Spread can be
Local, correlated with perineural invasion; or distant, correlated with gl score, invasion to semves, and high psa.
The prostate has a capsule, and I use the simple dcp or ece - (disease confined to prostate/extraprostatic extension). Growth rate is often measured by the rate that the psa doubles. Some cases are "watchable", others (psa >20; gl > 7) need treatment regardless.