[Experimental studies for photodynamic therapy of malignant tumors of the mouth cavity, larynx and pharynx with the photosensitizer methylene blue].

Squamous-cell carcinomas of the upper aerodigestive tract can be destroyed in vitro through photosensitization with Methylene blue and subsequent radiation with red laser light. It is impossible to obtain the same results with sensitization or light radiation alone. The paper discusses the conditions under which this procedure might develop into a truly selective photodynamic therapy method.