On March 29, 2018 Amgen (NASDAQ:AMGN) reported that the U.S. Food and Drug Administration (FDA) has approved the supplemental Biologics License Application (sBLA) for BLINCYTO (blinatumomab) for the treatment of adults and children with B-cell precursor acute lymphoblastic leukemia (ALL) in first or second complete remission with minimal residual disease (MRD) greater than or equal to 0.1 percent (Press release, Amgen, MAR 29, 2018, View Source;p=RssLanding&cat=news&id=2340390 [SID1234525475]). This indication is approved under accelerated approval based on MRD response rate and hematological relapse-free survival (RFS). Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory trials. BLINCYTO, the first-and-only approved bispecific CD19-directed CD3 T cell engager (BiTE) immunotherapy, is now also the first-and-only therapy to be FDA-approved for MRD.
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MRD refers to the presence of cancer cells that remain detectable, despite a patient’s having achieved complete remission by conventional assessment.1 MRD is only measurable through the use of highly sensitive testing methods that detect cancer cells in the bone marrow with a sensitivity of at least one cancer cell in 10,000 cells — versus about one in 20 with a conventional microscope-based evaluation.1,2,3
"Until today, no therapy has been satisfactory in eradicating MRD or approved specifically to treat this high-risk patient population," said David M. Reese, M.D., senior vice president of Translational Sciences and Oncology at Amgen. "This approval not only supports the use of BLINCYTO earlier in the ALL treatment continuum, but represents a paradigm shift in the management of ALL."
"The detection of remaining cancer cells after a complete remission is the strongest prognostic factor for relapse in patients with ALL. It’s critical to test for and know your patients’ MRD status, because we know that treating to MRD-negativity will help to obtain better possible clinical outcomes for patients," said Elias Jabbour, M.D., associate professor, Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston. "In the BLAST study, blinatumomab led to no detectable cancer cells in approximately 80 percent of patients with MRD-positive ALL. This approval provides a much-needed treatment option to destroy the remaining detectable traces of leukemia."
The accelerated approval is based on results from the Phase 2 single-arm BLAST study (n=86), which found that BLINCYTO converted most patients to an MRD-negative state after a single cycle of therapy. BLINCYTO met the primary endpoint, inducing a complete MRD response, which is no detectable MRD, in 81 percent of patients (95 percent CI: 71.6, 89.0). Median hematological RFS was 22.3 months.
Safety results among MRD-positive patients were consistent with the known safety profile of BLINCYTO in relapsed or refractory B-cell precursor ALL. The most common adverse reactions (greater than 20 percent) were pyrexia, infusion related reactions, headache, infections (pathogen unspecified), tremor and chills.
The FDA-approved prescribing information for BLINCYTO includes a boxed warning for cytokine release syndrome and neurologic toxicities. BLINCYTO is also under a risk evaluation and mitigation strategy (REMS) program in the U.S.
About BLINCYTO (blinatumomab)
BLINCYTO is a bispecific CD19-directed CD3 T cell engager (BiTE) immunotherapy that binds to CD19 expressed on the surface of cells of B-lineage origin and CD3 expressed on the surface of T cells. BLINCYTO was granted breakthrough therapy and priority review designations by the FDA in 2014, and is now fully approved in the U.S. for the treatment of relapsed or refractory B-cell precursor ALL in adults and children. BLINCYTO is now also approved under accelerated approval for the treatment of adults and children with B-cell precursor ALL in first or second complete remission with MRD greater than or equal to 0.1 percent. This indication is approved under accelerated approval based on MRD response rate and hematological relapse-free survival (RFS). Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory trials.
In November 2015, BLINCYTO was granted conditional marketing authorization in the European Union for the treatment of adults with Philadelphia chromosome-negative (Ph-) relapsed or refractory B-cell precursor ALL. Additional regulatory applications for BLINCYTO are underway and have been submitted to health authorities worldwide.
About the BLAST Study
The BLAST study is the largest ever prospective trial in patients with MRD-positive ALL. It is an open-label, multicenter, single-arm, Phase 2 study evaluating the efficacy, safety and tolerability of BLINCYTO in adult patients with MRD-positive B-cell precursor ALL in complete hematologic remission after three or more cycles of intensive chemotherapy. Patients received continuous IV infusion of BLINCYTO 15 μg/m2/d for four weeks, followed by two weeks off. Patients received up to four cycles of treatment and could undergo hematopoietic stem cell transplantation (HSCT) at any time after the first cycle, if eligible. The primary endpoint was the rate of complete MRD response within the first treatment cycle. The key secondary endpoint was RFS at 18 months. Additional secondary endpoints included incidence and severity of adverse events, overall survival (OS), time to hematological remission and duration of complete MRD response.
To evaluate the association between complete MRD response and subsequent RFS and OS, landmark analyses were performed at 45 days (day by which all first cycle MRD responses had been assessed) for patients with and without a complete MRD response in the first cycle. Patients who relapsed, died, or were censored before day 45 were excluded to correct for immortal time bias. Improvement in median RFS was seen for BLINCYTO patients achieving a complete MRD response compared to MRD nonresponses, 23.6 months versus 5.7 months, respectively (p=0.002).
Results from the BLAST study were presented at the 57th Annual Meeting and Exposition of the American Society of Hematology (ASH) (Free ASH Whitepaper) in 2015 and published in Blood in 2018.
About ALL and MRD
ALL is a rare and rapidly progressing cancer of the blood and bone marrow that occurs in both adults and children.4,5 Nearly 50 percent of adult patients and 25 percent of pediatric patients with B-cell ALL eventually relapse or are refractory to treatment.6,7 Poor outcomes have been observed in patients who relapse after achieving a complete response but have persistent MRD, or disease that remains at the molecular level after treatment.1,8 Five-year OS rates are as high as 75 percent for patients that achieve MRD-negative status, compared with 33 percent among patients that remain MRD-positive.8 In pediatric patients, MRD-positive status after treatment is associated with a 15-times higher risk of relapse compared with those with undetectable residual disease.9 For more information about MRD, please visit AmgenOncology.com.
About BiTE Technology
Bispecific T cell engager (BiTE) antibody constructs are a type of immunotherapy being investigated for fighting cancer by helping the body’s immune system to detect and target malignant cells. The modified antibodies are designed to bridge T cells to tumor cells, using the patient’s own immune system to eradicate cancer. BiTE antibody constructs help place the T cells within reach of the targeted cell, with the intent of causing T cells to inject toxins and trigger the cancer cell to die (apoptosis). BiTE antibody constructs are currently being investigated for their potential to treat a wide variety of cancers.
BLINCYTO U.S. Product Safety Information
Indication and Important Safety Information, including Boxed WARNINGS, for BLINCYTO (blinatumomab) for injection, for intravenous use
INDICATION
BLINCYTO is indicated for the treatment of adults and children with:
B-cell precursor acute lymphoblastic leukemia (ALL) in first or second complete remission with minimal residual disease (MRD) greater than or equal to 0.1%. This indication is approved under accelerated approval based on MRD response rate and hematological relapse-free survival. Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory trials.
Relapsed or refractory B‑cell precursor acute lymphoblastic leukemia (ALL)
IMPORTANT SAFETY INFORMATION
WARNING: CYTOKINE RELEASE SYNDROME and NEUROLOGICAL TOXICITIES
Cytokine Release Syndrome (CRS), which may be life-threatening or fatal, occurred in patients receiving BLINCYTO. Interrupt or discontinue BLINCYTO as recommended.
Neurological toxicities, which may be severe, life-threatening or fatal, occurred in patients receiving BLINCYTO. Interrupt or discontinue BLINCYTO as recommended.
Contraindications
BLINCYTO is contraindicated in patients with a known hypersensitivity to blinatumomab or to any component of the product formulation.
Warnings and Precautions
Cytokine Release Syndrome (CRS): CRS, which may be life-threatening or fatal, occurred in patients receiving BLINCYTO. The median time to onset of CRS is 2 days after the start of infusion. Closely monitor patients for signs and symptoms of serious adverse events such as fever, headache, nausea, asthenia, hypotension, increased alanine aminotransferase (ALT), increased aspartate aminotransferase (AST), increased total bilirubin (TBILI), and disseminated intravascular coagulation (DIC). The manifestations of CRS after treatment with BLINCYTO overlap with those of infusion reactions, capillary leak syndrome (CLS), and hemophagocytic histiocytosis/macrophage activation syndrome (MAS). In clinical trials of BLINCYTO, CRS was reported in 15% of patients with relapsed or refractory ALL and in 7% of patients with MRD-positive ALL. Interrupt or discontinue BLINCYTO as outlined in the PI.
Neurological Toxicities: Approximately 65% of patients receiving BLINCYTO in clinical trials experienced neurological toxicities. The median time to the first event was within the first 2 weeks of BLINCYTO treatment and the majority of events resolved. The most common (≥ 10%) manifestations of neurological toxicity were headache and tremor. Severe, life‐threatening, or fatal neurological toxicities occurred in approximately 13% of patients, including encephalopathy, convulsions, speech disorders, disturbances in consciousness, confusion and disorientation, and coordination and balance disorders. Manifestations of neurological toxicity included cranial nerve disorders. Monitor patients for signs or symptoms and interrupt or discontinue BLINCYTO as outlined in the PI.
Infections: Approximately 25% of patients receiving BLINCYTO in clinical trials experienced serious infections such as sepsis, pneumonia, bacteremia, opportunistic infections, and catheter-site infections, some of which were life-threatening or fatal. Administer prophylactic antibiotics and employ surveillance testing as appropriate during treatment. Monitor patients for signs or symptoms of infection and treat appropriately, including interruption or discontinuation of BLINCYTO as needed.
Tumor Lysis Syndrome (TLS), which may be life-threatening or fatal, has been observed. Preventive measures, including pretreatment nontoxic cytoreduction and on-treatment hydration, should be used during BLINCYTO treatment. Monitor patients for signs and symptoms of TLS and interrupt or discontinue BLINCYTO as needed to manage these events.
Neutropenia and Febrile Neutropenia, including life-threatening cases, have been observed. Monitor appropriate laboratory parameters (including, but not limited to, white blood cell count and absolute neutrophil count) during BLINCYTO infusion and interrupt BLINCYTO if prolonged neutropenia occurs.
Effects on Ability to Drive and Use Machines: Due to the possibility of neurological events, including seizures, patients receiving BLINCYTO are at risk for loss of consciousness, and should be advised against driving and engaging in hazardous occupations or activities such as operating heavy or potentially dangerous machinery while BLINCYTO is being administered.
Elevated Liver Enzymes: Transient elevations in liver enzymes have been associated with BLINCYTO treatment with a median time to onset of 3 days. In patients receiving BLINCYTO, although the majority of these events were observed in the setting of CRS, some cases of elevated liver enzymes were observed outside the setting of CRS, with a median time to onset of 19 days. Grade 3 or greater elevations in liver enzymes occurred in approximately 7% of patients outside the setting of CRS and resulted in treatment discontinuation in less than 1% of patients. Monitor ALT, AST, gamma-glutamyl transferase (GGT), and TBILI prior to the start of and during BLINCYTO treatment. BLINCYTO treatment should be interrupted if transaminases rise to > 5 times the upper limit of normal (ULN) or if TBILI rises to > 3 times ULN.
Pancreatitis: Fatal pancreatitis has been reported in patients receiving BLINCYTO in combination with dexamethasone in clinical trials and the post-marketing setting. Evaluate patients who develop signs and symptoms of pancreatitis and interrupt or discontinue BLINCYTO and dexamethasone as needed.
Leukoencephalopathy: Although the clinical significance is unknown, cranial magnetic resonance imaging (MRI) changes showing leukoencephalopathy have been observed in patients receiving BLINCYTO, especially in patients previously treated with cranial irradiation and antileukemic chemotherapy.
Preparation and administration errors have occurred with BLINCYTO treatment. Follow instructions for preparation (including admixing) and administration in the PI strictly to minimize medication errors (including underdose and overdose).
Immunization: Vaccination with live virus vaccines is not recommended for at least 2 weeks prior to the start of BLINCYTO treatment, during treatment, and until immune recovery following last cycle of BLINCYTO.
Risk of Serious Adverse Reactions in Pediatric Patients due to Benzyl Alcohol Preservative: Serious and fatal adverse reactions including "gasping syndrome," which is characterized by central nervous system depression, metabolic acidosis, and gasping respirations, can occur in neonates and infants treated with benzyl alcohol-preserved drugs including BLINCYTO (with preservative). When prescribing BLINCYTO (with preservative) for pediatric patients, consider the combined daily metabolic load of benzyl alcohol from all sources including BLINCYTO (with preservative) and other drugs containing benzyl alcohol. The minimum amount of benzyl alcohol at which serious adverse reactions may occur is not known. Due to the addition of bacteriostatic saline, 7-day bags of BLINCYTO solution for infusion with preservative contain benzyl alcohol and are not recommended for use in any patients weighing < 22 kg.
Adverse Reactions
The most common adverse reactions (≥ 20%) in clinical trial experience of patients with MRD-positive B-cell precursor ALL (BLAST Study) treated with BLINCYTO were pyrexia, infusion related reactions, headache, infections (pathogen unspecified), tremor, and chills. Serious adverse reactions were reported in 61% of patients. The most common serious adverse reactions (≥ 2%) included pyrexia, tremor, encephalopathy, aphasia, lymphopenia, neutropenia, overdose, device related infection, seizure, and staphylococcal infection.
The most common adverse reactions (≥ 20%) in clinical trial experience of patients with Philadelphia chromosome-negative relapsed or refractory B-cell precursor ALL (TOWER Study) treated with BLINCYTO were infections (bacterial and pathogen unspecified), pyrexia, headache, infusion-related reactions, anemia, febrile neutropenia, thrombocytopenia, and neutropenia. Serious adverse reactions were reported in 62% of patients. The most common serious adverse reactions (≥ 2%) included febrile neutropenia, pyrexia, sepsis, pneumonia, overdose, septic shock, CRS, bacterial sepsis, device related infection, and bacteremia.
Adverse reactions that were observed more frequently (≥ 10%) in the pediatric population compared to the adult population were pyrexia (80% vs. 61%), hypertension (26% vs. 8%), anemia (41% vs. 24%), infusion-related reaction (49% vs. 34%), thrombocytopenia (34% vs. 21%), leukopenia (24% vs. 11%), and weight increased (17% vs. 6%).
In pediatric patients less than 2 years old (infants), the incidence of neurologic toxicities was not significantly different than for the other age groups, but its manifestations were different; the only event terms reported were agitation, headache, insomnia, somnolence, and irritability. Infants also had an increased incidence of hypokalemia (50%) compared to other pediatric age cohorts (15-20%) or adults (17%).
Dosage and Administration Guidelines
BLINCYTO is administered as a continuous intravenous infusion at a constant flow rate using an infusion pump which should be programmable, lockable, non-elastomeric, and have an alarm.
It is very important that the instructions for preparation (including admixing) and administration provided in the full Prescribing Information are strictly followed to minimize medication errors (including underdose and overdose).
Please see full Prescribing Information, including Boxed WARNINGS and Medication Guide, for BLINCYTO