THE PURPOSE OF THIS MODIFICATION IS TO PROVIDE A NO-COST EXTENSION TO EXTEND THE PERIOD OF PERFORMANCE.

国家癌症研究所（NCI）监测流行病学和最终结果（SEER） 计划是收集和报告与发病率有关的癌症统计数据的年度估计， 患病率和患者生存率;监测趋势，以确定癌症发病率的重要变化， 按地理、人口和社会特征定义的人口亚组;提供 关于诊断时疾病阶段和治疗类型随时间变化的信息，以及 癌症患者生存率的相关变化;开展专门研究， 癌症发病率、治疗模式和癌症控制的其他相关方面;并提供基础设施 来支持癌症研究。

The purpose of the National Cancer Institute (NCI) Surveillance Epidemiology and End Results (SEER) Program is to assemble and report annual estimates of cancer statistics that pertain to incidence, prevalence, and patient survival; monitor trends to identify important changes in cancer rates for population subgroups defined by geographic, demographic, and social characteristics; provide information on changes over time in stage of disease at diagnosis and types of therapy, as well as associated changes in cancer patient survival; carry out special studies that provide insight into trends in cancer rates, treatment patterns, and other relevant aspects of cancer control; and provide an infrastructure to support cancer research through its data.