From: Dosimetric comparison between proton beam therapy and photon radiation therapy for locally advanced esophageal squamous cell carcinoma
Grade1
Grade2
Grade3
Grade4-5
Acute toxicity
 Pneumonitis
7 (26%)
0
 Pericardial effusion
–
1 (4%)
Late toxicity
17 (63%)
 Pleural effusion
5 (19%)
4 (15%)