Table 2. Common spontaneous mouse breast tumors.

Strain	Latency	Frequency	Pathology	References
AC: Adenocarcinoma; IDC: Invasive ductal carcinoma.
C3H	6–10 months	Breeding female mice: 95%; Virgin mice: 88%; Male mice: <1%	AC	Heston & Vlahakis, 1971; Machida et al., 2019
A		Breeding females: 80%–84%		Strong, 1936
DBA/2		Female mice: 72%; Virgin mice: 48%; Male mice: 1%		Szymanska et al., 2014
BALB/c	12 months	Female mice: 5%; Virgin mice: 1%	AC	Heston & Vlahakis, 1971; Machida et al., 2019
SHN	6.6–8.7 months	Breeding rats: 97.2%; Virgin rats: 88.3%	AC	Nagasawa et al., 1976
TA2	329.81±95.3 days	84.1%		Sun et al., 2008
Kunming	13.5 months	25%	IDC	Zheng et al., 2014