Characteristics and risk differences of different tumor size on localized prostate cancer: A retrospective cohort study in the SEER database.

In localized PCa, tumor sizes ≥21 mm may help predict low or intermediate-risk PCa, while tumor sizes ≤5 mm might help predict high-risk PCa. In clinical practice, we should be on high alert for patients with tumors size ≤5 mm due to its poor prognosis after RP.