On November 16, 2018 Amgen (NASDAQ: AMGN) reported that the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) has adopted a positive opinion to expand the current indication for BLINCYTO (blinatumomab) monotherapy to include adult patients with Philadelphia chromosome negative CD19 positive 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, NOV 16, 2018, View Source [SID1234531408]). The application included data from the Phase 2 BLAST study in frontline and relapsed/refractory ALL, the largest prospective trial for MRD-positive ALL ever conducted. BLINCYTO, a bispecific CD19-directed CD3 T cell engager, is the first BiTE immunotherapy to receive regulatory approval globally.
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MRD refers to the presence of cancer cells that remain detectable, despite a patient 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.1-3
"The continued acknowledgment of MRD status as an approvable endpoint is an important step in the larger paradigm shift of ALL management as early intervention within the ALL treatment continuum has been shown to be an important step in eliminating dangerous detectable disease," said David M. Reese, M.D., executive vice president of Research and Development at Amgen. "We appreciate the efforts undertaken by the ALL community to work with regulators and other decision makers on the role of MRD in recurrence of disease and look forward to a final decision by the European Commission."
The CHMP opinion is based on data from the Phase 2 BLAST study, which found that BLINCYTO induced a complete MRD response, or no detectable MRD, in 78 percent of patients within one treatment cycle. Safety results among MRD-positive patients were consistent with the known safety profile of BLINCYTO in relapsed or refractory B-cell precursor ALL.
The CHMP positive opinion will now be reviewed by the European Commission (EC), which has the authority to approve medicines for the European Union (EU). Norway, Iceland and Liechtenstein, as members of the European Economic Area (EEA), will take corresponding decisions based on the decision of the EC. The CHMP previously adopted a negative opinion in July 2018 but revised the opinion following a re-examination request by Amgen.
In March 2018, the U.S. Food and Drug Administration (FDA) approved BLINCYTO 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. BLINCYTO is the first immunotherapy from Amgen’s BiTE platform, an innovative approach that helps the body’s immune system target cancer cells.
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 at any time after the first cycle, if eligible. Efficacy was based on achievement of undetectable MRD within one cycle of BLINCYTO treatment and hematological relapse-free survival (RFS). Additional secondary endpoints included incidence and severity of adverse events, overall survival (OS), time to hematological remission and duration of complete MRD response.
Results from the BLAST study were presented at the 57th American Society of Hematology (ASH) (Free ASH Whitepaper) Annual Meeting & Exposition in 2015 and published in Blood in 2018. Long-term OS data results from the BLAST study will also be featured in an oral presentation during the ASH (Free ASH Whitepaper) 2018 Annual Meeting on Dec. 3.
About ALL and MRD
ALL is a rapidly progressing cancer of the blood and bone marrow that occurs in both adults and children.4,5 Poor outcomes have been observed in patients who achieve first or second complete hematologic remission but have persistent MRD, which remains detectable at the molecular level after treatment.1,6 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.6 For more information about MRD, please visit AmgenOncology.com.
About BiTE Technology
Bispecific T cell engager (BiTE) antibody construct is an innovative technology that can be engineered to target any tumor antigen expressed by any type of cancer. The protein molecules are designed to kill malignant cells using the patient’s own immune system by bridging T cells to tumor cells. BiTE antibody construct helps connect the T cells to the targeted cell, with the intent of causing T cells to inject toxins which trigger cancer cell death (apoptosis). Amgen is developing BiTE antibody constructs to uniquely (or specifically) target numerous hematologic malignancies and solid tumors.
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 effector T cells. BLINCYTO was granted breakthrough therapy and priority review designations by the FDA in 2014, and carries full approval in the U.S. for the treatment of relapsed or refractory B-cell precursor ALL in adults and children. In the U.S., BLINCYTO is 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.
BLINCYTO is now approved in 57 countries, including all member countries in the European Union and the European Economic Area, Canada, Japan, and Australia.
Important EU BLINCYTO (blinatumomab) Safety Information
This product is subject to additional monitoring in the EU. All suspected adverse reactions should be reported in accordance with the national reporting system.
The adverse reactions described in this section were identified in clinical studies of patients with B-precursor ALL (N = 843). The most serious adverse reactions that may occur during blinatumomab treatment include: infections (24.8%), neurologic events (13.8%), neutropenia/febrile neutropenia (10.1%), cytokine release syndrome (3.3%), and tumour lysis syndrome (0.7%). The most common adverse reactions were: pyrexia (69.2%), infusion-related reactions (43.4%), infections – pathogen unspecified (42.1%), headache (32.9%), anaemia (22.8%), thrombocytopenia (20.9%), febrile neutropenia (20.2%), oedema (20.0%), neutropenia (19.7%), rash (16.7%), increased liver hepatic enzymes (16.1%), bacterial infectious disorders (15.4%), tremor (15.2%), cough (15.1%), leukopenia (13.4%), back pain (13.3%), chills (13.0%), hypotension (12.8%), viral infectious disorders (12.7%), decreased immunoglobulins (12.5%), cytokine release syndrome (11.6%), tachycardia (11.3%), insomnia (10.7%), fungal infectious disorders (10.6%) and pain in extremity (10.2%).
Please refer to the Summary of Product Characteristics for full European prescribing information.
Important Safety Information Regarding BLINCYTO (blinatumomab) U.S. Indication
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 for evidence of CRS, 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 of neurological toxicity 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 increase (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).