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Relapse-free survival (RFS) curves for prognostic factors, considering the revised maximum standardized uptake value (SUVmax) and nuclear grade. The RFS of the revised SUVmax ≤ 6.0 group was significantly better than that of the revised SUVmax > 6.0 group in the log-rank test (p = 0.004). There was no significant difference in RFS between the nuclear grades (nuclear grades I/and II versus grade III) in the log-rank test (p = 0.120)
