Fig. 2. Clinical progression-free survival curves adjusted for propensity score with inverse probability weights in 158 patients given general anesthesia with ketorolac-morphine analgesia (general anesthesia/intravenous [i.v.] analgesia) and in 103 patients given combined general anesthesia and thoracic epidural analgesia (general anesthesia/thoracic epidural analgesia [TEA]) (P = 0.002).