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Eighty patients with prostate carcinoma underwent fine-needle aspiration biopsy for cytologic grading and DNA-single-cell fluorescence photometry before and at 6-month intervals after endocrine treatment. The histograms of DNA values showed single peaks and bimodal and scattered distributions which correlated to the different tumor grades before therapy. The DNA values were significantly different from the controls with benign prostatic hypertrophy. After start of therapy, regressive changes of the DNA-histograms were increases of diploid and hypodiploid DNA values and disappearance of secondary peaks. Progressive changes were increased scattering of DNA values and appearance of secondary peaks. Progressive changes in the histograms were closely related to clinical remission and stable disease, but related poorly to clinical progression. The survival correlated with the pretherapeutic DNA-histograms and with the DNA-median, third-quartile, and maximum parameters.
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