- IRIS Summary (PDF) (15 pp, 125 K)
- Status: Isophorone is not being reassessed by IRIS at this time.
Health Hazard Assessments for Effects Other than Cancer
Reference Dose for Oral Exposure (RfD) (PDF) (15 pp, 125 K)
last updated: 09/01/1989
Reference Concentration for Inhalation Exposure (RfC) (PDF) (15 pp, 125 K)
last updated: 03/01/1991
Information reviewed but value not estimated.
Weight of Evidence for Cancer (PDF) (15 pp, 125 K)
last updated: 10/01/1992
|WOE Characterization||Framework for WOE Characterization|
|C (Possible human carcinogen)||Guidelines for Carcinogen Risk Assessment (US EPA, 1986)|
- Based on no data in humans; limited evidence of carcinogenicity of one tumor type in one sex of one animal species as shown by an increase of preputial gland carcinomas in male rats. The apparent renal tubular cell tumor in the male rat is associated with alpha-2u-globulin, considered to be of questionable relevance to humans.
- This may be a synopsis of the full weight-of-evidence narrative.
Oral Slope Factor:
9.5 x10 -4 per mg/kg-day
Drinking Water Unit Risk: 2.7 x10 -8 per µg/L
Extrapolation Method: Linearized multistage procedure, extra risk
Tumor site(s): Reproductive
Tumor type(s): Preputial gland carcinoma (NTP, 1986)
Not Assessed under the IRIS Program.
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