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Survival HRs and 95% CIs based on the three trials with quality scores of A+++ and A++. MF mitomycin C plus futraful, FT futraful, CQ carbazilquinone, MHCFU mitomycin C plus HCFU, MFU mitomycin C plus 5-fluorouracil, MT mitomycin C plus tegaful, T tegaful
