CPQ and cancer: Leucine aminopeptidase (LAP)is another aminopeptidase that holdspotential as a cancer-imaging biomarker, given that LAP activity hasbeen positively correlated to the progression of breast cancer andovarian cancer, among others.34 Therefore,chemical tools to determine LAP activity in living systems may provideclinicians with useful information to diagnose, treat, and managecancer patients more effectively.