Piflufolastat F18 injection is indicated for positron emission tomography (PET) of prostate-specific membrane antigen (PSMA)-positive lesions in men with prostate cancer with suspected metastasis who are candidates for initial definitive therapy, or with suspected recurrence based on elevated serum prostate-specific antigen (PSA) levels [45,46]. The gene discussed is KLK3; the disease is prostate carcinoma.