I asked to the Oncologist of my hospital when I started to bind, he said that binding doesn't increase at all the cancer risk.
He of course advised to bind only with proper binders (no tape, bandages...) not too tight, and never when sleeping or for too many hours but for other health problems (fluid in lungs, ribs etc.) nothing cancer related.
If you think of it, it's like when you sleep. Moobs get squashed for hours by your body weight against the mattress, in a proper binder they have much less pressure.