What happens to a tumor when it dies?

I'm getting mixed information about killing cancer cells vs reverting cancer cells back to normal. What is the difference here and what is the end result? It sounds like those are 2 different things, yet I'm also reading cancer cells are reverted back to normal cells after the microbes in those cells are killed which makes them sound like the same thing. I'm also reading some stories about cancer being cured but a dead shrunken tumor is left behind. Do tumors completely turn back into normal cells after the cancer causing microbes in those tumors die?