Hi Leigh,
Uhm...there is no stage 5, cancer is staged from I-IV. There are different stagings used depending on what type cancer it is. For example, breast cancer will stage a woman at II even with (minumal) nodal spread. Bladder cancer is much stricter and stages a person at IV with any nodal spread, even a single node that's been removed. But that doesn't portend a death sentence, although it could if a person had not received treatment.
Your doctor said you have no metastasis, meaning distant mets which would be stage IV big time. He used the word regional, and it's true, the spread was minimal, to regional nodes and they were removed. This whole situation is much more treatable than if it were distant nodes, or a vital organ. You've done every treatment called for in this situation, are in good health and have the odds in your favor.
5 yrs 20 percent may not sound great...but all things are relative once cancer has been diagnosed and these stats, though not perfect, could be much much worse. There's a saying that "2 will get you 5", and "5 will get you 10" and so on. It's the truth..the longer we survive, the longer we survive.
Take care,
wendy