Amgen – Relapsed/Refractory B-Precursor Acute Lymphoblastic Leukemia

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Primary Objective:

To estimate the incidence of treatment-emergent and treatment-related adverse events during
treatment with blinatumomab in pediatric and adolescent subjects with B-precursor ALL in
second or later bone marrow relapse, in any marrow relapse after alloHSCT, or refractory to
other treatments

Secondary Objective(s):

To describe key efficacy outcomes, including incidence of complete response (CR) within 2
cycles of blinatumomab, minimal residual disease (MRD) remission within 2 cycles of
blinatumomab, relapse free survival (RFS), overall survival (OS), incidence of alloHSCT, and
100-day mortality after alloHSCT.

Hypotheses:

A formal statistical hypothesis will not be tested. The incidence of treatment-emergent and
treatment-related adverse events will be estimated.

Study Endpoints:

– Incidence of treatment-emergent and treatment-related adverse events

– Incidence of CR within 2 cycles of blinatumomab

– MRD remission within 2 cycles of blinatumomab

– RFS

– OS

– Incidence of alloHSCT

– 100-day mortality after alloHSCT

Study Design:

Multi-center, open-label, single-arm expanded access protocol