Patients will be enrolled in the registry upon injection of the porfimer sodium. During normal medical examination, criteria for entry onto the registry will be verified to confirm eligibility, and medical procedures including demographic information, disease history, medical history, physical exam, and clinical laboratory testing performed under normal practice will be collected. Patients will receive PDT as per current practice and will be repeated as per the physician's judgment. All patients will be assessed as per current practice, that is usually at least three times, after a PDT session. Additional visits will be sought for those patients who are presenting photosensitivity reaction, esophageal stenosis, perforation at the site of laser light application, or any unresolved serious adverse reactions at the third visit after treatment. All patients will be requested by their physician to complete a two-part Daily Diary to record adverse reactions using a check-list form and a general section for reporting any adverse events and intake of concomitant medications at the time of the adverse event.