Prevention of cutaneous phototoxicity in photodynamic therapy

Patrick W. McLear, Richard E. Hayden

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Photodynamic therapy using hematoporphyrin derivative (Hpd), or its semipurified form, dihematoporphyrin ether (DHE), in combination with light, has proven effective in the treatment of several types of neoplasms including squamous cell carcinoma. A major disadvantage of this therapy is the long-term retention of these drugs in skin, which may result in cutaneous phototoxicity for weeks after treatment. Singlet oxygen has been identified as the primary cytotoxic product in the reaction of Hpd and light in vitro. This study demonstrates the protective effect in vivo of the singlet oxygen scavengers 1,3 diphenylisobenzofuran and l-tryptophan on the skin of young rats exposed to light after receiving DHE.

Original languageEnglish (US)
Pages (from-to)92-98
Number of pages7
JournalAmerican Journal of Otolaryngology--Head and Neck Medicine and Surgery
Issue number2
StatePublished - 1989


  • photodynamic therapy
  • photoprotection
  • singlet oxygen

ASJC Scopus subject areas

  • Otorhinolaryngology


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