We report here the development of an orthotopic-transplant model of hu
man patient breast cancer in nude mice. Histologically-intact patient
breast tumor tissue was transplanted as intact tissue to the mammary f
at pad of nude mice where the tumor tissue grew extensively and metast
asized to the lung. This is the first orthotopic-transplant metastatic
model of human breast cancer. The potential clinical and basic-scienc
e uses of the model are discussed.