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were found to contain adenomas, adenoacanthomas, squamous-celled proliferations and foci of keratinised squamous epitheliosis similar to the hyperplastic nodules which have been described in outbred stock mice and in pure line strains both free of and infected with milk factor (reviewed by Huseby and Bittner, 1946). The purely acinar foci found in Rlllb females were shown to 'persist in the absence of milk factor in this cross-suckled substrain and in the absence of ovarian hormone. They were referred to as benign adenomas rather than nodular hyperplasias on account of their eventual independence of ovarian hormone. In addition some small invasive tumours were found by microscopic examination that appeared to represent intermediate stages in progression from benign to malignant growth (Pulhnger, 1952). Afitoses were found in both types of growth with the exception of the keratinised foci. All the morphological varieties persisted after ovariectomy in old animals. 'In order to'test the capacity of the benign growths for progression to malignancy, transplantation of as many as could be found in the fresh state was attempted. Grafts were transferred to young unmated females and to others of the same strain breeding rapidly. By this means the benign growths were given a longer life and increased hormonal stimulus. None of the grafted benign growths was promoted to malignant tumours.

Limited Power of Growth of Spontaneous Benign Mammary Tumours in RIIIb Mice