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Clinical outcomes following IMRT and PBSPT after propensity score-adjusted analysis: LRC after PSM (A); OS after PSM (B); LRC after IPTW (C); OS after IPTW (D). Abbreviations: IMRT, intensity-modulated radiation therapy; PBSPT, pencil beam scanning proton therapy; LRC, locoregional control; OS, overall survival; PSM, propensity score matching; IPTW, inverse probability of treatment weighting.
