Environment and Breast Cancer: Science Review
Cancer studies: Experimental details
Steinhoff D, Mohr U. The question of carcinogenic effects of hydrazine. Exp Pathol 1988;33(3):133-43.
Route
Route of chemical administration: dermal, inhalation, gavage (delivery directly into the
stomach), in feed, subcutaneous injection (under the skin), or intraperitoneal injection (into the
cavity that contains the abdominal organs).
in water
Doses
Dosage, frequency, and duration of treatment; the sizes of the groups of animals
involved and what age the animals were at the beginning of the study.
0, 2, 10, 50 mg/l drinking water until spontaneous death.
Each dose group was comprised of 50 rats of each sex.
Time after cessation of dosing
How long the animals were observed after the chemical was no
longer being administered and before death of the animals.
none
Mammary tumors, malignant
Development of malignant mammary gland tumors follows the
same format as for benign, as described above.
2/50, 9/50, 2/50, 1/47
CPDB TD50 (mg/kg-d)
Data excerpted from the CPDB database that is defined as the "dose-rate in
mg/kg body wt/day which, if administered chronically for the standard lifespan of the species,
will halve the probability of remaining tumorless throughout that period". The CPDB
calculated values for all tumor endpoints listed as well as for total tumors. The range of
mammary gland tumors TD50s is provided, as well as an overall range.
Mammary: 1.13, Overall: 1.13-129