Given the task definition and input, reply with output. Convert a disfluent question to a proper question. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.

Tumors that are able to evade the body's cells, I mean immune response, can become what?

Tumors that are able to evade the body's immune response can become what?