When it comes to cancer it’s more likely to come in the form of mRNA vaccines. My understanding is that the silver lining of COVID is that because it radically accelerated the development of mRNA vaccines, it should be fairly inexpensive to modify them to vaccinate against cancer. My understanding is that you get cancer all the time, it’s just that your body normally identifies it as a problem and attacks the cells; in fact, there are some people who may have an immunity to cancer as they’ve been observed healing from tumors without outside help. The cancers that people die from are ones that our bodies don’t recognize as a threat until it’s too late. Supposedly mRNA vaccines could be used to teach the body that it should target certain cancerous cells which it has no prior defense against.