BACKGROUND: We examined the relationship between voriconazole utilization and non-melanoma skin cancer (NMSC) development among adult lung and heart/lung transplant patients who were continuously enrolled in a large U.S. commercial health plan. METHODS: Cox proportional hazards regression models were constructed to assess both the crude and adjusted effect of voriconazole usage on NMSC development. Overall, 467 adult lung (98%) and heart/lung (2%) transplant patients (60% male) with median age of 58 years were analyzed. RESULTS: Fifty-seven (12%) patients developed NMSC over a median follow-up time of 610 days. At the crude level, patients with any (vs. none) claim for voriconazole were more likely to develop NMSC (19% vs. 12%, hazard ratio [HR]: 1.74, 95% confidence interval [CI]: 1.02, 2.96, P = 0.04). However, after statistical adjustment for demographic and clinical factors, the effect was largely diminished and no longer statistically significant (HR: 1.23, 95% CI: 0.71, 2.14, P = 0.45). Results were similar when modeling average and total dose of voriconazole. Risk factors significantly related to NMSC development were being male, older age, sun exposure, history of chronic obstructive pulmonary disorder, and history of immune disorder. CONCLUSION: Results suggest that the relationship between voriconazole utilization and NMSC among lung transplant patients may be a result of confounding by indication, and that controlling for underlying patient characteristics is paramount.
BACKGROUND: We examined the relationship between voriconazole utilization and non-melanoma skin cancer (NMSC) development among adult lung and heart/lung transplant patients who were continuously enrolled in a large U.S. commercial health plan. METHODS: Cox proportional hazards regression models were constructed to assess both the crude and adjusted effect of voriconazole usage on NMSC development. Overall, 467 adult lung (98%) and heart/lung (2%) transplant patients (60% male) with median age of 58 years were analyzed. RESULTS: Fifty-seven (12%) patients developed NMSC over a median follow-up time of 610 days. At the crude level, patients with any (vs. none) claim for voriconazole were more likely to develop NMSC (19% vs. 12%, hazard ratio [HR]: 1.74, 95% confidence interval [CI]: 1.02, 2.96, P = 0.04). However, after statistical adjustment for demographic and clinical factors, the effect was largely diminished and no longer statistically significant (HR: 1.23, 95% CI: 0.71, 2.14, P = 0.45). Results were similar when modeling average and total dose of voriconazole. Risk factors significantly related to NMSC development were being male, older age, sun exposure, history of chronic obstructive pulmonary disorder, and history of immune disorder. CONCLUSION: Results suggest that the relationship between voriconazole utilization and NMSC among lung transplant patients may be a result of confounding by indication, and that controlling for underlying patient characteristics is paramount.
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