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Research Article: Our Experiences with Asparaginase Activity Measurements in Children with Lymphoblastic Diseases

Date Published: 2023-07-02

Abstract:
Background: Asparaginase is a key component of chemotherapy protocols for the treatment of lymphoblastic malignancies among children. Adequate asparagine depletion is an important factor to achieve optimal therapeutic outcomes. Methods: Over a 3.5 year period, 106 patients were monitored for asparaginase activity (329 samples) in a single center of the Hungarian Pediatric Oncology–Hematology Group. In Hungary, three asparaginase products are available: native E. coli ASNase (Kidrolase), a pegylated form of this enzyme (Pegaspargase) and another native product from Erwinia chrysanthemi (Erwinase). A retrospective data analysis was performed. Results: In 81% (268/329) of our patients, AEA levels were in the optimal therapeutic range of over 100 IU/L. Of 106 patients, 13 (12%) were diagnosed with ‘silent inactivation’. Conclusions: Monitoring of AEA can help to identify patients with ‘silent inactivation’ and their asparaginase therapy can thus be optimized.

Introduction:
Treatment of lymphoblastic malignancies among children has a high success rate, with acute lymphoblastic leukemia (ALL) having an overall survival approaching 90% and lymphoblastic lymphoma (LBL) with 80% [1,2,3]. This success is partly due to the use of an intensive combination of chemotherapeutic agents, and one of them is asparaginase (ASNase).

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