Mrna cure for cancer
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Not a requirement for being a vaccine. All the toxoid vaccines are to build immune response against a toxin secreted by bacteria. Tetanus and diphtheria come to mind.
Fair enough. But cancer isn't a bacteria either.
The issue is that the concept of a vaccine doesn't really apply to cancers (with the exception of what someone else laid out with Grok in this thread), and we know that's not what the Leftist was saying. He was asserting that vaccines cure diseases, rather than inoculate people from them.
I'm no expert, but the key issue with cancers is that the body can't recognize them as a threat because the cells are its own. In theory, if there were some material that could train the immune system to recognize the existing cancer cells, it would fit the definition of a therapeutic vaccine.
I agree with you that an mRNA treatment isn't a vaccine, it's gene therapy. But on paper, a cancer "cure" using a traditional vaccine mechanism could exist. You'd need to come with some antigen that got it to go after the cancer.