GPT and esophageal cancer: In the first tPDT for esophageal cancer, esophageal pain, fever, esophageal stenosis, skin photosensitivity, increased AST, increased ALT, and increased blood bilirubin levels were reported in 53.8%, 30.8%, 7.7%, 0%, 19.2%, 19.2%, and 7.7% of patients, respectively [14].