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美国癌症学会估计1984年可发现870,000例新的侵润性癌、45,000例宫颈原位癌、5,000例女性乳腺癌以及400,000例非黑色素瘤皮肤癌,合计全年有132万新的癌症病人。按此估计,具有侵润性癌的71%限于局部区域,29%病人在发现时已有转移,局部侵润癌中的56%将可治愈,44%发展为复发癌。在美国,新发现的侵润癌病人中50-60%将接受放射治疗,其中包括治愈性、姑息性、或综合治疗中的一部分。大约175000病人因复发或未治愈而行放疗。因此,1984年大约615000例病人需要放疗做为治疗中的一部分,这个问题将随人口和平均年
The American Cancer Society estimates that 870,000 new cases of invasive cancer, 45,000 cases of cervical carcinoma in situ, 5,000 cases of female breast cancer, and 400,000 cases of non-melanoma skin cancer could be discovered in 1984, which together totaled 1.32 million new cancer patients throughout the year. According to this estimate, 71% of invasive cancers are localized, 29% of patients have metastasized at the time of discovery, 56% of locally invasive cancers will be cured, and 44% will develop recurrent cancers. In the United States, 50-60% of newly diagnosed invasive cancer patients will receive radiation therapy, including a portion of curative, palliative, or combination therapy. About 175,000 patients received radiotherapy due to relapse or no cure. As a result, approximately 615 000 patients needed radiotherapy as part of their treatment in 1984. This problem will vary with population and average years.