Voriconazole exposure and geographic location are independent risk factors for squamous cell carcinoma of the skin among lung transplant recipients

Abstract

Skin cancer, in particular squamous cell carcinoma (SCC), is the most common malignancy after solid-organ transplantation. SCC has been reported in immunosuppressed patients receiving voriconazole, but the agent has not been shown to be a risk factor. Universal voriconazole prophylaxis and alemtuzumab induction are standard in our lung transplant program. We performed a retrospective, case-control study (matched 1:3) among lung transplant recipients at our center from 2003 to 2008. SCC was diagnosed in 3.1% (17 of 543) of patients at a median follow-up of 36 months. Median time to development of SCC was 19 months post-transplant. Risk factors for SCC by univariate analysis included older age (p = 0.02), residence in locations with high levels of sun exposure (p = 0.0001), single-lung transplant (p = 0.02) and duration (p = 0.03) and cumulative dose (p = 0.03) of voriconazole. Duration of voriconazole (hazard ratio [HR] = 2.1; p = 0.04) and residence in locations with high sun exposure (HR = 3.8; p = 0.0004) were independent risk factors by multivariate analysis. SCC lesions were located on the head and neck in 94% of cases, and 53% had multiple lesions. All patients were treated with surgery. At least one independent lesion developed subsequently in 47% of patients. Local spread and distant metastases each occurred in 7% of cases. There were no deaths among the cases. Voriconazole exposure is a risk factor for SCC after lung transplantation, particularly among older patients living in areas with high sun exposure. Voriconazole should be used cautiously in these patients.