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Endocrine Disruptor Knowledge Base (EDKB)

EDKB overview, access, citations, and contact information.

About EDKB

The Endocrine Disruptor Knowledge Base (EDKB) is intended to serve as a resource for research and regulatory scientists to access endocrine activity data and to foster the development of computational predictive toxicology models. It consists of the following resources:

  • a biological activity database
  • QSAR (Quantitative Structure-Activity Relationship) training sets
  • in vitro and in vivo experimental data for more than 3,000 chemicals
  • literature citations
  • chemical-structure search capabilities

What are Endocrine Disruptors?

Endocrine disruptors are chemicals that interfere with the endocrine systems, leading to adverse effects. Some chemicals do this by binding to receptors, such as the estrogen and androgen receptors.

EDKB Datasets

Among the data are two datasets intended for use in predictive model development. The datasets were derived from competitive binding assays for the estrogen and androgen receptors at NCTR. For both datasets, chemicals were selected to encompass a broad chemical-structure diversity as well as activity range.

Computer-Based Predictive Models

A major element of the EDKB program has been the development of computer-based predictive models to predict binding affinity of compounds to the estrogen and androgen receptors. EDKB models have been developed using both commercial and NCTR-developed SAR and QSAR methods. NCTR is currently developing other methods and models that will enable activity predictions solely based on chemical structure to be done online. Specifically, NCTR plans to provide online access to a model based on the Decision Forest classification method where the user is only required to input the structures of chemicals to be predicted.

To access the web-based EDKB, click here:



The EDKB: An Established Knowledge Base for Endocrine Disrupting Chemicals.
Ding D., Xu L., Fang H., Hong H., Perkins R., Harris S., Bearden E.D., Shi L., and Tong W.
BMC Bioinformatics. 2010, 11 Suppl 6:S5.

Contact Information

Please address any questions and suggestions to Dr. Weida Tong at 870-543-7142 or weida.tong@fda.hhs.gov.

EDKB is a product designed and produced by the National Center for Toxicological Research (NCTR).  FDA and NCTR retain ownership of this product.

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