On April 28, 2017 Genmab A/S (Nasdaq Copenhagen: GEN) reported that the European Commission (EC) has granted a marketing authorization for DARZALEX (daratumumab) in combination with lenalidomide and dexamethasone, or bortezomib and dexamethasone, for the treatment of adult patients with multiple myeloma who have received at least one prior therapy (Press release, Genmab, APR 28, 2017, View Source [SID1234518724]). The EC approval follows a positive opinion issued for DARZALEX by the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) in February 2017. This approval also converts the previous conditional marketing authorization for DARZALEX to a full approval. DARZALEX is being developed under an August 2012 agreement in which Genmab granted Janssen an exclusive worldwide license to develop, manufacture and commercialize the product. Schedule your 30 min Free 1stOncology Demo! Genmab will receive milestone payments totaling USD 48 million from Janssen Biotech, Inc. in connection with the first commercial sales of DARZALEX under the expanded label. The sales are expected to occur quickly after the approval. These milestone payments were included in the financial guidance issued by Genmab on February 22, 2017 and therefore there is no change to the company’s financial guidance following this approval.
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"We are very pleased that DARZALEX is now approved in Europe in combination with other standard multiple myeloma therapies and that a far greater number of patients suffering from this incurable disease will now have access to this first-in-class immunotherapy," said Jan van de Winkel, Ph.D., Chief Executive Officer of Genmab.
The positive opinion of the CHMP was based on data from two Phase III studies: the CASTOR study of daratumumab in combination with bortezomib and dexamethasone versus bortezomib and dexamethasone alone in patients with relapsed or refractory multiple myeloma (published in The New England Journal of Medicine in August 2016), and the POLLUX study of daratumumab in combination with lenalidomide and dexamethasone versus lenalidomide and dexamethasone alone in patients with relapsed or refractory multiple myeloma (published in the New England Journal of Medicine in October 2016). Data from two early stage studies also supported the approval: the Phase I MMY1001 study (daratumumab in combination with pomalidomide and dexamethasone) and the Phase I/II GEN503 study (daratumumab in combination with lenalidomide and dexamethasone).
About the CASTOR study
The Phase III CASTOR study included 498 patients who had relapsed or refractory multiple myeloma. Patients were randomized to receive either daratumumab combined with subcutaneous bortezomib (a type of chemotherapy, called a proteasome inhibitor) and dexamethasone (a corticosteroid), or bortezomib and dexamethasone alone. The study met the primary endpoint of improving progression free survival (PFS); Hazard Ratio (HR) = 0.39, 95% CI 0.28-0.53, p<0.0001. Patients who received treatment with daratumumab in combination with bortezomib and dexamethasone had a 61% reduction in risk of their disease progressing, compared to those who did not receive daratumumab. The median PFS for patients treated with daratumumab has not been reached, compared to median PFS of 7.2 months for patients who did not receive daratumumab. Daratumumab also significantly increased the overall response rate (ORR) (83% vs. 63%, p<0.0001), including doubling rates of complete response (CR) or better (19% vs. 9%) and rates of very good partial response (VGPR) or better (59% vs. 29%). The proportion of patients that achieved minimal residual disease (MRD) negative status at the 10-4 threshold (one tumor cell in 10,000 white cells) was 13.5% vs 2.8%, p<0.000006 for patients treated with daratumumab versus patients who did not receive daratumumab. The most common grade 3 or 4 adverse events in patients treated with daratumumab in combination with bortezomib and dexamethasone compared to those who only received bortezomib and dexamethasone were thrombocytopenia (45% vs 33%), anemia (14% vs 16%) and neutropenia (13% vs 4%). Daratumumab-associated infusion-related reactions were reported in 45% of patients, were mostly grade 1/2, and occurred predominantly during the first infusion. This is consistent with the reported safety profile of daratumumab monotherapy and combination therapy of bortezomib and dexamethasone.
About the POLLUX study
The Phase III POLLUX study enrolled 569 patients who had relapsed or refractory multiple myeloma. Patients were randomized to receive either daratumumab combined with lenalidomide (an immunomodulatory drug) and dexamethasone, or lenalidomide and dexamethasone alone. The study met the primary endpoint of improving progression-free survival (PFS) (Hazard Ratio (HR) = 0.37; 95% CI 0.27-0.52; p<0.0001) for patients treated with daratumumab versus patients who did not receive daratumumab. Patients who received treatment with daratumumab in combination with lenalidomide and dexamethasone had a 63% reduction in risk of their disease progressing, compared to those who did not receive daratumumab. The median PFS for patients treated with daratumumab in combination with lenalidomide and dexamethasone has not been reached, compared to an estimated median PFS of 18.4 months for patients who received lenalidomide and dexamethasone alone.
Additionally, daratumumab significantly increased ORR (93% vs. 76%, p<0.0001), including doubling rates of CR or better (43% vs. 19%), as well as rates of VGPR or better (76% vs. 44%). The proportion of patients that achieved minimal residual disease (MRD) negative status at the 10-4 threshold was 29% vs 7.8%, p<0.000001 for patients treated with daratumumab versus patients who did not receive daratumumab. The most common grade 3 or 4 adverse events in patients treated with daratumumab in combination with lenalidomide and dexamethasone versus those who received only lenalidomide and dexamethasone were neutropenia (52% vs 37%), thrombocytopenia (13% vs 14%), and anemia (12% vs 20%). Daratumumab-associated infusion-related reactions occurred in 48% of patients, were mostly grade 1/2, and occurred predominantly during the first infusion. Overall, the reported safety profile was consistent with known toxicities of daratumumab monotherapy and combination therapy of lenalidomide and dexamethasone.
About multiple myeloma
Multiple myeloma is an incurable blood cancer that starts in the bone marrow and is characterized by an excess proliferation of plasma cells.1 Multiple myeloma is the third most common blood cancer in the U.S., after leukemia and lymphoma.2 Approximately 30,330 new patients were expected to be diagnosed with multiple myeloma and approximately 12,650 people were expected to die from the disease in the U.S. in 2016.3 Globally, it was estimated that 124,225 people would be diagnosed and 87,084 would die from the disease in 2015.4 While some patients with multiple myeloma have no symptoms at all, most patients are diagnosed due to symptoms which can include bone problems, low blood counts, calcium elevation, kidney problems or infections.5 Patients who relapse after treatment with standard therapies, including proteasome inhibitors or immunomodulatory agents, have poor prognoses and few treatment options.6
About DARZALEX (daratumumab)
DARZALEX (daratumumab) injection for intravenous infusion is indicated in the United States in combination with lenalidomide and dexamethasone, or bortezomib and dexamethasone, for the treatment of patients with multiple myeloma who have received at least one prior therapy and as a monotherapy for the treatment of patients with multiple myeloma who have received at least three prior lines of therapy, including a proteasome inhibitor (PI) and an immunomodulatory agent, or who are double-refractory to a PI and an immunomodulatory agent.6 DARZALEX is the first monoclonal antibody (mAb) to receive U.S. Food and Drug Administration (FDA) approval to treat multiple myeloma. DARZALEX is indicated in Europe for use in combination with lenalidomide and dexamethasone, or bortezomib and dexamethasone, for the treatment of adult patients with multiple myeloma who have received at least one prior therapy and as monotherapy for the treatment of adult patients with relapsed and refractory multiple myeloma, whose prior therapy included a PI and an immunomodulatory agent and who have demonstrated disease progression on the last therapy. DARZALEX is the first human CD38 monoclonal antibody approved in Europe. For more information, visit www.DARZALEX.com.
Daratumumab is a human IgG1k monoclonal antibody (mAb) that binds with high affinity to the CD38 molecule, which is highly expressed on the surface of multiple myeloma cells. Daratumumab triggers a person’s own immune system to attack the cancer cells, resulting in rapid tumor cell death through multiple immune-mediated mechanisms of action and through immunomodulatory effects, in addition to direct tumor cell death, via apoptosis (programmed cell death).6,7,8,9,10
Daratumumab is being developed by Janssen Biotech, Inc. under an exclusive worldwide license to develop, manufacture and commercialize daratumumab from Genmab. Five Phase III clinical studies with daratumumab in relapsed and frontline multiple myeloma settings are currently ongoing, and additional studies are ongoing or planned to assess its potential in other malignant and pre-malignant diseases on which CD38 is expressed, such as smoldering myeloma, NKT-cell lymphoma, amyloidosis, myelodysplastic syndromes and solid tumors. Daratumumab has received two Breakthrough Therapy Designations from the U.S. FDA, for multiple myeloma, as both a monotherapy and in combination with other therapies.