DotBio

Advanced cancers typically suppress the immune response by multiple mechanisms. By carefully engineering multi-functional antibody therapies, there is the potential for more effective treatment. Multi-functional antibodies are single antibody molecules that perform several functions in a synergistic manner, such as tumor targeting while activating T-cells, tumor targeting while blocking immunosuppressive cytokines, or simultaneously blocking tumor growth receptors and tumor immune-resistance receptors while activating NK cells, etc. By being more targeted towards the tumor and its microenvironment, these antibodies could also lower systemic side-effects.

Cancer is the second leading cause of death worldwide, with 18 million new cases in 2018 and 9.6 million deaths. Breast cancer is the leading cause of cancer mortality among women, while lung cancer leads for men. Recent breakthroughs in reactivating the tumor immune response via check-point blockade inhibitors, for example, have led to dramatic long-term responses for some cancer types, but immunotherapies are still not effective for most advanced cancers. A key reason is that tumor cells can overexpress and release a multitude of signaling molecules that reshape the behavior of immune cells in the tumor microenvironment. Multi-functional antibody therapies have the potential to very significantly expand the horizon for immunotherapies in cancer by providing a more refined control of the tumor immune response.

Making multi-functional antibodies is challenging and currently requires a very comprehensive protein engineering effort. This leads to few multi-functional antibody therapies being tested in preclinical studies, which then endure long development cycles before new therapies reach patients. DotBio has developed a modular and combinatorial approach to make multi-functional antibodies, where pre-made building blocks – each targeting a key protein in the tumor and its microenvironment – can be readily connected to generate multi-functional antibodies. This is made possible by DotBio’s proprietary CoFi stabilization and DotBody antibody technologies, which serve as the basis for DotBio’s multi-functional antibody discovery platform.

Using this unique approach, hundreds of prototype multi-functional antibodies can be generated in parallel and tested pre-clinically. This allows for the rapid identification of optimal therapeutic candidates with improved immunostimulatory properties while minimizing risks in the subsequent clinical trials. Additionally, by simultaneously testing many alternative multi-functional antibodies, DotBio is generating a knowledge database with new insights on the interplay between different mechanisms involved in the reshaping of the tumor immune response. This can drive the discovery of further improved multi-functional antibody therapies.

Intellectual property: Exclusive worldwide licenses for the CoFi stabilization and DotBody antibody technologies and their related patents and patent applications, as well as proprietary phage display DotBody libraries. Additional intellectual property under development includes three multifunctional antibodies validated in animal models, as well as several additional antibodies in early-stage development.

Antibody Assets:

• DB002 is a bi-functional antibody targeting immunosuppressive receptors PDL1 (overexpressed by certain tumors) and CTLA4 (overexpressed by immune regulatory cells), with a unique mode of action. It shows efficacy in non-small cell lung cancer tumor xenograft animal models and favourable pharmacokinetics in animals.
• DB003 and DB005 target PDL1 as well as different innovative cytokines that are linked to resistance by preventing immune reactivation. They show efficacy in triple-negative breast cancer and non-small cell lung cancer tumor xenograft models in animals. They are currently undergoing additional efficacy testing against diverse tumor types.

Clinical development plans: the goal is to pursue at least one of these therapeutic candidates towards IND-filing and Phase I clinical trials, while other assets continue their pre-clinical development. IND-enabling studies (process development, large-animal toxicology and GMP manufacturing) are planned and awaiting further funding. Partnerships with public and private medical institutions could help accelerate the clinical development of these candidates, to bring therapeutic benefits to patients that urgently need them.