title: Photodynamic therapy for tumors of the gastrointestinal tract.
authors.forename: R T
authors.initials: RT
authors.lastname: Zera
mesh_terms: D005500:Follow-Up Studies; D005770:Gastrointestinal Neoplasms / Q000188:drug therapy*; D006414:Hematoporphyrin Photoradiation; D006801:Humans; D010778:Photochemotherapy