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HERO ID
30018
Reference Type
Technical Report
Subtype
EPA Report
Title
Assessment of thyroid follicular cell tumors
Author(s)
U.S. Environmental Protection Agency :: U.S. EPA
Year
1998
Publisher
U.S. Environmental Protection Agency, Risk Assessment Forum
Location
Washington, DC
Report Number
EPA/630/R-97/002
Page Numbers
1-51
Number of Pages
51
Language
English
URL
https://www.epa.gov/sites/production/files/2014-11/documents/thyroid.pdf
Abstract
EPA conducts risk assessments on chemicals for carcinogenicity under the guidance provided in its cancer risk assessment guidelines (U.S. EPA, 1986a; 1996). From time to time scientific developments prompt the Agency to reexamine procedures that are generally applied. That is the case with the review of some chemicals that have produced thyroid follicular cell tumors in experimental animals. The purpose of this document is to describe the procedures EPA will use to evaluate these tumors and the data that are needed to make these judgments.
The report presents science policy guidance that describes the procedures the Agency will use in the evaluation of potential human cancer hazard and dose-response assessments from chemicals that are animal thyroid carcinogens. The Forum Report describes when, under clearly specified conditions, chemical carcinogenesis in thyroid follicular cells can be analyzed as a nonlinear phenomenon, rather than assuming low dose linearity as EPA customarily does for carcinogenic compounds.
Four hypothetical case studies are summarized which illustrate how to evaluate toxicological data and make hazard and dose-response estimation choices. The procedures and considerations developed in the Forum Report embody current scientific knowledge of thyroid carcinogenesis and evolving science policy. Should significant new information become available, the Agency will update its guidance accordingly.
NTIS Number
PB98-133119
Tags
•
tert-Butanol
Cited in Document
Cited in Public Comment Draft – May 2016
Toxicological Review
•
ETBE
Supporting Studies
Sources of Mechanistic and Toxicokinetic Data
Other mechanistic studies
•
Hexabromocyclododecane (HBCD)
Guidance/contextual references added during assessment development
OPPT REs
•
OPPT_Cyclic Aliphatic Bromine Cluster (HBCD)_F. Human Health
Total – title/abstract screening
On topic
Peer review
Secondary source/ Review
Cited in IRIS document or IRIS HERO page
On topic - additional tags for titles/abstracts
Human hazard ID
PFAS
•
PFBA
Supplemental References
•
PFBS
•
PFHxS
•
Nanoscale Carbon
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