KLK3 and prostate cancer: Abbreviations: 18F = fluorine, 18F-FDG = 18F-fluorodeoxyglucose, 68Ga = gallium 68, CI = confidence interval, HCC = hepatocellular carcinoma, PC = prostate cancer, PET/CT = positron emission tomography/computed tomography, PSMA = prostate-specific membrane antigen, PSA = prostate-specific antigen, SUVmax = maximum standardized uptake value.