Using best discriminative cut-off for the primary tumor SUVmax (4.6) to establish two groups based on ROC curve analysis, the high SUVmax (≧4.6) subgroup showed a shorter median PFS time than the low SUVmax (<4.6) subgroup, but the difference did not reach statistical significance (42.7 vs. 57.3 months; p = 0.66) ( Fig 1 ).
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