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A comparative flow-cytometric and image-cytometric study was performed on 166 human breast cancers. Parallel measurements of 67 cases showed a good correlation between the DNA indices measured with each of the techniques. However, minor ploidy abnormalities were detected with flow cytometry. Only with this technique about 70% of the tumors appeared to be aneuploid. DNA profiles obtained with image cytometry frequently contained DNA values above the modal G2 value of the tumor. At least part of these broadly scattered DNA profiles resulted from multiploid tumors, as was found with flow cytometry. The mean percentage of cells with DNA contents exceeding the modal G0G1 value in image-cytometric DNA profiles (non- G0G1 cells) appeared to be highest in aneuploid lymph-node-positive (N+) tumors and lowest in near-diploid lymph-node-negative (N-) tumors. Near-diploid tumors were more frequently (70%) estrogen receptor positive (ER+) than were aneuploid tumors (50%), whereas highly aneuploid tumors with low or negative ER contents tended to be N+. Tumors with a high percentage of non- G0G1 cells value were predominantly estrogen-receptor negative (ER-).
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