Mammary Neoplasms, AnimalDog DiseasesDogsMammary Glands, AnimalMammary Tumor Virus, MouseAdenomaMammary Neoplasms, ExperimentalImmunohistochemistryCarcinomaGene Expression Regulation, NeoplasticAdenocarcinoma9,10-Dimethyl-1,2-benzanthraceneCell Line, TumorTumor BurdenTumor Markers, BiologicalMethylnitrosoureaTumor Necrosis Factor-alphaNeoplasms, ExperimentalMice, TransgenicMice, Inbred BALB CTumor Suppressor Protein p53Genes, Tumor SuppressorWilms TumorNeoplasm MetastasisBreast Neoplasms