The progression of prostate cancer varies greatly, and the progression of each stage of prostate cancer does not necessarily follow the sequence of stage I (A) to stage IV (D). Stage I cancers may remain in that stage for a long time, or they may change to stage III (C) or stage IV. The same is true for stage II (B) and stage III cancer progression. The progression of each stage of prostate cancer is as follows: Stage A1: The elderly may not be treated. The chance of developing distant metastasis is 8%, and the 10-year survival rate is 98%. Stage A2: 30% have distant metastasis and the 10-year survival rate is 80%. Stage B1: 30% metastases within 5 years, with a 5-year survival rate of 80%. Stage B2: 80% metastases within 5-10 years, with a 10-year survival rate of 30%. Stage C: 50% distant metastases within 5 years, with a 10-year survival rate of 25%. Stage D1: 85% distant metastases within 5 years, with a 5-year survival rate of 25%. Stage D2: 50% survival at 3 years, 20% survival at 5 years, 10% survival at 10 years