We developed a new method to analyze simultaneously cellular prostate-specific antigen (PA) content and deoxyribonucleic acid (DNA) content of each prostatic epithelial cell by using flow cytometry (FCM). We report the possibilities of this method and we analyzed firstly 8 samples from 6 patients with benign prostatic hypertrophy (BPH). The content of cellular PA and DNA of prostatic epithelial cells can be analyzed simultaneously. The PA is synthesized only in the cells with a 2C DNA content (G0/1 cells) and not in the S- or G2M-phase cells. In the near future, by applying this analytical method to prostatic cancer samples we could obtain more interesting knowledge of the behavior of prostatic cancer.