RESUMO
Paraffin blocks from 60 patients with prostate cancer were used to study the DNA ploidy patterns by flow cytometry. Nineteen patients had stage A disease, 11 had stage B, 9 had stage C, 20 had stage D, and 1 was of unknown stage. Histologically, 32 of the cancers were well differentiated, 21 were moderately differentiated, and 7 were poorly differentiated. Eighteen patients had an aneuploid or tetraploid (A/T) pattern and 42 had a diploid pattern. Seventy-one percent (5/7) of patients with poorly differentiated, 48% (10/21) with moderately differentiated, and 9% (3/32) with well-differentiated histology had A/T patterns (P < 0.01). Forty-five percent (9/20) of patients with stage D, 44% (4/9) with stage C, 27% (3/11) with stage B, and 5% (1/19) with stage A had A/T patterns (P < 0.05). Nine patients with an A/T pattern also had DNA ploidy studies done on the "benign" part of the specimen. These specimens showed diploid patterns although three of these patients had well-differentiated tumor in the "benign" designated part of the specimen. One patient with mixed histology had an aneuploid pattern on the poorly differentiated section and a diploid pattern on the well-differentiated section of the "malignant" designated part of the same specimen. We conclude that prostate cancer patients with non-diploid tumors have more advanced disease and less differentiated tumors than patients with diploid tumors and that considerable histological and ploidy heterogeneity may be present in different parts of the same paraffin-embedded specimen.
