体外放疗是治疗局限性前列腺癌的主要手段之一，目前临床上普遍采用的是常规分割放疗，但有研究表明前列腺癌对超低分割放疗即立体定向放疗(SBRT)也具有高度敏感性，增加放疗剂量可以明显提高肿瘤局部控制率。根据目前的研究来看，在局限性前列腺癌放疗效果方面，SBRT的治疗效果不亚于常规分割放疗；在放射毒性方面，SBRT在治疗后较传统分割放疗近期毒性更明显，但远期毒性并无明显差异。SBRT能够为患者提供更多的方便，且医疗成本更低，有较大的临床应用前景。“,”External-beam radiotherapy is one of the principle treatment options for localized prostate cancer. Conventionally fractionated radiotherapy is widely used in clinical practice. Studies have shown that prostate cancer is highly sensitive to hypofractionated radiotherapy, also known as stereotactic body radiotherapy (SBRT), and increasing radiotherapy dose can significantly improve the local control rate of tumor. A number of recently completed researches have shown that SBRT is as effective as conventionally fractionated radiotherapy. In terms of radiation toxicity, the short-term toxicity of SBRT is more obvious than that of conventionally fractionated radiotherapy, but there is no significant difference in long-term toxicity. SBRT can provide more convenience for patients, and the medical cost is lower, so it has a great clinical application prospect.