serum activity must be monitored for most effective treatment regimens. Here, a 72% improvement in cell-free protein synthesis (CFPS) of FDA approved l-asparaginase (crisantaspase) is demonstrated by employing an aspartate-fed-batch reactor format. A CFPS-based ASNase activity assay as a tool for therapeutic regimentation and production quality control is also presented. This work suggests that shelf-stable and low-cost Escherichia coli-based CFPS reactions may be employed on-demand to 1) synthesize biologics on-site for patient administration, 2) verify biologic activity for dosage calculations, and 3) monitor therapeutic activity in human serum during the treatment regimen. The combination of both therapeutic production and activity assessment introduces a concept of synergistic utility for bacterial cell lysates in modern medical treatment. Indeed, recent work with CFPS biosensors supports a not-too-distant future when shelf-stable E. coli CFPS systems are used to diagnose, treat, and monitor treatment of diseases in the clinical setting.

Randomized assessment of delayed intensification and two methods for parenteral methotrexate delivery in childhood B-ALL: Children's Oncology Group Studies P9904 and P9905.

The delayed intensification (DI) enhanced outcome for patients with acute lymphoblastic leukemia (ALL) treated on BFM 76/79 and CCG 105 after a prednisone-based induction. Childrens Oncology Group protocols P9904/9905 evaluated DI via a post-induction randomization for eligible National Cancer Institute (NCI) standard (SR) and high-risk (HR) patients. A second randomization compared intravenous methotrexate (IV MTX) as a 24- (1 g/m2) vs. 4-h (2 g/m2) infusion. NCI SR patients received a dexamethasone-based three-drug and NCI HR/CNS 3 SR patients a prednisone-based four-drug induction. End induction MRD (minimal residual disease) was obtained but did not impact treatment. DI improved the 10-year continuous complete remission (CCR) rate; 75.5 ± 2.5% vs. 81.8 ± 2.2% p = 0.002, whereas MTX administration did not; 4-h 80.8 ± 1.9%; 24-h 81.4 ± 1.9% (p = 0.7780). Overall survival (OS) at 10 years did not differ with DI: 91.4 ± 1.6% vs. 90.9 ± 1.7% (p = 0.25) without but was higher with the 24-h MTX infusion; 4-h 91.1 ± 1.4%; 24-h 93.9 ± 1.2% (p = 0.0209). MRD predicted outcome; 10-year CCR 87.7 ± 2.2 and 82.1 ± 2.5% when MRD was <0.01% with/without DI (p = 0.007) and 54.3 ± 8% and 44 ± 8% for patients with MRD ≥ 0.01% with/without DI (p = 0.11). DI improved CCR for patients with B-ALL with and without end induction MRD.

A cost-effectiveness analysis of Erwinia asparaginase therapy in children with acute lymphoblastic leukemia.

OBJECTIVES: Erwinia asparaginase is used as a second-line formulation after a neutralizing hypersensitivity reaction to the first-line formulation of asparaginase. Here, we have performed a cost-effectiveness analysis of Erwinia asparaginase treatment. METHODS: Children with acute lymphoblastic leukemia treated according to the Dutch Childhood Oncology ALL-10 or ALL-11 protocol were included and initially treated with PEGasparaginase in the intensification phase. The total treatment costs of this treatment phase, quality of life (QoL), and life years saved (LYS) were studied for two scenarios: (a) patients were switched to Erwinia asparaginase treatment after a hypersensitivity reaction, or (b) asparaginase would have been permanently stopped. RESULTS: Sixty-eight patients were included. There was no difference in QoL between patients with and without a hypersensitivity reaction. The mean costs of the intensification phase per patient were $40,925 if PEGasparaginase could be continued, $175,632 if patients had to switch to Erwinia asparaginase, and $21,190 if asparaginase would have been permanently stopped. An extrapolation of the literature suggests that the 5-year event-free survival would be 10.3% lower without intensive asparaginase treatment if asparaginase is stopped after a reaction. Thus, the costs per LYS were $1892 for scenario 1 and $872 for scenario 2. CONCLUSIONS: Switching to Erwinia asparaginase increases the costs per LYS by $1020, which is modest in view of the total costs. Moreover, when asparaginase treatment can be completed by switching to Erwinia asparaginase, relapses-and consequential costs-will be avoided. Therefore, from a cost perspective, we recommend a switch to Erwinia asparaginase to complete asparaginase treatment.

Marine microbial L-asparaginase: Biochemistry, molecular approaches and applications in tumor therapy and in food industry.

The marine environment is a rich source of biological and chemical diversity. It covers more than 70% of the Earth's surface and features a wide diversity of habitats, often displaying extreme conditions, where marine organisms thrive, offering a vast pool for microorganisms and enzymes. Given the dissimilarity between marine and terrestrial habitats, enzymes and microorganisms, either novel or with different and appealing features as compared to terrestrial counterparts, may be identified and isolated. L-asparaginase (E.C. 3.5.1.1), is among the relevant enzymes that can be obtained from marine sources. This amidohydrolase acts on L-asparagine and produce L-aspartate and ammonia, accordingly it has an acknowledged chemotherapeutic application, namely in acute lymphoblastic leukemia. Moreover, L-asparaginase is also of interest in the food industry as it prevents acrylamide formation. Terrestrial organisms have been largely tapped for L-asparaginases, but most failed to comply with criteria for practical applications, whereas marine sources have only been marginally screened. This work provides an overview on the relevant features of this enzyme and the framework for its application, with a clear emphasis on the use of L-asparaginase from marine sources. The review envisages to highlight the unique properties of marine L-asparaginases that could make them good candidates for medical applications and industries, especially in food safety.

Catalyzing improvements in ALL therapy with asparaginase.

Asparaginase remains a cornerstone of ALL therapy and is one of the key contributing factors to improved outcomes in adolescent and young adult (AYA) patients treated on pediatric protocols. Asparagine depletion has been associated with improved outcomes in ALL patients; this has led to an increased emphasis on optimizing asparagine depletion in ALL patients of all ages. To ensure adequate asparagine depletion, the use of therapeutic drug monitoring of asparaginase therapy holds much promise, yet remains underutilized in practice. Data regarding asparaginase activity level monitoring and associated outcomes are reviewed, and an evidence-based asparaginase activity level monitoring algorithm is presented. Finally, unique management strategies for key asparaginase toxicities in ALL patients are discussed, as well as a discussion of novel asparaginase formulations on the horizon.

Safety and feasibility of lower antithrombin replacement targets in adult patients with hematological malignancies receiving asparaginase therapy.

The optimal antithrombin(AT) activity parameters for replacement as thromboprophylaxis following asparaginase remains unclear. This single-center, retrospective study evaluated two sets of AT replacement thresholds and targets in adults receiving asparaginase-containing chemotherapy. AT supplementation adhered to institutional standards, which lowered the AT activity target from 100% to 80% in 6/2014. Ninety-two patients were evaluated. Cumulative thrombosis incidence was 16% at 6 months (95%CI:6.8-24.0, maximum follow-up 315 days) with similar incidence between the 80% and 100% target groups, 14% (2 of the 14) and 13% (10 of the 78), respectively, with a small non-Line-Related DVT incidence (3%). Most thrombotic events occurred during induction chemotherapy and demonstrated no associations with replacement target, cumulative days or cumulative area under AT activity target, number of asparaginase doses, or cumulative asparaginase dose. Median estimated AT replacement expenditure was $34,963USD (IQR $16,260USD to $79,319USD) per patient. Cost-effectiveness and optimization of AT replacement for thromboprophylaxis following asparaginase requires prospective evaluation.

Eficacia y seguridad de l-asparaginasa e. Coli pegilada en el tratamiento de pacientes con leucemia linfoblástica aguda que presentan hipersensibilidad a l- asparaginasa e. Coli nativa, en el contexto de no disponibilidad de l-asparaginasa erwinia / Efficacy and safety of ibrutinib in the treatment of patients diagnosed with mantle cell lymphoma, with at least two lines of previous treatment

INTRODUCCIÓN: En la actualidad existe un Dictamen Preliminar de Evaluación de Tecnología Sanitaria N° 016­SDEPFYOTS-DETS-IETSI-2017, "Eficacia y seguridad de L-asparaginasa erwinia y L-asparaginasa E. Coli Pegilada en el tratamiento de pacientes con Leucemia Linfoblástica aguda que presentan hipersensibilidad a L-asparaginasa E. Coli Nativa, en el cual se evaluó la eficacia y seguridad del uso de L-asparaginasa Erwinia y L- asparaginasa E. coli pegilada para el tratamiento de pacientes con leucemia linfoblástica aguda que presentan hipersensibilidad a L- asparaginasa E. coli nativa. TECNOLOGIA SANITARIA DE INTERES: Las células neoplásicas en la leucemia linfoblástica aguda (LLA) no sintetizan las cantidades necesarias del aminoácido L-asparagina; por lo que requieren de fuentes externas (i.e., L-asparagina extracelular). La L-asparaginasa, es una enzima que cataliza la conversión de L-asparagina más agua, en ácido aspártico y amoniaco, ocasionando que los niveles de L-asparagina extracelular disminuyan; y, por lo tanto, las células de la LLA no cuenten con L-asparagina extracelular. Así, estas células neoplásicas se quedan sin fuentes de L-asparagina, y no pueden sintetizar proteínas de gran importancia para su supervivencia, ocasionando su muerte (1,2) . Dentro de los tipos de L-asparaginasa, se encuentra la derivada de Escherichia coli en su forma nativa y en su forma pegilada. La forma pegilada de L-asparaginasa E. coli también se le conoce como pegaspargasa (con nombre comercial Oncaspar), la cual resulta de su conjugación con monometoxi-polietileno glicol. La L-asparaginasa E. coli pegilada surge como respuesta a la necesidad de disminuir la inmunogenicidad ocasionada con la L-asparaginasa nativa y aumentar su vida media (3) . Así, la L-asparaginasa E. coli pegilada tiene una vida media de alrededor de seis días, lo que equivale a casi cinco veces la vida media L-asparaginasa E. coli nativa (4) , haciendo que su dosificación sea distinta. METODOLOGÍA: Se describe en el Dictamen Preliminar de Evaluación de Tecnología Sanitaria N° 016­SDEPFYOTS-DETS-IETSI-2017, "Eficacia y seguridad de L-asparaginasa erwinia y L-asparaginasa E. Coli Pegilada en el tratamiento de pacientes con Leucemia Linfoblástica aguda que presentan hipersensibilidad a L-asparaginasa E. Coli Nativa. RESULTADOS: Según lo notificado por la FDA a nivel mundial y el estudio de posibilidades que ofrece el mercado (EPOM) a nivel nacional realizado por CEABE, en la actualidad no hay disponibilidad de L-asparaginasa Erwinia, dejando sin opción de tratamiento de L-asparaginasa a la población de interés del Dictamen Preliminar de Evaluación de Tecnología Sanitaria N° 016- SDEPFYOTS-DETS-IETSI-2017. CONCLUSIÓN: el Instituto de Evaluación de Tecnologías en Salud e Investigación-IETSI, aprueba el uso de L-asparaginasa E. coli pegilada, en el contexto de no disponibilidad de L-asparaginasa Erwinia, como parte del esquema quimioterapéutico utilizado para el tratamiento de pacientes niños, adolescentes, y adultos con leucemia linfoblástica aguda, que presentan hipersensibilidad a L- asparaginasa E. coli nativa, según lo establecido en el Anexo N° 01. Condiciones de Uso. La vigencia del presente Dictamen Preliminar es de un año a partir de la fecha de publicación; o en su defecto, hasta que haya disponibilidad de L-asparaginasa Erwinia.

Incidence and Management of Toxicity Associated with LAsparaginase in the Treatment of ALL and NK/TCell Lymphoma: an Observational Study.

BACKGROUND: Lasparaginase (ASNase) is commonly used in the treatment of acute lymphoblastic leukemia (ALL) and natural killer (NK)/Tcell lymphoma. This study was designed to describe the incidence of toxicity associated with ASNase in Asian adults. Secondary objectives were to investigate the management and impact of toxicity on subsequent ASNase use, and to compare the actual management against current recommendations. MATERIALS AND METHODS: In this retrospective, multicenter, observational study, Asian patients ≥ 18 years old who received ≥ 1 dose of the native E. coli ASNase from 2008 to 2013 were included. Patients were excluded if they did not receive ASNase. Endpoints of this study were development of specific toxicities, whether ASNase was discontinued or rechallenged, and developmentg of recurrent toxicity. All data analyses were performed using SPSS version 20.0. RESULTS: A total of 56 patients were analyzed. Mean (±SD) age was 36.2 (±15.2) years old, with 62.5% being males, 55.4% with ALL and 28.6% with NK/Tcell lymphoma. Hypersensitivity (12.5%) was associated with the highest incidence of toxicity (6 out of 7 patients had Grade 3 and 4 toxicity), followed by 10.7% for hepatic transaminitis, 3.6% for nonCNS thrombosis and 1.8% each for hyperbilirubinemia and pancreatitis. Hypersensitivity recurred in the 3 patients who were rechallenged with E. coli ASNase. CONCLUSIONS: ASNase is associated with a wide range of toxicities, with hypersensitivity being the most commonly observed among Asian adult patients.

The Impact of Socioeconomic Factors on the Outcome of Childhood Acute Lymphoblastic Leukemia (ALL) Treatment in a Low/Middle Income Country (LMIC).

Survival for childhood acute lymphoblastic leukemia (ALL) has improved significantly, but these benefits may not be available to many children from low and middle income countries, where reasons for treatment failure may be unique to their environment. We retrospectively reviewed data on pediatric (1 to 18 y or younger) patients with newly diagnosed ALL treated over 5 years at a children's cancer hospital in Pakistan. Patients were treated with modified Berlin-Frankfurt-Muenster -based therapy without risk stratification. There were 255 children with a median age of 7 years (mean, 7.65 y) and a male preponderance (M:F=1.6:1). 20% had T-ALL, one-third had white blood cells >50×10/L and 13.7% central nervous system disease. A majority (56.5%) was malnourished. In total, 49 (19.2%) died before the end of induction and 21 died in complete remission. Most deaths were infection-related. A total of 50 patients relapsed and 19 abandoned therapy after complete remission. Five-year overall survival is 52.9% with abandonment censored and 45.8% with abandonment as an event. Overall survival was related to socioeconomic status but not to known risk factors. The outcome of ALL at our center is suboptimal and associated with factors not commonly seen in developed countries. Special attention to early diagnosis, infection control, and parental educational are needed to improve the survival.

Allergic Reactions With Intravenous Compared With Intramuscular Pegaspargase in Children With High-risk Acute Lymphoblastic Leukemia: A Population-based Study From the Maritimes, Canada.

Intravenous (IV) administration of pegaspargase in children with acute lymphoblastic leukemia (ALL) may be associated with an increased risk of allergic reactions, and thus the need for more costly intramuscular (IM) erwinia asparaginase. In 128 patients allergic reactions were documented in 3% and 14% of those who received IM and IV pegaspargase, respectively (P=0.029). These reactions were primarily contributed to by high risk (HR)-ALL patients (P<0.01). The possible decreased efficacy and quality of life and the substantial costs entailed by switching from IV pegaspargase to IM erwinia should prompt reconsideration of the IV administration route for pegaspargase in HR-ALL patients.

Midtreatment ¹8F-FDG PET/CT Scan for Early Response Assessment of SMILE Therapy in Natural Killer/T-Cell Lymphoma: A Prospective Study from a Single Center.

UNLABELLED: In a prospective study of newly diagnosed or relapsed histologically proven extranodal natural killer/T-cell lymphoma (ENKTL) patients, we aimed to determine the accuracy of midtreatment (18)F-FDG PET for response assessment using both visual and quantitative analyses. METHODS: Twenty-four patients (12 men, 12 women; median age, 50 y; age range, 16-83 y) were referred for pre-, mid- (after 2-3 cycles of SMILE [prednisolone, methotrexate, ifosfamide, L-asparaginase, etoposide] chemotherapy), and end-treatment PET/CT scans (n = 24, 24, and 17, respectively) using a standardized protocol. Sixty-five PET/CT scans were analyzed visually using the Deauville 5-point score (DS), and the lesion with the highest maximum standardized uptake value (SUV(max)) was recorded. Survival curves were obtained using Kaplan-Meier analysis and compared using the log rank test, followed by multivariate analysis using the Cox proportional hazards model to assess the independent effects of International Prognostic Index (IPI) score (0-1 vs. 2-5), stage (stage I/II vs. stage III/IV), sex, DS (1-3 vs. 4-5), SUV(max), and change in SUV(max) on overall survival (OS) and progression-free survival (PFS). The mean (±SD) follow-up period was 32 mo (±21 mo). RESULTS: For 2-y OS, the following parameters were predictive: IPI score (P = 0.047), DS at mid- and end-treatment (P < 0.001), and SUV(max) at mid- and end-treatment (P < 0.001 and 0.045, respectively). For 2-y PFS, the following parameters were predictive: sex (P = 0.006), stage (P = 0.034), IPI score (P = 0.038), DS at mid- and end-treatment (P < 0.001 and 0.001, respectively), and SUV(max) at midtreatment (P = 0.001). Multivariate analysis showed DS on mid- and end-treatment scans to be the only significant independent predictor of both OS (P = 0.004 and 0.018, respectively) and PFS (P = 0.004 and 0.014, respectively). The 2-y estimate for OS and PFS was 81% and 62%, respectively, in patients with a DS of 1-3, compared with 17% in patients with a DS of 4-5 (P < 0.001 and 0.001, respectively). The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of the midtreatment DS for prediction of OS and PFS were 63%, 94%, 83%, 83%, and 83%, respectively. CONCLUSION: Midtreatment PET/CT is a valuable tool for early treatment response assessment in extranodal natural killer/T-cell lymphoma patients.

Cost-analysis of treatment of childhood acute lymphoblastic leukemia with asparaginase preparations: the impact of expensive chemotherapy.

Asparaginase is an expensive drug, but important in childhood acute lymphoblastic leukemia. In order to compare costs of PEGasparaginase, Erwinia asparaginase and native E. coli asparaginase, we performed a cost-analysis in the Dutch Childhood Oncology Group ALL-10 medium-risk group intensification protocol. Treatment costs were calculated based on patient level data of 84 subjects, and were related to the occurrence of allergy to PEGasparaginase. Simultaneously, decision tree and sensitivity analyses were conducted. The total costs of the intensification course of 30 weeks were $57,893 in patients without PEGasparaginase allergy (n=64). The costs were significantly higher ($113,558) in case of allergy (n=20) necessitating a switch to Erwinia asparaginase. Simulated scenarios (decision tree analysis) using native E. coli asparaginase in intensification showed that the costs of PEGasparaginase were equal to those of native E. coli asparaginase. Also after sensitivity analyses, the costs for PEGasparaginase were equal to those of native E. coli asparaginase. Intensification treatment with native E. coli asparaginase, followed by a switch to PEGasparaginase, and subsequently to Erwinia asparaginase in case of allergy had similar overall costs compared to the treatment with PEGasparaginase as the first-line drug (followed by Erwinia asparaginase in the case of allergy). PEGasparaginase is preferred over native E. coli asparaginase, because it is administered less frequently, with less day care visits. PEGasparaginase is less immunogenic than native E. coli asparaginase and is not more expensive. Asparaginase costs are mainly determined by the percentage of patients who are allergic and require a switch to Erwinia asparaginase.