癌症患者的总体生存率一直在提高。然而，不同社会经济地位的生存率的提高并不一致。因此，我们调查了癌症患者 5 年生存率 (5YSR) 的收入差异和时间趋势。本研究使用了 2002 年至 2018 年的国家癌症队列，该队列是通过联系韩国中央癌症登记处和国民健康保险建立的服务 (NHIS) 索赔数据库，用于计算韩国按收入水平划分的癌症生存率。生存数据从 2002 年开始提供，分析基于精算方法。我们比较了最早可用的 5 年（2002-2006 年）和最新可用的 5 年（2014-2018 年）的生存率，观察时间截至 2021 年 12 月 31 日。收入水平分为六类：医疗援助受益人和五种 NHIS 亚型根据保险费。不平等斜率指数（SII）和不平等相对指数分别用于衡量按收入划分的 5YSR 的绝对差异和相对差异。2002-2006 年和 2014-2018 年期间所有癌症的 5YSR 均有所改善。研究期间观察到肺癌、肝癌和胃癌的 5 年生存率 (5YSR) 显着提高。肺（17.5，95% CI 7.0-28.1）、肝（15.1，95% CI 10.9-19.2）、胃（13.9，95% CI 3.2-24.7）、结直肠（11.4， 95% CI 0.9-22.0) 和前列腺癌 (10.7, 95% CI 2.5-18.8) 癌症的发病率显着更高，这意味着随着收入水平的提高，生存率也更高。在研究期间，肺癌、肝癌和胃癌的 SII 有所增加，而甲状腺癌、乳腺癌、宫颈癌、前列腺癌和结直肠癌的 SII 有所下降。尽管从 2002 年到 2018 年，不同癌症类型和收入水平的 5YSR 都有显着改善，这种增长并未在不同收入水平之间均匀分布。我们的研究揭示了癌症患者生存率持续存在的收入差距，特别是肺癌和肝癌患者。

The overall survival rates among cancer patients have been improving. However, the increase in survival is not uniform across socioeconomic status. Thus, we investigated income disparities in the 5-year survival rate (5YSR) in cancer patients and the temporal trends.This study used a national cancer cohort from 2002 to 2018 that was established by linking the Korea Central Cancer Registry and the National Health Insurance Service (NHIS) claim database to calculate the cancer survival rate by income level in the Republic of Korea. Survival data were available from 2002 onward, and the analysis was based on the actuarial method. We compared the survival of the earliest available 5-year period of 2002-2006 and the latest available 5-year period of 2014-2018, observing until 31 December 2021. Income level was classified into six categories: Medical Aid beneficiaries and five NHIS subtypes according to insurance premium. The slope index of inequality (SII) and relative index of inequality were used to measure absolute and relative differences in 5YSR by income, respectively.The 5YSR between the 2002-2006 and 2014-2018 periods for all cancers improved. A significant improvement in 5-year survival rates (5YSR) over the study period was observed in lung, liver, and stomach cancer. The SII of survival rates for lung (17.5, 95% confidence interval (CI) 7.0-28.1), liver (15.1, 95% CI 10.9-19.2), stomach (13.9, 95% CI 3.2-24.7), colorectal (11.4, 95% CI 0.9-22.0), and prostate (10.7, 95% CI 2.5-18.8) cancer was significantly higher, implying higher survival rates as income levels increased. The SII for lung, liver, and stomach cancer increased, while that of thyroid, breast, cervical, prostate, and colorectal cancer decreased over the study period.Although substantial improvement in the 5YSR was observed across cancer types and income levels from 2002 to 2018, this increase was not uniformly distributed across income levels. Our study revealed persistent income disparities in the survival of cancer patients, particularly for lung and liver cancer.