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S, surgery; C, chemotherapy; R, radiotherapy. Among the six groups, p = 0.018; S vs. S+C, p = 0.155; S vs. S+R, p = 0.842; S vs. S+C+R, p = 0.155; S vs. C+R, p = 0.695; S vs. C, p = 0.064; S+C vs. S+R, p = 0.828; S+C vs. S+C+R, p = 0.483; S+C vs. C+R, p = 0.530; S+C vs. C, p<0.001; S+R vs. S+C+R, p = 0.434; S+R vs. C+R, p = 0.849; S+R vs. C, p = 0.061; S+C+R vs. C+R, p = 0.380; S+C+R vs. C, p = 0.010; C+R vs. CR, p = 0.013.
