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How to determine prostate cancer recurrence 
Know the risk factors for prostate cancer recurrence. 
One factor is whether there was cancer in the lymph nodes at the time of the initial diagnosis. Cancers that spread to the lymph nodes around the pelvic region increase the risk for a recurrence of prostate cancer later on.
Ask about the size of your initial tumor. As a general rule, the larger the initial tumor, the greater the risk of a recurrence.