Just so happens I read about a very successful trial of microscopic gold spheres that were too small to get caught in normal capillaries but would get caught in the capillaries that feed tumors.
Once the spheres had been deposited in the tumor the doctors would shoot the patients with radio waves that cause the gold spheres to heat up and literally cook the tumor.
The great part about this treatment is that it has no possible side effects because gold is totally non-toxic and after treatment the tumor is dead and would be absorbed by the body.
Unfortunately I have read nothing further about this research. This treatment should work against most cancers.
With larger tumors, necrosis setting in can put a patient into crisis, that’s another thing I recall from having my Lab treated. There’s such a thing as being too successful too quickly, in killing a tumor. Halt metastasis then reduce the mass at a rate the body can absorb, was the objective.