Warty and clear-cell Bowen's disease successfully treated with photodynamic treatment.

Department of Dermatology, Gaziosmanpasa University School of Medicine, Tokat, Turkey.
Photodermatology Photoimmunology and Photomedicine (Impact Factor: 1.3). 02/2010; 26(1):48-50. DOI: 10.1111/j.1600-0781.2009.00482.x
Source: PubMed

ABSTRACT Clear cell Bowen's disease (BD) is a rare histopathological subtype of BD, characterized by epidermal atypical keratinocytes with clear-cell changes exceeding 80% of the tumor population. Warty and clear cell Bowen's disease (WCCBD) is a recently described variant of clear cell BD, with verrucous and hyperkeratotic surface changes in addition to pathological features consisting of an extremely acanthotic epidermis, hyperkeratosis and clear-cell changes. Herein we present a 72-year-old man with a 1-year history of tumoral lesion located on the left cheek with a diagnosis of WCCBD, in whom we achieved excellent result with photodynamic treatment. To the best of our knowledge, this is the second reported case of this entity.

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    ABSTRACT: Topical photodynamic therapy (PDT) is a well-established treatment modality which has mainly shown to be effective for dermatooncologic conditions like actinic keratoses (AK), Bowen's disease, in situ squamous cell carcinoma and superficial basal cell carcinoma (BCC). However, a therapeutical benefit of PDT is also evident for inflammatory dermatoses like localized scleroderma, acne vulgaris and granuloma annulare. Recent work has been focused on the development and evaluation of topical photosensitizers like the heme precursor 5-aminolevulinic acid (5-ALA) or its methyl ester (methyl aminolevulinate) inducing photosensitizing porphyrins. These drugs do not induce strong generalized cutaneous photosensitization like the systemically applied porphyrins or their derivatives. For dermatological purposes, incoherent lamps or light-emitting diode arrays can be used for light activation. Depending on the applied light dose and the concentration of the photosensitizer either cytotoxic effects resulting in tumor destruction or immunomodulatory effects improving the inflammatory conditions occur. Treating superficial oncologic lesions (tumor thickness <2-3 mm) cure rates achieved by PDT are equal to the cure rates of the respective standard therapeutic procedure. The benefits of PDT are the low level of invasiveness and the excellent cosmetic results after treatment.
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