and solution for infusion
Photo courtesy of Amgen
The European Commission (EC) has granted conditional marketing authorization for blinatumomab (Blincyto) to treat adults with Philadelphia chromosome-negative (Ph-) relapsed or refractory B-precursor acute lymphoblastic leukemia (ALL).
This applies to the 28 member countries of the European Union as well as Iceland, Lichtenstein, and Norway.
Conditional marketing authorizations are valid for 1 year, on a renewable basis. The holder is required to complete ongoing studies or conduct new studies with the goal of confirming that a drug’s benefit-risk balance is positive.
Conditional marketing authorization is converted to a full authorization once these commitments have been fulfilled.
The EC granted conditional marketing authorization for blinatumomab based on a pair of phase 2 trials—Study ‘211 and Study ‘206.
Study ‘211
Results of Study ‘211 were presented at EHA 2014. The trial included 189 patients with Ph- relapsed or refractory B-precursor ALL.
The primary endpoint was complete remission or complete remission with partial hematologic recovery (CR/CRh). About 43% of patients achieved this endpoint within 2 cycles of therapy.
According to researchers, the most serious adverse events in this study were infection (31.7%), neurologic events (16.4%), neutropenia/febrile neutropenia (15.3%), cytokine release syndrome (CRS, 0.5%), and tumor lysis syndrome (0.5%).
Study ‘206
Results of Study ‘206 were presented at ASCO 2012. The trial included 36 patients with relapsed or refractory B-precursor ALL.
In this trial, the CR/CRh rate was 69.4% (25/36), with 15 patients achieving a CR (41.7%), and 10 patients achieving CRh (27.8%).
The “medically important” adverse events in this study, according to researchers, were CRS (n=3), central nervous system (CNS) events (3 seizures and 3 cases of encephalopathy), and fungal infection resulting in death (n=1).
However, the researchers found they could prevent CRS with dexamethasone. In addition, the CNS events were reversible, and blinatumomab could be reintroduced in 4 of the 6 patients with CNS events.
About blinatumomab
Blinatumomab is a bispecific T-cell engager (BiTE®) antibody construct that binds to CD19 on the surface of B cells and CD3 on the surface of T cells.
BiTE antibody constructs are intended to help the immune system detect and target malignant cells. The modified antibodies are designed to engage 2 different targets simultaneously, thereby juxtaposing T cells to cancer cells.
BiTE antibody constructs help place the T cells within reach of the targeted cells, with the intent of allowing T cells to inject toxins and trigger apoptosis in the cancer cells.
Blinatumomab was granted orphan drug designation by the European Medicines Agency in 2009 for the treatment of ALL.
The drug was granted breakthrough therapy designation and priority review by the US Food and Drug Administration.
Blinatumomab has conditional approval in the US to treat patients with relapsed or refractory Ph- B-precursor ALL. Continued approval for this indication may be contingent upon verification of clinical benefit in subsequent trials.
Blinatumomab is being developed by Amgen.
