[Nuclear magnetic resonance investigations of DMBA-induced rat breast cancers--the relationship between tumor doubling times and water proton spin-lattice relaxation times].

Our studies of human neoplastic tissues had revealed that the T1 values of many malignant tissues had a tendency to be longer than those of normal ones. But the T1 values did not always reflect the grade of malignancy on account of the variety of their histologies. Therefore, by using DMBA-induced rat breast cancer, we investigated the relation between the degree of malignancy and the T1 values, and the following results were obtained. 1) The growth rate of the cancers had a correlation with their T1 values, and 2) the water content of the cancers correlated with their T1 values, but 3) there was no correlation between their growth rate and their water content.