In a new study from Stanford University, researchers advanced an old concept to develop a new strategy to train the immune system of mice to recognize cancer cells.
This work is based on the recent understanding that induced pluripotent stem cells (iPSCs), which are stem cells generated from skin or blood cells through a method called reprogramming, produce a large set of antigens that have overlap to a specific type of pancreatic cancer.
Vaccines can be highly effective in preventing infections by training the immune system to recognize agents foreign to the body, such as viruses, and to eliminate them.
Vaccines trigger the immune system by presenting so-called antigens, such as proteins not normally present in the body, which are then recognized as foreign by the immune system and therefore trigger an immune response.
Less known, and still in the early stages, are vaccines against cancer. Tumor cells often contain unique antigens that are rare or not found in other tissues of the body and, like antigens from a virus, can be targets for the immune system.
To date, it has been a challenge to develop an effective and durable (lasting) vaccine against tumors.
In this study, the researchers capitalized on the knowledge that iPSCs produce antigens that are also found on different types of tumors, but not present in most normal tissue.
They then vaccinated mice with the iPSCs that were treated with irradiation, so that they would not divide, and a CpG adjuvant to stimulate a robust immune response.
They hoped to train the mice’s immune systems to mount a response against the iPSCs, or any type of cell with a similar antigen makeup, including cancer cells.
The results of the study are insightful. The iPSC vaccination protected 75% of mice subsequently injected with pancreatic cancer cells from developing tumors.
Further, vaccination increased the number of tumor-targeting immune cells, and the vaccinated mice developed antibodies against the cancer cells.
What’s more, this strategy may also work for other cancer types with similar antigen makeup to iPSCs.
Further studies are required to show if iPSC cancer vaccines are safe and effective in patients, both in preventing tumor growth or re-growth and in eliminating established tumors.
If you care about pancreatic cancer, please read studies about a new way to starve pancreatic cancer and findings of new therapy may trigger self-destruction of pancreatic cancer.
For more information about pancreatic cancer treatment and prevention, please see recent studies about this heartburn drug linked to higher risk of pancreatic cancer and results showing that a new drug can treat pancreatic cancer.
The study is published in Stem Cell Reports. One author of the study is Joseph Wu.
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