1. This model provides prostates with tumors in 4 different development periods.
2. The 1st development: Benign, a little big but the prostates still works well.
3. The 2nd development: some hard tubers can be observed in the top right quadrant of prostate. It is the beginning of the tumors.
4. The 3rd development: The tumor is proliferating, and the previous tubers become bumps.
5. The 4th development: The prostates is all replaced by tumors, the surface become more rough harder than before.

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