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X-chromatin (Barr bodies) correlated with the DNA content of lobular neoplasia and invasive lobular carcinoma in the female breast.

Literature relating X-chromatin with the histologic grade in carcinoma of the breast is briefly reviewed. X-chromatin incidence has been determined in 14 cases of lobular neoplasia and 5 invasive lobular carcinomas of the breast and has been correlated with the DNA content in these sections examined by Feulgen microspectrophotometry. In 11 of the cases of lobular neoplasia, the DNA values fell within the diploid range and in the 3 remaining cases within the diploid to tetraploid range, while the 5 invasive lobular carconomas showed a DNA distribution between the diploid and tetraploid ranges. The X-chromatin counts of these cases were variable but did not correlate with the cytophotometrically observed degree of malignancy in lobular neoplasia. No statistically significant differences in X-chromatin count of lobular neoplasia and invasive lobular carcinoma could be seen.