I remember reading Prey by Michael Crichton as a teenager and wondering if the nanobots he described there could be used to "eat" a tumor, like leaf-cutter ants

I remember reading Prey by Michael Crichton as a teenager and wondering if the nanobots he described there could be used to "eat" a tumor, like leaf-cutter ants gradually moving bits of material in a pipeline from one place to another. Glad to see that kind of idea realized in my lifetime.