<unk> s are chemicals designed to allow clinicians to determine whether a mass is benign or malignant and locate metastatic cancer sites in the body.
The development of an<unk>  involves synthesizing the<unk>  to target a particular tumor or process, after which the<unk>  instruments can be adjusted to neutralize the target. Such<unk> s are first examined via preclinical animal studies before engaging in early-phase human clinical studies.
Imaging agent
Radionuclide
Radiocontrast
Steroid
Antimicrobial
Analgesic
Antibiotic
Local anesthetic