Maguire H, Outzen H C, Custer R P, Prehn R T
J Natl Cancer Inst. 1976 Aug;57(2):439-42. doi: 10.1093/jnci/57.2.439.
When aliquots of a malignant hamster tumor were transplanted to nude mice and to hamsters, the tumor showed 1) more rapid growth in the hamster, 2) local invasion and metastasis in both species, and 3) occasional spontaneous regression in the nude mouse.