A new study suggests that patients with prostate cancer who have low prostate antigen, or PSA, levels have a higher risk for cancer-specific death compared with patients whose PSA levels are high. A low PSA level was considered less than or equal to 2.5 ng/mL or 2.6 to 4 ng/m, while a high PSA level was considered 10.1 to 20 ng/mL The study was published online in the journal Cancer.