Fig. 2From: Dosimetric rationale and preliminary experience in proton plus carbon-ion radiotherapy for esophageal carcinoma: a retrospective analysisSurvival probabilities of esophageal cancer patients after proton and carbon-ion radiotherapy. (Groups 1, 2, 3, and 4 delegate Overall survival, Progression free survival, Locoregional progression free survival, and Distant metastasis free survival.)Back to article page