An innovative dual-action cell therapy engineered to eliminate tumors, train the immune system to eradicate primary tumors, and prevent cancer recurrence is progressing.
Cancer vaccines are an active area of research for many labs, but this new approach is distinct.
Scientists in Boston are now harnessing a new way to turn cancer cells into potent, anti-cancer agents.
In the latest work led by Khalid Shah, MS, Ph.D. at Brigham and Women's Hospital, investigators have developed a new cell therapy approach to eliminate established tumors and induce long-term immunity, training the immune system to prevent cancer from recurring.
The team recently announced their dual-action, cancer-killing vaccine candidate in an advanced mouse model of the deadly brain cancer glioblastoma, with promising results.
"Our team has pursued a simple idea: to take cancer cells and transform them into cancer killers and vaccines," said the study's corresponding author Khalid Shah, MS, Ph.D., director of the Center for Stem Cell and Translational Immunotherapy (CSTI) and the vice chair of research in the Department of Neurosurgery at the Brigham and faculty at Harvard Medical School and Harvard Stem Cell Institute (HSCI), in a press release on January 4, 2023.
"Using gene engineering, we are repurposing cancer cells to develop a therapeutic that kills tumor cells and stimulates the immune system to destroy primary tumors and prevent cancer."
Instead of using inactivated tumor cells, the team repurposes living tumor cells, which possess an unusual feature.
Like homing pigeons returning to roost, living tumor cells will travel long distances across the brain to return to the site of their fellow tumor cells. Taking advantage of this unique property, Shah's team engineered living tumor cells using the gene-editing tool CRISPR-Cas9 and repurposed them to release tumor cell-killing agents.
In addition, the engineered tumor cells were designed to express factors that would make them easy for the immune system to spot, tag, and remember, priming the immune system for a long-term anti-tumor response.
The team tested their repurposed CRISPR-enhanced and reverse-engineered therapeutic tumor cells (ThTC) in different mice strains.
Shah's team also built a two-layered safety switch into the cancer cell, which, when activated, eradicates ThTCs if needed.
This dual-action cell therapy was found safe, applicable, and efficacious in these models, suggesting a roadmap toward therapy.
While further testing and development are needed, Shah's team specifically chose this model and used human cells to smooth the path of translating their findings for patient settings.
"Throughout all of the work that we do in the Center, even when it is highly technical, we never lose sight of the patient," added Shah.
"Our goal is to take an innovative but translatable approach to develop a therapeutic, cancer-killing vaccine that ultimately will have a lasting impact in medicine."
Shah and colleagues note that this therapeutic strategy applies to a broader range of solid tumors and that further investigations of its applications are warranted.
The study's findings are published in Science Translational Medicine on Jan. 4, 2023. Disclosures: Shah owns equity in and is a member of the Board of Directors of AMASA Therapeutics, a company developing stem cell-based therapies for cancer. This work was supported by the U.S. NIH (grant R01-NS121096).














