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Annual early gastric cancer/advanced gastric cancer ratio in National Cancer Screening Program and opportunistic screening. The proportion of early gastric cancers (EGCs) among a total of 126 gastric cancers was 69.8%. The EGC/advanced gastric cancer (AGC) ratio in National Cancer Screening Program (NCSP) was 2.9, while the EGC/AGC ratio in opportunistic screening (OS) was 1.2. The detection rate of EGC in NCSP was significantly higher than that in OS (P = 0.046).
