Characterisation of the cutaneous pathology in non-small cell lung cancer (NSCLC) patients treated with the EGFR tyrosine kinase inhibitor erlotinib

European Journal of Cancer : Official Journal for European Organization for Research and Treatment of Cancer (EORTC) [and] European Association for Cancer Research (EACR)
Emma Guttman-YasskyJames G Krueger

Abstract

EGFR inhibitors (EGFRIs) have been shown to be clinically effective in various cancers. Unique skin toxicity is commonly observed with EGFRIs and a correlation between the clinical benefit of EGFRIs and this characteristic rash has been reported. Erlotinib is a potent EGFRI approved for treatment of non-small cell lung cancer (NSCLC) and pancreatic cancer. This is the first time in which patients were given increasing doses of an EGFRI to induce a mechanistic rash and study its associated pathology in skin. Biopsies were collected during treatment from both rash-affected and unaffected skin of 23 NSCLC patients and compared with pre-treatment biopsies. Altered differentiation of appendegeal epithelium (hair follicles and sebaceous glands) was remarkable in both affected and unaffected skin, although epidermal growth was not significantly reduced. A predominantly mononuclear leucocyte infiltrate was detected in the interfollicular dermis or around skin appendages. This infiltrate included TRAIL-positive cells with a dendritic cell (DC) morphology, although T-cells, antigen-presenting DCs and macrophages were also evident. This is the first report showing the involvement of a dendritic cell subtype with EGFRI skin toxicity. Alter...Continue Reading

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