Study of Photodynamic Therapy (PDT) Using HPPH in Barrett's Esophagus

Inclusion Criteria: * Patient must have biopsy proven high-grade (severe) dysplasia, carcinoma-in-situ or early stage adenocarcinoma; * Patient may have received prior therapy; e.g. Nd-YAG laser, radiation therapy or chemotherapy. At least one month must have elapsed between prior treatments and PDT. * Tumors can be primary or recurrent, Stage 0 or I, N0M (any). * Patients must have no contraindications to endoscopy. * Male or female patients must be 18 years old or older. Female patients must not be pregnant and must be practicing a medically acceptable form of birth control or be sterile or post-menopausal. A pregnancy test is required and must be negative. * Patients must sign an Informed Consent according to FDA guidelines and be acceptable to the RPCI IRB. * Patients must have a Karnofsky status 50 or above. * Operable patients are not excluded. Exclusion Criteria: * Patients with tumors of grade greater than T-1. * Porphyria or hypersensitivity to porphyrin or porphyrin-like compounds. * WBC \<2,000; platelet count \<50,000, prothrombin time 1.5 times above the upper normal limit. * Patients with impaired renal and/or hepatic function (total serum bilirubin \>3.0 mg/d, serum creatinine \>3 mg%, alkaline phosphatase (hepatic) or SGOT \>3 times the upper normal limit. * Patients on concurrent chemotherapy or radiation therapy will be excluded as well as those having received prior treatment for the esophageal cancer within 4 weeks of enrollment. * If the patient has cancer other than non-melanoma skin cancer they must be deemed disease free by their treating physician.