在癌症临床研究中病例随访尤为重要。癌症疗效评价的最终标准是治疗后病人的生存是否延长。这就需对病人进行随访,以记录生存时间。病例随访工作存在着一系列固有问题,随访起点和终点的选择因病种、疗法和研究目的而异。迄今多以诊断为起点以死亡为终点,其间等待时间或生存时间。随访有住院、门诊、通信、电话、家访等方式。失访原因不明,或为迁徙、退出等。退出可能归因于治疗,或因癌 Case follow-up is particularly important in cancer clinical studies. The ultimate criterion for evaluating the efficacy of cancer is whether the patient’s survival is prolonged after treatment. This requires follow-up of patients to record the survival time. There is a series of inherent problems in case follow-up work, and the choice of follow-up start and end points varies according to the type of disease, the therapy, and the purpose of the study. To date, the diagnosis has been used as the starting point and death as the end point, during which the waiting time or the survival time. Follow-up visits include inpatient, outpatient, communication, telephone and home visits. The reason for the loss of the follow-up is unknown, or for migration, exit, etc. Exit may be attributed to treatment or due to cancer