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The Antibody Society

An international non-profit supporting antibody-related research and development.

Risankizumab-rzaa granted FDA approval

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On April 23, 2019, the US Food and Drug Administration approved risankizumab-rzaa (SKYRIZI™) for the treatment of moderate to severe plaque psoriasis in adults who are candidates for systemic therapy or phototherapy. Risankizumab is a humanized IgG1 monoclonal antibody that inhibits interleukin (IL)-23, a cytokine involved in inflammatory processes, by binding to its p19 subunit. SKYRIZI is part of a collaboration between Boehringer Ingelheim and AbbVie, with AbbVie leading development and commercialization of SKYRIZI globally.

The product’s approval is supported by data from four randomized, placebo and/or active-controlled pivotal studies, ultIMMA-1, ultIMMa-2, IMMhance and IMMvent, that evaluated the safety and efficacy of risankizumab in more than 2,000 patients with moderate-to-severe chronic plaque psoriasis. The co-primary endpoints of the studies were Psoriasis Area and Severity Index and static Physician Global Assessment [sPGA] score of clear or almost clear [sPGA 0/1] at 16 weeks versus placebo. In these four studies, all co-primary and ranked secondary outcome measures were met and no new safety signals were observed. Results of the UltIMMa-1 (NCT02684370) and UltIMMa-2 (NCT02684357) studies were reported in The Lancet. Risankizumab was previously approved in Japan and Canada, and a marketing authorization application for risankizumab is currently undergoing regulatory review in the European Union.

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The Antibody Society maintains a comprehensive table of approved mAb therapeutics and those in regulatory review in the EU or US. Please log in to access the table, which is located in the Members Only section and can be downloaded in Excel format. Information about other antibody therapeutics that may enter regulatory review in 2019 can be found in ‘Antibodies to watch in 2019’.

Most read from mAbs, April 2019

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The Antibody Society is pleased and proud to be affiliated with mAbs, a multi-disciplinary journal dedicated to advancing the art and science of antibody research and development. We hope you enjoy these summaries based on the abstracts of the most read papers published in a recent issue. All the articles are open access; PDFs can be freely downloaded by following the links below.

Issue 11.3 (April 2019)

CH2 domain orientation of human immunoglobulin G in solution: Structural comparison of glycosylated and aglycosylated Fc regions using small-angle X-ray scattering

Yageta et al examined the small-angle X-ray scattering (SAXS) profile of the glycosylated Fc region (gFc) and aglycosylated Fc region (aFc) in solution to determine if removal of the N-linked glycan alters the CH2 domain orientation in the Fc region. For both gFc and aFc, the best-fitted SAXS profiles corresponded to ones calculated based on the crystal structure of gFc that formed a “semi-closed” CH2 domain orientation. Collectively, the data indicated that the removal of the N-linked glycan only negligibly affected the CH2 domain orientation in solution. Their findings will guide the development of methodology for the production of highly refined functional Fc variants.

Charge variants characterization and release assay development for co-formulated antibodies as a combination therapy

Characterization of co-formulated biologics can be challenging due to the high degree of similarity in the physicochemical properties of co-formulated proteins, especially at different concentrations of individual components. In this new report, Cao et al present the results of a deamidation study of one monoclonal antibody component (mAb-B) in co-formulated combination antibodies (referred to as COMBO) that contain various ratios of mAb-A and mAb-B. A single deamidation site in the complementarity-determining region of mAb-B was identified as a critical quality attribute (CQA) due to its impact on biological activity. A conventional charge-based method of monitoring mAb-B deamidation presented specificity and robustness challenges, especially when mAb-B was a minor component in the COMBO, making it unsuitable for lot release and stability testing. The authors developed and qualified a new, quality-control-friendly, single quadrupole Dalton mass detector (QDa)–based method to monitor site-specific deamidation. Their approach can be also used as a multi-attribute method for monitoring other quality attributes in COMBO. This analytical paradigm is applicable to the identification of CQAs in combination therapeutic molecules, and to the subsequent development of a highly specific, highly sensitive, and sufficiently robust method for routine monitoring CQAs for lot release test and during stability studies.

Capture and display of antibodies secreted by hybridoma cells enables fluorescent on-cell screening

Puligedda et. al describe a system in which hybridomas specifically capture and display the mAbs they secrete. Using On-Cell mAb Screening (OCMS™), monoclonal antibodies (mAbs) displayed on the cell surface can be rapidly assayed for expression level and binding specificity using fluorescent antigens with high-content (image-based) methods or flow cytometry. OCMS™ demonstrated specific mAb binding to poliovirus and rabies virus by forming a cell surface IgG “cap”, as a universal assay for anti-viral mAbs. The authors produced and characterized OCMS™-enabled hybridomas secreting mAbs that neutralize poliovirus and used fluorescence microscopy to identify and clone a human mAb specific for the human N-methyl-D-aspartate receptor. They also used OCMS™ to assess expression and antigen binding of a recombinant mAb produced in 293T cells.

Physicochemical and functional assessments demonstrating analytical similarity between rituximab biosimilar HLX01 and the MabThera®

As discussed by Xu et al, development of bio-therapeutics has exhibited exponential growth in China over the past decade. However, no biosimilar drug has been approved in China (CN) due to the lack of a national biosimilar regulatory guidance. HLX01, a rituximab biosimilar developed in China under European Medicines Agency biosimilar guidelines and requirements, was the first such drug submitted for regulatory review in China, and it is expected to receive approval there as a biosimilar product. To demonstrate the analytical similarities of HLX01, CN-rituximab (sourced in China but manufactured in Europe) and EU-rituximab (sourced and manufactured in Europe), an extensive 3-way physicochemical and functional similarity assessment using a series of orthogonal and state-of-the-art techniques was conducted, following the similarity requirement guidelines recently published by China’s Center for Drug Evaluation. The results of the similarity study showed an identical protein amino acid sequence and highly similar primary structures between HLX01 and the reference product (RP) MabThera®, along with high similarities in higher order structures, potency, integrity, purity and impurity profiles, biological and immunological binding functions, as well as degradation behaviors under stress conditions. In addition, HLX01 presented slightly lower aggregates and better photostability compared with the RP. Despite slight changes in relative abundance of glycan moieties and heavy chain C-terminal lysine modification, no differences in biological activities and immunological properties were observed between the RP and HLX01. In conclusion, HLX01 is highly similar to CN- and EU-sourced RP in terms of physicochemical properties and biological activities, suggesting similar product quality, efficacy, and safety. The regulatory requirements interpreted and applied towards the HLX01 marketing application sets a precedent for analytical similarity assessment of biosimilar products in China.

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Romosozumab-aqqg granted FDA approval

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On April 9, 2019, the US Food and Drug Administration approved romosozumab-aqqg (Evenity) to treat osteoporosis in postmenopausal women at high risk of bone fractures. Developed by Amgen and UCB, romosozumab is a humanized IgG2 monoclonal antibody that targets sclerostin. This is the second global approval of romosozumab, following its approval in Japan.

FDA’s approval was based the results of the Phase 3 placebo-controlled FRAME and active-controlled ARCH studies. As reported by Amgen, treatment with EVENITY resulted in a significant reduction of new vertebral fracture at 12 months compared to placebo in the FRAME study. This significant reduction in fracture risk persisted through the second year in women who received EVENITY during the first year and transitioned to denosumab compared to those who transitioned from placebo to denosumab. In addition, EVENITY significantly increased bone mineral density (BMD) at the lumbar spine, total hip and femoral neck compared to placebo at 12 months. Following the transition from EVENITY to denosumab at month 12, BMD continued to increase through month 24.

In the ARCH study, treatment with EVENITY for 12 months followed by 12 months of alendronate significantly reduced the incidence of new vertebral fracture at 24 months. EVENITY followed by alendronate significantly reduced the risk of clinical fracture (defined as a composite of symptomatic vertebral fracture and nonvertebral fracture) after a median follow-up of 33 months. EVENITY significantly increased BMD at the lumbar spine, total hip and femoral neck at 12 months compared to alendronate. Twelve months of treatment with EVENITY followed by 12 months of treatment with alendronate significantly increased BMD compared with alendronate alone.

The European Medicines Agency is reviewing a marketing application for romosozumab.

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The Antibody Society maintains a comprehensive table of approved mAb therapeutics and those in regulatory review in the EU or US. Please log in to access the table, which is located in the Members Only section and can be downloaded in Excel format. Information about other antibody therapeutics that may enter regulatory review in 2019 can be found in ‘Antibodies to watch in 2019’.

First approval for risankizumab

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AbbVie has announced that SKYRIZI (risankizumab) was granted its first approval. The Japanese Ministry of Health, Labour and Welfare approved risankizumab for the treatment of plaque psoriasis, generalized pustular psoriasis, erythrodermic psoriasis and psoriatic arthritis in adult patients who have an inadequate response to conventional therapies. AbbVie is leading the development and commercialization of SKYRIZI, which is included in a collaboration with Boehringer Ingelheim.

Risankizumab is a humanized IgG1 monoclonal antibody that targets IL-23. The approval in Japan is based on efficacy and safety data from Phase 2 and Phase 3 clinical trials, sustaIMM, ultIMMa-1 and IMMspire, evaluating SKYRIZI in Japanese patients with plaque psoriasis, generalized pustular psoriasis and erythrodermic psoriasis, as well as a global Phase 2 study in patients with active psoriatic arthritis.

Marketing applications were submitted for risankizumab in both the EU and US, and regulatory decisions are anticipated in the first half of 2019. The European Medicines Agency’s Committee for Medicinal Products for Human Use has announced that it adopted a positive opinion for SKYRIZI for treatment of moderate to severe plaque psoriasis in adult patients who are candidates for systemic therapy.

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The Antibody Society maintains a comprehensive table of approved mAb therapeutics and those in regulatory review in the EU or US. Please log in to access the table, which is located in the Members Only section and can be downloaded in Excel format. Information about other antibody therapeutics that may be approved or enter regulatory review in 2019 can be found in ‘Antibodies to watch in 2019’.

BLA submission started for leronlimab as part of combination therapy for patients with HIV

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CytoDyn Inc. has submitted the non-clinical portion of a biologics license application (BLA) for leronlimab (700 mg dose) in combination with highly active antiretroviral therapy for treatment of patients with human immunodeficientcy virus (HIV).  ‘Rolling’ BLA submission is a benefit of leronlimab’s Fast Track drug designation, which was granted by the US Food and Drug Administration for this indication. CytoDyn is working to complete the clinical, and chemistry, manufacturing and controls sections of the BLA. Leronlimab, a humanized IgG4 monoclonal antibody, blocks CCR5. The chemokine receptor CCR5 is the principal HIV co-receptor, but it has potential as a drug target for other diseases, such as cancer and immune-mediated disorders.

As recently announced by CytoDyn, clinical study data has shown that a weekly dose of 525 mg and 700 mg of leronlimab yielded approximately a 90% response rate for HIV-infected patients who pass the first 10 weeks of monotherapy without virologic failure. Approximately 30% of patients fail within the first 10 weeks of monotherapy on a 525 mg dosage and 17% at a dosage of 700 mg. Patients who pass the first 10 weeks of monotherapy on a 525 mg dose have reached an average total of 32 weeks with sustained viral load suppression.

CytoDyn is also developing leronlimab as a treatment for graft-vs.-host disease (GVHD) and triple-negative breast cancer. A Phase 2 study (NCT02737306 ) of the safety and efficacy of leronlimab for prophylaxis of acute GVHD in patients undergoing reduced intensity conditioning allogeneic stem-cell transplantation has an estimated primary completion date of December 2019.  A Phase 1b/2 study (NCT03838367) of leronlimab combined with carboplatin in patients with CCR5+ metastatic triple negative breast cancer is not yet recruiting patients.

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The Antibody Society maintains a comprehensive table of approved mAb therapeutics and those in regulatory review in the EU or US. Please log in to access the table, which is located in the Members Only section and can be downloaded in Excel format. Information about other antibody therapeutics that may enter regulatory review in 2019 can be found in ‘Antibodies to watch in 2019’.