Abstract

Longitudinal testing of C3H/HeJ female mice was carried out over a 52-week period with the leukocyte adherence inhibition (LAI) assay using solubilized tumor antigen prepared by 3 M KCl extraction. During this period, 75% of the mice developed histologically confirmed mammary adenocarcinomas. Of those mice 93% had a statistically significant P < 0.01) LAI response to soluble mammary tumor antigen prior to first detection of tumors by palpation. Five percent of the test group developed statistically significant LAI responses without development of detectable mammary tumors within a 34-week observation period. The first significant LAI reactivity of individual mice preceded the first detection of tumors by an average of more than 17 weeks.

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