some may not like it but the mRNA approach to covid vaccine is applicable.

an mRNA that expresses antigens that are high signal to the immune system, such as measles antigen, packed into a lipid micelle bearing recognition molecules, specific to the immunoscape, of the tumor.

the bodys immune system would respond to tumour cells flagged with measles antigens, as if they were infected by measles, a robust response.

the concern is the extent of the tumor, and consequences for disruption of tissue or whole organ. not to mention the cost, for individual case vs participating in a research program.