68yr old man diabetic with kidney cancer wha is going to happen?

Hard to say. Sorry your friend is so sick! The prognosis for cancer depends on the type of the cancer, the stage it is at the time of diagnosis, the treatment (or not) that is used, and the overall health of the individual. Having diabetes complicates treatment more than if this was not present. Write down a list of questions to ask the doc. Write down the answers too, to be able to study later. Ask many!