In terms of treatment, when the tumor is confined to the prostate, and hasn't metastasized, active surveillance is usually done.

治疗方法方面，当癌症局限于前列腺而未转移时，一般需要积极监测。

Treatment of precancerous lesions begins with active surveillance, removing any diseased tissue, and stopping any causative agents, like smoking and alcohol abuse.

癌前病变的治疗要从积极监测开始，任何病变组织都要被去除，还要停止接触一切致癌物，如戒烟戒酒。

Treatment may include chemotherapy, radiation therapy, surgery, and hormonal therapy, but active surveillance is also an option in many cases where it's localized to the prostate.

治疗方案包括化疗、放疗、手术和激素治疗，如果癌症局限于前列腺，对某些患者积极监测也是一种选择。