BJT DC Leakage (ICES) dependency with Vce
The reverse leakage current is fairly constant so there is no extrapolation with Vce above 5V but increases with Ic(max) current rating of device , temperature ( e.g. x10 with 30'C rise )

If you read about basic diode and transistor theory, it explains why. For more info

So your challenge is to consider all the factors in making a selection for low leakage. 

When Vbe=0 and Vce= is large, Vbc is a reversed diode, which affects leakage current..