Historical control data on prenatal developmental toxicity studies in rabbits.

Area of Science:

• Toxicology
• Reproductive Toxicology
• Developmental Toxicology

Background:

• Historical control data are crucial for interpreting findings in prenatal developmental toxicity studies.
• Standardization of data collection and reporting is essential for reliable comparative analyses.

Purpose of the Study:

• To consolidate and analyze historical control data from rabbit prenatal developmental toxicity studies conducted in Japan.
• To assess variability in maternal and fetal findings across different laboratories and rabbit strains.

Main Methods:

• Data were collected from 20 laboratories in Japan, focusing on studies conducted between 1994 and 2010.
• Laboratories with at least 10 studies were included, utilizing Japanese White and New Zealand White rabbits.
• Maternal reproductive parameters and fetal morphological alterations (external, visceral, skeletal) were analyzed.

Main Results:

• No significant differences were observed in maternal reproductive or fetal developmental data between rabbit strains or laboratories.
• Inter-laboratory variations in the incidence of fetal alterations were noted.
• These variations were attributed to differences in observation parameters, criteria, classification, and terminology.

Conclusions:

• Rabbit strains and laboratories showed comparable control data for prenatal developmental toxicity.
• Standardizing observation parameters, criteria, and terminology is recommended to reduce inter-laboratory variability in reporting fetal alterations.