Head noun: prostate
Postmodifier: specific antigen

Same concepts
http://dbpedia.org/resource/Prostate-specific_antigen

Broader concepts

labelprovenanceconfidence
testisap:3845903790.542799
markerisap:4814968160.496813
proteaseisap:578061710.361049
proteinisap:3458504620.331343
test for prostate cancerisap:3845903820.325069

Narrower concepts

labelprovenanceconfidence