Hi Dave,
Yes they do but remember the older you get the more the odds go up - life IS a terminal illness.

Recurrence is the bane of this disease. That's why constant monitoring is critical. There are many factors that contribute to a poor survival rate: Late diagnosis, poor health habits, age, even race (African Americans have a higher death rate than Caucasions), among others. Poor tolerance to treatment, having to stop and restart treatment, multiple tumor sites or metastesis are all factors my oncologist told me about that have an influence on the survival rate.

I believe that the numbers level off in the 5th year. I haven't seen any data to imply that the 10 year survival rate is only 20%. I don't believe it's a linear curve. I have met people with 9 or more years of survival (even my own mother) and I aspire to be one of them.

Dump the numbers - they'll just make you crazy and give you fuel for a pity party.