Prototype KG‑aware adaptation of the BioPortal interface. Graph pages generated from live KG‑Registry metadata; tool links go to the live BioPortal.
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CTO

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Clinical Trials Ontology

KGXBioPortal ontologyvVersion Release: 1.0.0CC BY 4.0
Visibility: Public

A KGX transformation of the BioPortal ontology Clinical Trials Ontology (CTO), produced by KG‑Bioportal. Nodes are ontology classes; edges are the relations between them.

Graph at a glance

447
Nodes
904
Edges
Version Release: 1.0.0
Version
2026-09-14
Transformed

Products & downloads

KGX
KGX nodes & edges
CTO.tar.gz
447 nodes · 904 edges
Base graph is the full graph

This ontology declares no imports, so its base graph already is its full graph; nothing separate was built.

The graph contains CTO_nodes.tsv and CTO_edges.tsv. Releases are incremental, so each link points at whichever release most recently rebuilt this ontology.

Biolink categories 8 categories across 447 nodes

NamedThing221
InformationContentEntity102
Procedure53
PhysicalEntity30
Attribute18
OrganismTaxon11
Activity7
Publication5

An item carrying more than one category is counted under each, so these counts can add up to more than the total.

How they were assigned 226 of 447 nodes (50.6%)

9is a seed term whose Biolink class is not in doubt
217inherits from a seed term above it in the hierarchy

Biolink categories 1 category across 904 edges

Association904

An item carrying more than one category is counted under each, so these counts can add up to more than the total.