This model provides prostates with tumors in 4 different development periods.
The 1st development : Begin , Slightly enlarged, but normal prosmate gland simulates benign stage.
The 2nd development : Some hard tubers can be observed in the top right quadrant of prostate, It's the beginning of the tumor
The 3rd development : Prostate with easily palpable large mass simulate intermediate stage. The small module has increased is size and has become an external hard mass on the surface of the gland.
The 4th development : Prostate with malignant invasive cancer simulate terminal stage. This gland is totally replaced with carcinoma. The entire gland will feel gard and irregular.