It sounds as if the patients you are getting definitely have some issues with control, hense the frequent calls for things they could probably do for themselves.
Another thing that may be occuring is what I call "displacement anxiety". Most oncology patients are in hospital on and off over a period of years. They usually spend time on the oncology ward and become familiar with the staff(so do their families). In our hospital, if they end up somewhere else until a bed is available, they can on occasion give the nurses a hard time. Some patients think that only the oncology nurses can look after them and distrust the nurses on a different ward. You may find it helpful to reassure them that your floor will do their best to look after them until a bed is available on the oncology ward. This sometimes stops the behavior you described. And it may not hurt to remind them that they are in a hospital bed receiving care. It may not be the place they want to be in hospital, but the alternative is a few days spent in a hallway in the ER.
Then again, it may not. Some patients and their families, irregardless of thier diagnosis, can be, if you pardon the term...a pain inthe a$$. These patients usually require some firm boundaries that are enforced by all the staff. This can be time consuming to set up but it does work. If you are finding that you are receiving alot of these off-service patients, it may not hurt to bring it up at a staff meeting to set up a protocol or strategy for your floor that deals with the more demanding patients. It does work if all the staff are consistent.