Rhonda;
All you can do is cross the T's and dot the I's. You have accomplished that, if a recurrence develops it simply happens, but it doesn't happen because something was done or not done in the initial approach to treatment.
Your husband is correct, you may be CANCER free, but you are never free from CANCER.
As a rule, seven year survivors are considered cured. But honestly, there is no cure, you are in remission from disease.
Darrell