Figure 2

Histological findings of prostate cancer. A, The tumor was composed of a poorly differentiated Gleason 4/5 adenocarcinoma (lower left of photograph) and an undifferentiated sarcomatoid carcinoma (upper right of photograph). B, The intraprostatic tumor showing a mixture of cribriform structures and necrosis. C, The tumor in the area of posterior invasion. Arrows indicate multinucleated giant cells. D, Cytokeratin AE1/3 immunostaining of the sarcomatoid carcinoma component.