TEMOPORFIN IS A PORPHYRIN DERIVATIVE. IT IS USED PALLIATIVELY AS A PHOTOSENSITISER IN THE PHOTODYNAMIC THERAPY OF REFRACTORY SQUAMOUS CELL CARCINOMA OF THE HEAD AND NECK , THAT CANNOT BE TREATED WITH RADIOTHERAPY, SURGERY, OR SYSTEMIC CHEMOTHERAPY. IT IS ALSO UNDER INVESTIGATION IN THE TREATMENT OF VARIOUS OTHER MALIGNANT NEOPLASMS.