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Tumor deoxyribonucleic acid (DNA) content was analyzed by flow cytometry in 60 consecutive patients with stage I renal cell carcinoma. Of 59 evaluable tumors 27 (46%) were homogeneously diploid, 1 (2%) was tetraploid and 31 (52%) were aneuploid. Of the 32 nondiploid tumors 25 were heterogeneous concerning ploidy. One of the 27 patients with diploid tumors had metastases compared to 5 of the 32 patients with nondiploid tumors (not significant). There was a significant difference in survival between patients with diploid and nondiploid tumors (p = 0.043). Neither nuclear grade, tumor cell type nor tumor size correlated with survival. Analysis of DNA content seems to predict survival significantly for patients with stage I renal cell carcinoma.
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