Letter to the Editor

Abel, E. A. 1989. Cutaneous manifestations of immunosuppression in organ transplant recipients. J. Am. Acad. Dermatol. 21 (2 part 1): 167–179.

Anderson, R. R. , and J. A. Parrish . 1981. The optics of human skin. J. Invest. Dermatol. 77:13–19.

Bulera, S. J. , J. C. Theiss , T. A. Festerling , and F. A. de la Iglesia . 1999. In vitro photogenotoxic activity of clinafloxacin: a paradigm predicting photo-carcinogenicity. Toxicol. Appl. Pharmacol. 156:222–230.

Cosmetic Ingredient Review (CIR). 1997. Safety assessment of Glycolic Acid, Ammonium, Calcium, Potassium, and Sodium, Glycolate, Methyl, Ethyl, Propyl, and Butyl Glycolate, and Lactic Acid, Ammonium, Calcium, Potassium, Sodium, and TEA-Lactate, Methyl, Ethyl, Isopropyl, and Butyl Lactate, and Lauryl, Myristyl, and Cetyl Lactate. Final Report of the Cosmetic Ingredient Review Expert Panel, June 6, 1997.

Gibbs, N. K. , A. R. Young , and I. A. Magnus . 1985. Failure of UVR dose reciprocity for skin tumorigenesis in hairless mice treated with 8-methoxypsoralen. Photochem. Photobiol. 42:39–42.

IARC, Solar and Ultraviolet Radiation. 1992. IARC monographs on the evaluation of carcinogenic risk to humans, vol. 55. Geneva: IARC, WHO.

ICCVAM. 1997. Validation and regulatory acceptance of toxicologic test methods. NIH Publication No. 97–3981.

Müller, L. , and P. Kasper . 1998. The relevance of photomutagenicity testing as a predictor photocarcinogenicity. Int. J. Toxicol. 17:551–558.

Nakagawa, Y. , S. Wakuri , K. Sakamoto , and N. Tanaka . 1997. The photogenotoxicity of titanium dioxide particles. Mutat. Res. 394(1–3):125–132.

Pathak, M. A. , and T. B. Fitzpatrick . 1974. In Sunlight and man, ed. T. B. Fitzpatrick, 725–750. Tokyo: U. of Tokyo Press. Cited in Diffey, B. L. 1983. Phys. Med. Biol. 28:647–657.

Penn, I. 1988. Tumors of the immune compromised patient. Ann. Rev. Med. 39: 63–73.

Serup, J. , A. Winther , and C. Blichmann . 1989. A simple method for the study of scale pattern and effects of a moisterizer—qualitative and quantitative evaluation by D-Squame tape compared with parameters of epidermal hydration. Clin. Experiment. Dermatol. 14:211–282.

Warner, W. G. , J. J. Yin , and R. R. Wei . 1997. Oxidative damage to nucleic acids photosensitized by titanium dioxide. Free Radic. Biol. Med. 23:851–858.