Health Statistics Division at Statistics Canada, Ottawa, Ontario K1A 0T6.
Health Rep. 2011 Jun;22(2):21-5.
Survival estimates measured from the time cancer diagnosis become less informative after one or two years' survival. Using records from the Canadian Cancer Registry linked to the Canadian Vital Statistics Death Database, five-year conditional relative survival ratio (RSR) estimates were derived for a large number of cancers. For each cancer with an initial five-year RSR of at least 80% (except breast cancer), a conditional five-year RSR of 95% or more was achieved after five years' survival. Among cancers with initial five-year RSRs of 50% to 79%, a five-year conditional RSR of 95% or more was observed for cancers of the cervix uteri and colon after five years. There was no apparent improvement in survival prospects during the first five years after diagnosis for chronic lymphocytic leukemia (CLL). Despite initial prognoses of less than 50%, a conditional five-year RSR of at least 90% five years after diagnosis was achieved for stomach cancer and leukemia (excluding CLL).
从癌症诊断后一到两年的生存数据来看，生存估计的信息价值就会降低。利用加拿大癌症登记处的记录与加拿大生命统计死亡数据库相链接，我们得出了大量癌症的五年条件相对生存率（RSR）估计值。对于初始五年 RSR 至少为 80%的每一种癌症（乳腺癌除外），在生存五年后，都能达到 95%或更高的条件五年 RSR。在初始五年 RSR 为 50%至 79%的癌症中，在生存五年后，子宫颈癌和结肠癌的五年条件 RSR 达到了 95%或更高。慢性淋巴细胞白血病（CLL）在诊断后五年内，生存前景似乎没有明显改善。尽管最初的预后不到 50%，但在诊断五年后，胃癌和白血病（不包括 CLL）的五年条件 RSR 至少达到了 90%。
