Amgen announced new data demonstrating that adding BLINCYTO® (blinatumomab) to chemotherapy significantly improves disease-free survival (DFS) in newly diagnosed pediatric patients with National Cancer Institute (NCI) standard risk (SR) B-cell acute lymphoblastic leukemia (B-ALL) of average or higher risk of relapse. The data are from a Phase 3 study (AALL1731) conducted by the Children's Oncology Group. The results were simultaneously published in theNew England Journal of Medicine and will be presented during the plenary session on Sunday, Dec.

8, at 2 p.m. PT at the 66thAmerican Society of Hematology (ASH) Annual Meeting & Exposition in San Diego. Based on the results of the first pre-specified interim analysis for efficacy, the study met its primary endpoint of DFS and study randomization was terminated early based on the recommendation from the data and safety monitoring committee due to the benefit observed in the BLINCYTO arm compared to the chemotherapy-only arm. Overall, the 3-year DFS was 96.0% for patients treated with chemotherapy plus BLINCYTO compared to 87.9% for those treated with only chemotherapy.

The hazard ratio (HR) was 0.39 [95% confidence interval (CI) 0.24-0.64], indicating a 61% reduction in the risk of disease relapse, secondary malignant neoplasm or remission death with BLINCYTO. At 3 years, more patients remained alive and cancer free when treated with BLINCYTO plus chemotherapy compared to chemotherapy alone. The addition of BLINCYTO to chemotherapy in standard risk patients resulted in outcomes similar to those previously achieved in only the most favorable pediatric risk subsets.

Among SR-Average patients, 3-year DFS was 97.5% for patients treated with BLINCYTO compared to 90.2% for those treated with only chemotherapy (HR 0.33, CI 0.15-0.69). For SR-High patients, 3-year DFS was 94.1% for those treated with BLINCYTO compared to 84.8% for those treated with only chemotherapy (HR 0.45, 95% CI 0.24-0.85). Safety results are consistent with the known safety profile of BLINCYTO.

BLINCYTO has demonstrated a positive balance of benefits and risks, with only 0.3% of first courses associated with Grade 3+ cytokine release syndrome (CRS) and 0.7% with seizures. A higher risk of infections was observed in the BLINCYTO arm. These results provide the first evidence supporting BLINCYTO for use in the consolidation phase in newly diagnosed pediatric Philadelphia chromosome-negative (Ph-) B-ALL patients.

This first-in-class Bispecific T-cell Engager (BiTE®) therapy is now backed by additional evidence reinforcing its role in redefining a standard of care for both adult and pediatric patients, starting from one month old, regardless of measurable residual disease (MRD) status. The findings further establish BLINCYTO as a versatile first-line consolidation therapy across all ages and treatment backbones. The NCI's Cancer Therapy Evaluation Program (CTEP), which sponsored the study will share data with the U.S. Food and Drug Administration as part of their ongoing communications relating to the trial.