November 18, 2019

Potential new approach to T-cell therapy shows early promise in the lab

Drs. Yonghong Wan and Scott Walsh
Drs. Yonghong Wan and Scott Walsh

McMaster University researchers validate a new treatment approach that could help bring the benefits of Adoptive T-cell therapies to patients with solid tumours

Adoptive T-cell therapy (ACT) is an emerging form of immunotherapy that uses a patient’s own re-engineered immune cells to eliminate their cancer. Although ACT is effective against specific types of cancer, like certain blood cancers, these therapies are ineffective against the majority of common tumours.

Researchers at McMaster University are developing a new combination approach that could overcome the limitations of current ACT, and bring the benefits of this promising therapy to many more patients.

The approach, as recently described in The Journal of Clinical Investigation, combines ACT with specially-designed vaccines, called oncolytic virus vaccines (OVVs), to bring about the complete destruction of a solid tumour.

Dr. Scott Walsh, Postdoctoral Fellow in Dr. Yonghong Wan’s lab at McMaster University and first author of the publication, describes the “push and pull” mechanism behind their combination approach.

“We found that oncolytic viruses could stimulate the implanted T-cells to proliferate. In other words, they could push the cancer-fighting cells to multiply,” says Walsh. “Then we found that these viruses could also pull the cancer-fighting T-cells into the core of the tumour, which simply could not be done with ACT alone.”

In this study, the research group discovered that their ACT/OVV combination approach could engage the entire immune system to eliminate solid tumours and generate a long-term tumour-resisting effect in experimental animal models. Whereas current ACT can only kill specific tumour cells, their approach was effective at eliminating the various types of cells within solid tumours.

“Usually, ACT can only target the tumour cells that have a specific set of molecular markers. This is a problem because tumours can often shed these marked cells and return with a vengeance,” Walsh says. “Our approach engages the immune system as a whole, not just the re-engineered cells, to eliminate a broader variety of tumour cells and prevent the tumour from coming back over the long term.”

To bring this new approach into the next stage of development, the study group teamed up with experts across the province through OICR’s Immuno-oncology Translational Research Initiative. The team includes researchers with deep immuno-oncology expertise and extensive commercialization experience.

“Bringing this idea into the next stage of development requires collaboration across areas of expertise,” says Walsh, who holds a patent on the combination approach. “We’re looking forward to building on our past successes and using our collective expertise to move into more advanced animal models, and then onto clinical trials.”

August 16, 2018

Researchers find common cell process key to therapy resistance

Ottawa researchers discover a new way to make cancer cells more susceptible to virus-based therapies

Over the past decade, researchers have made significant progress in designing oncolytic viruses (OVs) – viruses that destroy cancer cells while leaving healthy tissue unharmed. However, some cancer cells are resistant to this type of therapy and their resistance mechanisms remain poorly understood.

Researchers at the The Ottawa Hospital and University of Ottawa, under the leadership of Dr. Carolina Ilkow, have discovered that a common cellular mechanism, RNAi, allows cancer cells to fight back against cancer-fighting viruses. Their findings, recently published in the Journal for Immunotherapy of Cancer, show that blocking RNAi processes in tumours can make cancer cells more susceptible to OVs.

Continue reading – Researchers find common cell process key to therapy resistance

May 17, 2018

Combination of erectile dysfunction drugs and flu vaccine may help kill remaining cancer after surgery

A flu vaccine sits on top of packages of erectile dysfunction drugs

A remarkable study led by Dr. Rebecca Auer from The Ottawa Hospital (TOH) shows that the unlikely combination of erectile dysfunction drugs and the flu vaccine may boost the immune system’s ability to clean up cancer cells left behind after surgery. This method demonstrated promising results in a mouse model, where it reduced the spread of cancer following surgery by 90 per cent. Now the approach will be tested in a first-of-its-kind clinical trial involving 24 patients at TOH.

Continue reading – Combination of erectile dysfunction drugs and flu vaccine may help kill remaining cancer after surgery

January 4, 2018

Study shows virus-boosted immunotherapy can be effective against aggressive breast cancer

The Maraba virus is seen under an electron microscope

Researchers at The Ottawa Hospital and the University of Ottawa have found that a combination of two immunotherapies – oncolytic viruses and checkpoint inhibitors – was successful in treating triple-negative breast cancer in mouse models. Triple-negative breast cancer is the most aggressive and hard-to-treat form of the disease.

Continue reading – Study shows virus-boosted immunotherapy can be effective against aggressive breast cancer

July 11, 2017

How OICR is helping to boost the body’s ability to fight cancer

Oncology Viruses - Image of a cell.

The body’s immune system is incredibly powerful. Its ability to detect and destroy various pathogens makes it central to maintaining good health. While we all know the role it plays in fighting the common cold or flu, many do not know that it has recently been enlisted by scientists in the fight against cancer. Researchers in a field known as immuno-oncology are working to find ways to turn on the body’s defences to locate and destroy tumour cells. OICR recently established a team of expert scientists and clinicians to develop and test new immunotherapies to help patients.

Continue reading – How OICR is helping to boost the body’s ability to fight cancer

May 25, 2017

OICR launches five all-star teams of Ontario scientists to tackle some of the deadliest forms of cancer

People from the press conference

Great strides have been made in cancer research, but much work remains to develop better treatments for the most lethal cancers and to advance new anti-cancer technologies. OICR is taking on a new approach, building on the success of the Institute’s first ten years and Ontario’s strength in particular cancer research areas. Reza Moridi, Ontario’s Minister of Research, Innovation and Science announced that the Institute is funding five collaborative, cross-disciplinary and inter-institutional Translational Research Initiatives (TRIs) with a total of $24 million over the next two years.

The TRIs will bring together some of the top cancer researchers in Ontario and be led by internationally renowned Ontario scientists. Each team will focus on a certain type of cancer or therapeutic technology. To maximize the positive impact of research on patients, the TRIs all incorporate clinical trials into their design. The TRIs, which were selected by an International Scientific Review Panel, are:

The funding will also support Early Prostate Cancer Developmental Projects led by Drs. Paul Boutros and George Rodriguez.

“In just over 10 years, the Ontario Institute for Cancer Research has become a global centre of excellence that is moving the province to the forefront of discovery and innovation in cancer research. It is home to outstanding Ontario scientists, who are working together to ease the burden of cancer in our province and around the world,” said Moridi.

“Collaboration and translational research are key to seeing that the innovative technologies being developed in Ontario reach the clinic and help patients,” said Mr. Peter Goodhand, President of OICR. “These TRIs represent a unique and significant opportunity to impact clinical cancer care in the province.”

Read the news release: OICR launches five large-scale Ontario research initiatives to combat some of the most deadly cancers

May 25, 2017

OICR launches five large-scale Ontario research initiatives to combat some of the most deadly cancers

Minister for Research, Innovation and Science

Toronto (May 25, 2017) – Reza Moridi, Ontario’s Minister of Research, Innovation and Science, today announced the Ontario Institute for Cancer Research is launching five unique, cross-disciplinary, multi-institutional Translational Research Initiatives (TRIs), each focused on a single type of or treatment approach to cancer. With $24 million in funding over two years, the TRIs will bring together world-leading scientists to tackle some of the most difficult to treat cancers and test innovative solutions to some of the most serious challenges in cancer today.

The TRIs build on Ontario’s proven strengths in areas such as stem cells, immuno-oncology, pediatric cancers, genomics, clinical trials and informatics. Working together, the province’s top scientists and clinicians will accelerate the development of much needed solutions for patients around the globe, with a focus on acute leukemia and brain, ovarian and pancreatic cancers. Each TRI includes clinical trials to maximize patient impact.

Continue reading – OICR launches five large-scale Ontario research initiatives to combat some of the most deadly cancers