Willem Mulder
Willem Mulder

Willem Mulder appointed professor of Precision Medicine

He develops new drugs for immunotherapy against cancer, inflammation, rejection reactions and infectious diseases. Intensive collaborations with TU Eindhoven and the biotech incubator BioTrip enable efficient drug development from the lab table to the patient.

Willem Mulder has been appointed professor at the Department of Internal Medicine of the Radboudumc. He was previously a tenured professor at the Icahn School of Medicine in New York, at the Amsterdam UMC and currently also is professor at Eindhoven University of Technology (TU/e). Mulder: ‘By converging medicine, engineering and entrepreneurship, my ambition is to make new therapeutics available to patients. We created a unique opportunity for drug innovation. By taking advantage of clinical and immunology knowhow at Radboudumc, we develop new technologies at the TU/e, and through our newly established biotech incubator BioTrip we work on clinical translation.’

Courier service

Mulder and his team develop immunotherapy against cancer, inflammation, post-transplant rejection reactions and infectious diseases, such as COVID-19. They do not directly target disease, but instead therapeutically regulate the immune system so that our own body can tackle the disease. ‘Different diseases require different applications of immunotherapy’, Mulder says. ‘For cancer, you want to activate immune cells to start clearing up the disease. Conversely, after an organ transplantion, you want to inhibit immune cell activity so that the body doesn't reject the new organ.’

Mulder’s immunotherapies are based on our body’s own nanodelivery vehicles that specifically interact with immune cells. Those natural nanomaterials are loaded with therpautics. Thus, they act as a kind of courier service in the body to deliver these therapeutic cargos. Those cargos include different types of RNA or immunoregulatory proteins, which after they are delivered to immune cells can do their job. In this way, immune cells are prompted to take certain actions.

Innate defenses

The researchers control the immune response at a very early stage. ‘We focus on the innate part of our immune system, less on the acquired part’, Mulder explains. ‘When an organ is transplanted, for example, the current standard treatment consists of drugs that suppress the activated immune system. But this makes people susceptible to infections and developing cancer. What we do is preventing the immune system from becoming activated altogether by for example targeting precursors of immune cells in the bone marrow.’

And with success: for example, in collaboration with the Mass General Transplant Center in Boston, two large animals that received immunotherapy treatment developed in Mulder’s lab, have been living for over two years with a transplanted heart, without ever receiving traditional immunosuppressive drugs. Mulder is working with Trained Therapeutix Discovery (a Radboudumc biotech) on translating this technology to humans.


The technology Mulder’s TU Eindhoven lab developed into intellectual property is further developed in the biotechnology firm BioTrip. Mulder: ‘BioTrip is a biotech incubator, which we founded together with Radboudumc and TU Eindhoven to found new companies and develop the intellectual property into real-life drugs for patients.’

Mulder (Mexico City, 1976) studied chemistry at Utrecht University and received his doctorate in biomedical engineering at Eindhoven University of Technology. He worked at several renowned institutes and received many grants for his research, including NIH grants, NWO Vidi and Vici grants, and an ERC Advanced Grant. In addition to his position at Radboudumc, Mulder also holds a part-time appointment at TU/e and founded Trained Therapeutix Discovery and BioTrip.

The appointment takes effect on September 1st and is for a period of 5 years.

Contact information

Would you like to learn more? Please contact Radboud University Science Communication on +31 (0)24 361 6000, media [at] ru.nl (media[at]ru[dot]nl)