ARC West London member and global leader in the development of immunoglobulin E (IgE) antibodies to treat cancer, Epsilogen, together with Lonza, have successfully completed Good Manufacturing Practice (GMP) of MOv18, an IgE antibody targeting ovarian cancer. It is the first time GMP manufacturing of a Therapeutic IgE antibody has been achieved at scale.

IgE antibodies represent powerful alternatives to more commonly used IgG antibodies. They bring exciting opportunities for oncology thanks to their strong potency, long tissue half-life, and the ability to target tumour cells expressing very low antigen levels. Current research and monitoring indicate that this is the first time GMP manufacturing of a therapeutic IgE antibody has been completed at scale. Epsilogen intends to use this new material for its upcoming Phase Ib study in platinum-resistant ovarian cancer (PROC) patients, scheduled to start later in 2024.

Dr. Tim Wilson, Chief Executive Officer, Epsilogen, commented: “The successful GMP manufacture at scale of MOv18 IgE marks another major milestone in realizing the potential of IgE antibodies as a new and differentiated class of cancer therapies for the treatment of patients with solid tumours. Decades of technical achievement and financial investment have made GMP manufacture of the IgG class of therapeutic antibodies a routine process. Lonza and Epsilogen have worked together to apply Lonza’s knowledge and experience to MOv18 IgE. As a part of the IgE antibody class, it is structurally and functionally distinct from IgG. It is very gratifying to see this effort and investment pay off.

Having generated encouraging safety and tolerability data in our Phase I safety study for MOv18 IgE in patients with platinum-resistant ovarian cancer, we look forward to exploring further the signals of efficacy observed in that clinical trial and anticipate starting a Phase Ib efficacy study in this setting later in 2024. We remain optimistic about the potential of IgE antibodies as a new treatment modality to improve outcomes for patients with difficult-to-treat cancers.”

Stefan Egli, Global Head of Mammalian Biologics, Lonza, added: “This marks a significant milestone for Epsilogen, bringing its promising IgE-based product closer to the clinic. Having produced the GMP batch of this non-platform complex molecule under record time is also a statement that demonstrates the strategic value of our manufacturing services offering tailored to each molecule’s unique properties, and analytical and purification needs.”

MOv18 IgE targets the folate receptor alpha (FR alpha) antigen and Epsilogen believes that this was the first, and remains the only, IgE antibody in clinical development. Epsilogen has successfully completed a Phase I safety study of MOv18 IgE in platinum-resistant ovarian cancer patients where it was found to be safe and well-tolerated, with evidence of anti-tumour activity observed. This study and its results were reported in Nature Communications.


Epsilogen has taken the remaining suite in Motherlabs, ARC’s accelerator space at its West London Campus, as it continues to develop IgE antibodies as a new class of anti-cancer drug following a successful initial clinical trial of the Company’s lead antibody drug candidate MOv18 IgE.

Motherlabs, has fully fitted and managed private suites and write up spaces with a flexible lease structure, shared facilities, and dedicated lab manager, to help ensure its members get up and running quickly, grow sustainably, innovate, and move ideas from concept, to lab, to commercialisation at pace.  ARC has ambitious plans to roll out Motherlabs across its existing 1.6 million sq. ft cluster network, including at Harwell Science and Innovation Campus, and Oxford where a further 3.7m sq. ft of development is already planned, to ease the demand supply imbalance for lab space across the burgeoning life sciences sector.

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