• Experimental mammary carcinogenesis is advanced through chemical induction and host-tissue context studies, revealing how methylcholanthrene-induced carcinomas and transplanted normal tissue modulate tumor initiation, growth, and distribution in mice and rats [4], [7], [9], [13], [14], [19].

• Endocrine and hormonal regulation emerges as a central driver of breast cancer risk and therapy responses, with estrogens, menopausal status, and endocrine interventions shaping tumor incidence and pathology across models [8], [11], [12], [15], [18].

• Milk-related factors and maternal biology modulate mammary cancer development, as the literature links breastfeeding, milk influence, mastitis, and dairy-derived processing to tumor incidence and pathology in animal models [5], [10], [16], [20].

• Genetic background and host-tissue interactions drive mammary tumor susceptibility, demonstrated by strain-specific incidence, tumor ratios, and transplantation experiments across C57 and A-stock mice [7], [9], [14], [19].