Topical (4 percent) formalin is safe and effective in treatment of radiation-induced hemorrhagic proctitis. A single treatment will stop bleeding in 75 percent of patients.
The THE and AOE approaches have fewer early complications than does TTE. Both THE and TTE have equal long-term survival rates. Adjuvant therapy provides increased survival to node-positive patients with carcinoma of the esophagus and/or cardia.
Instillation of 4 percent formalin in sequential aliquots of a small volume that is kept in contact for a short period of time is safe. Serum formalin levels generally do not reach toxic levels, and the slight elevation in formalin concentration that was seen returns to normal within three hours. Formalin-induced proctitis heals within two weeks, and no long-term changes in rectal compliance or collagen content were seen.
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