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1.	Tulstrup, Morten, et al. (author) Individualized 6-mercaptopurine increments in consolidation treatment of childhood acute lymphoblastic leukemia: A NOPHO randomized controlled trial. 2018 In: European Journal of Haematology. - : Wiley. - 0902-4441 .- 1600-0609. ; 100:1, s. 53-60 Journal article (peer-reviewed)abstract This randomized controlled trial tested the hypothesis that children with non-high-risk acute lymphoblastic leukemia could benefit from individualized 6-mercaptopurine increments during consolidation therapy (NCT00816049). Primary and secondary end points were end of consolidation minimal residual disease (MRD) positivity and event-free survival.392 patients were randomized to experimental and 396 to standard therapy. Patients allocated to standard therapy received oral 6-mercaptopurine (25mg/m(2) /day) from days 30 to 85, while the experimental arm received stepwise increments of additional 25mg/m(2) /day beginning on days 50 and/or 71 unless dose-limiting myelosuppression had occurred.In the experimental arm, 166 patients (42%) received one dose increment, and 62 (16%) received two. Fifty-seven of 387 (15%) patients in the experimental arm were MRD positive at end of consolidation vs 77 of 389 (20%) in the control arm (P=.08). Five-year probability of event-free survival was 0.89 (95% CI: 0.85-0.93) in the experimental arm vs 0.93 (0.90-0.96) in the control arm (P=.13). The median accumulated length of 6-mercaptopurine treatment interruptions was 7 (IQR 2-12) in the experimental arm vs 4 (IQR 0-10) in the control arm (P=.002).This study found no benefit from individualized 6-mercaptopurine increments compared to standard therapy.

Tulstrup, Morten, et al. (author)
Individualized 6-mercaptopurine increments in consolidation treatment of childhood acute lymphoblastic leukemia: A NOPHO randomized controlled trial.
2018
In: European Journal of Haematology. - : Wiley. - 0902-4441 .- 1600-0609. ; 100:1, s. 53-60
Journal article (peer-reviewed)abstract
- This randomized controlled trial tested the hypothesis that children with non-high-risk acute lymphoblastic leukemia could benefit from individualized 6-mercaptopurine increments during consolidation therapy (NCT00816049). Primary and secondary end points were end of consolidation minimal residual disease (MRD) positivity and event-free survival.392 patients were randomized to experimental and 396 to standard therapy. Patients allocated to standard therapy received oral 6-mercaptopurine (25mg/m(2) /day) from days 30 to 85, while the experimental arm received stepwise increments of additional 25mg/m(2) /day beginning on days 50 and/or 71 unless dose-limiting myelosuppression had occurred.In the experimental arm, 166 patients (42%) received one dose increment, and 62 (16%) received two. Fifty-seven of 387 (15%) patients in the experimental arm were MRD positive at end of consolidation vs 77 of 389 (20%) in the control arm (P=.08). Five-year probability of event-free survival was 0.89 (95% CI: 0.85-0.93) in the experimental arm vs 0.93 (0.90-0.96) in the control arm (P=.13). The median accumulated length of 6-mercaptopurine treatment interruptions was 7 (IQR 2-12) in the experimental arm vs 4 (IQR 0-10) in the control arm (P=.002).This study found no benefit from individualized 6-mercaptopurine increments compared to standard therapy.

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