COVID-19 is an emerging, rapidly evolving situation.

Get the latest public health information from CDC and research information from NIH.

U.S. flag

An official website of the United States government

Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Share This:
Study Information
Study Attribute Value
CEBS Accession Number: 002-02165-0002-0000-8
Chemical Name: Ethylene thiourea (ETU)
CASRN: 96-45-7
NTP Study Type: Genetic Toxicology - Mammalian Cell Cytogenetics
NTP Study ID: 007998_CA
Study Result: Negative

Study Result: Negative
Activation Trial Trial Call
No Activation  1  Negative 
Induced Rat Liver S9  1_S9  Negative 

Trial #:1   Activation: No Activation    Date: 02/16/1983    Harvest Time: 22.7 hour(s)   Trial Call: Negative   
  Dose
µg/mL		 Total
Cells Examined		 Total Aberrations Complex Aberrations Simple Aberrations Other Abs
No. of
Abs		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs
Vehicle Control: Negative (Not Specified) 
0         
 100 6 0.060 6.0 1 0.010 1.0 5 0.050 5.0 0 0.000 0.0
Dimethyl Sulfoxide 
0         
 100 7 0.070 6.0 1 0.010 1.0 5 0.050 4.0 1 0.010 1.0
Test Chemical: Ethylene thiourea (ETU) 
6000         
 100 3 0.030 3.0 1 0.010 1.0 1 0.010 1.0 1 0.010 1.0 
7000         
 100 4 0.040 3.0 0 0.000 0.0 3 0.030 2.0 1 0.010 1.0 
8000         
 100 7 0.070 7.0 4 0.040 4.0 3 0.030 3.0 0 0.000 0.0 
9000         
 100 11 0.110 9.0 3 0.030 3.0 6 0.060 4.0 2 0.020 2.0
Positive Control: Mitomycin-C 
 0.05      
 50 49 0.980 50.0 25 0.500 40.0 24 0.480 28.0 0 0.000 0.0
Trend: 1.331 1.649 0.362  
Probability: 0.092 0.050 0.359  


Trial #:1_S9   Activation: Induced Rat Liver S9    Date: 02/23/1983    Harvest Time: 10.5 hour(s)   Trial Call: Negative   
  Dose
µg/mL		 Total
Cells Examined		 Total Aberrations Complex Aberrations Simple Aberrations Other Abs
No. of
Abs		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs
Vehicle Control: Negative (Not Specified) 
0         
 100 5 0.050 4.0 0 0.000 0.0 3 0.030 2.0 2 0.020 2.0
Dimethyl Sulfoxide 
0         
 100 4 0.040 4.0 1 0.010 1.0 1 0.010 1.0 2 0.020 2.0
Test Chemical: Ethylene thiourea (ETU) 
8000         
 100 5 0.050 5.0 2 0.020 2.0 1 0.010 1.0 2 0.020 2.0 
9000         
 100 8 0.080 7.0 1 0.010 1.0 4 0.040 4.0 3 0.030 3.0 
10000         
 100 8 0.080 8.0 4 0.040 4.0 3 0.030 3.0 1 0.010 1.0
Positive Control: Cyclophosphamide 
50         
 50 21 0.420 30.0 11 0.220 20.0 9 0.180 14.0 1 0.020 2.0
Trend: 1.321 1.253 1.378  
Probability: 0.093 0.105 0.084