Improved Outcome of a Pediatric-Inspired Protocol for High-Risk Adolescent and Young Adult Acute Lymphoblastic Leukemia Patients Using Peg-Asparaginase and Escalating Dose of Methotrexate: Tolerability and Outcome

Abstract

Background: Treatment of acute lymphoblastic leukemia (ALL) in adolescent and young adult (AYA) patients using traditional adult chemotherapy protocols give low overall survival (OS) rates. Data are growing regarding the use of pediatric-inspired chemotherapy protocols in AYA patients with improvement in OS.

Patients and methods: To assess efficacy and tolerability of using a pediatric-inspired protocol in AYA patients, we initiated our local prospective trial using a modified version of the Children's Cancer Group 1900 protocol for newly diagnosed high-risk Philadelphia chromosome-negative ALL patients.

Results: A total of 40 patients were enrolled in the study (from 2015 to 2018). The median age was 18 years (range, 14-34 years). The complete remission rate after induction was 37 patients [93%] and after a median follow-up of 5 years, OS, disease-free survival (DFS), and event-free survival were 75%, 72%, and 60%, respectively. Use of this protocol was well tolerated with manageable toxicities. Pegylated asparaginase was given to all patients during the induction phase and was well tolerated.

Conclusion: The use of a pediatric-inspired protocol for high-risk AYA ALL patients was effective and well tolerated with improvement in OS and DFS compared with historical data using adult protocols in such populations.

Keywords: ALL; AYA; Asparaginase; Outcome; Pediatric inspired.