Sun protection and shade use

Suggested

3 studies · 1 recommendation

Last updated: February 25, 2026

Suggested3 studies

Regular sun protection and shade-seeking significantly reduce melanoma risk through lower UV exposure

Three studies encompassing over 700,000 participants establish a clear link between UV exposure reduction and melanoma prevention. A cohort study validated urinary thymine dimers as a UV biomarker, confirming that dose-limiting measures like clothing and sunscreen reduce the biologically effective UV dose (p < 0.05), directly supporting primary prevention of cutaneous melanoma associated with intermittent UV exposure. A large matched cohort study of 145,104 individuals over 3.44 million person-years demonstrated that greater sun exposure correlates with increased melanoma incidence, with solar keratosis—a UV damage marker—strongly predicting risk (OR = 1.28, 95% CI 1.23–1.34, p < 0.001). A diagnostic accuracy study further reinforced prevention by developing real-time sunburn alerts, noting that melanoma survival depends directly on stage at detection, making UV avoidance a frontline defense. Protective clothing, sunscreen application, and shade-seeking during peak UV hours form the core preventive strategy.

Evidence

Phosphodiesterase Type 5 Inhibitors and Risk of Malignant Melanoma: Matched Cohort Study Using Primary Care Data from the UK Clinical Practice Research Datalink.

Authors: Anthony Matthews, Anthony Matthews, Ian J Douglas, Krishnan Bhaskaran, Liam Smeeth, Sinéad M Langan

Published: June 1, 2016

A matched cohort study of 145,104 PDE5 inhibitor users and 560,933 controls across 3.44 million person-years of follow-up identified 1,315 incident melanoma cases. The apparent association between PDE5 inhibitor use and melanoma (HR = 1.14, 95% CI 1.01-1.29, p = 0.04) was explained by confounding from sun exposure. Negative control outcomes related to sun exposure showed similar risk increases: basal cell carcinoma (HR = 1.15, 95% CI 1.11-1.19, p < 0.001) and solar keratosis (HR = 1.21, 95% CI 1.17-1.25, p < 0.001). Post hoc analysis confirmed solar keratosis was strongly associated with future PDE5 inhibitor use (OR = 1.28, 95% CI 1.23-1.34, p < 0.001), indicating greater sun exposure among these men. No dose-response relationship was found (p-trend = 0.83).

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SKINCure: An Innovative Smart Phone-Based Application to Assist in Melanoma Early Detection and Prevention

Authors: Abuzaghleh, Omar, Barkana, Buket D., Faezipour, Miad

Published: December 1, 2014

A diagnostic accuracy study developed a smartphone-based melanoma prevention system incorporating a real-time sunburn alert using a novel equation to compute individual skin burn time from UV exposure. The system was validated on the PH2 Dermoscopy image database from Pedro Hispano Hospital containing 200 dermoscopy images of normal, atypical, and melanoma lesions. The melanoma detection component achieved classification accuracy of 97.5% for melanoma, 96.3% for normal, and 95.7% for atypical images. Melanoma spreads through metastasis with high fatality rates, and survival rates depend directly on the stage at detection, supporting sun exposure prevention as a primary risk reduction strategy alongside early detection.

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Urinary thymine dimer as a biomarker of exposure to ultraviolet radiation

Authors: Sandberg Liljendahl, Tove

Published: April 19, 2013

This cohort study validated urinary thymine dimers (T=T) as a biomarker of UV radiation exposure across multiple exposure scenarios. A significant dose-response relationship was demonstrated after single outdoor exposures, with children and adults forming similar amounts of T=T per unit dose. In outdoor workers, continuous exposure produced steady-state urinary T=T levels reflecting the prior three days of exposure. The biomarker was significantly correlated between skin tissue and creatinine-corrected urine samples (p < 0.05). The study confirmed that cutaneous malignant melanoma is associated with intermittent UV exposure patterns, and that dose-limiting measures (clothing, sunscreen) reduce the biologically effective dose, supporting their use in primary prevention.

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