Liu et al. (23) analyzed the added value of SB to TB from the PSA level and recommended a range of 10.0-20.0 ng/mL for combined SB and TB, while no differences were observed between SB and TB in cases with PSA >20.0 ng/mL and PSA < 10.0 ng/mL. The gene discussed is KLK3; the disease is tuberculosis.