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Photosensitizing antihypertensive drug use and risk of cutaneous squamous cell carcinoma.
British Journal of Dermatology 2018 November
BACKGROUND: Many antihypertensive drugs (ADs) are photosensitizing, heightening reactivity of the skin to sunlight. Photosensitizing ADs have been associated with lip cancer, but whether they impact the risk of cutaneous squamous cell carcinoma (cSCC) is unknown.
OBJECTIVES: To examine the association between AD use and cSCC risk among a cohort of non-Hispanic white individuals with hypertension enrolled in a comprehensive integrated healthcare delivery system in northern California (n = 28 357).
METHODS: Electronic pharmacy data were used to determine exposure to ADs, which were classified as photosensitizing, nonphotosensitizing or unknown, based on published literature. We identified patients who developed a cSCC during follow-up (n = 3010). We used Cox modelling to estimate adjusted hazard ratios (aHRs) and 95% confidence intervals (CIs). Covariates included age, sex, smoking, comorbidities, history of cSCC and actinic keratosis, survey year, healthcare utilization, length of health plan membership and history of photosensitizing AD use.
RESULTS: Compared with nonuse of ADs, risk of cSCC was increased with ever having used photosensitizing ADs (aHR = 1·17, 95% CI 1·07-1·28) and ever having used ADs of unknown photosensitizing potential (aHR = 1·11, 95% CI 1·02-1·20), whereas no association was seen with ever having used nonphotosensitizing ADs (aHR = 0·99; 95% CI 0·91-1·07). Additionally, there was a modest increased risk with an increased number of prescriptions for photosensitizing ADs (aHR = 1·12, 95% CI 1·02-1·24; aHR = 1·19, 95% CI 1·06-1·34; aHR = 1·41, 95% CI 1·20-1·67 for one to seven, eight to 15 and ≥ 16 fills, respectively).
CONCLUSIONS: These findings provide moderate support for an increased cSCC risk among individuals treated with photosensitizing ADs.
OBJECTIVES: To examine the association between AD use and cSCC risk among a cohort of non-Hispanic white individuals with hypertension enrolled in a comprehensive integrated healthcare delivery system in northern California (n = 28 357).
METHODS: Electronic pharmacy data were used to determine exposure to ADs, which were classified as photosensitizing, nonphotosensitizing or unknown, based on published literature. We identified patients who developed a cSCC during follow-up (n = 3010). We used Cox modelling to estimate adjusted hazard ratios (aHRs) and 95% confidence intervals (CIs). Covariates included age, sex, smoking, comorbidities, history of cSCC and actinic keratosis, survey year, healthcare utilization, length of health plan membership and history of photosensitizing AD use.
RESULTS: Compared with nonuse of ADs, risk of cSCC was increased with ever having used photosensitizing ADs (aHR = 1·17, 95% CI 1·07-1·28) and ever having used ADs of unknown photosensitizing potential (aHR = 1·11, 95% CI 1·02-1·20), whereas no association was seen with ever having used nonphotosensitizing ADs (aHR = 0·99; 95% CI 0·91-1·07). Additionally, there was a modest increased risk with an increased number of prescriptions for photosensitizing ADs (aHR = 1·12, 95% CI 1·02-1·24; aHR = 1·19, 95% CI 1·06-1·34; aHR = 1·41, 95% CI 1·20-1·67 for one to seven, eight to 15 and ≥ 16 fills, respectively).
CONCLUSIONS: These findings provide moderate support for an increased cSCC risk among individuals treated with photosensitizing ADs.
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