Very good question, thanks for asking.
the issue remains contentious but the body of evidence is still very much in favour of sunscreen use for skin cancer prevention.
Study by Green et al, (Green A, Williams G, Neale R, et al. Daily sunscreen application and betacarotene supplementation in prevention of basal‐cell and squamous‐cell carcinomas of the skin: a randomised controlled trial. Lancet 1999; 354: 723–729.) showed beneficial effects of sunscreens on Squamous cell carcinoma prevention. Role in Basal Cell Carcinoma prevention was equivocal.
Role of sunscreens in prevention of melanomas is even more controversial. (Westerdahl J, Ingvar C, Mâsbäck A, et al. Sunscreen use and malignant melanoma. Int J Cancer 2000; 87: 145–150.)
A recent follow up study by the same authors (Green et al) however, was more conclusive in that the number of melanomas and importantly invasive melanomas were fewer in sunscreen arm of the study as compared to the control arm. (Green AC, Williams GM, Logan V, et al. Reduced melanoma after sunscreen use: randomized trial follow‐up. J Clin Oncol 2011; 29: 257–263.)
In sum, I would still recommend sun cream use to my patients who are at risk of developing skin cancers.
Best wishes
Vishal
Dr. V Madan, M.B.B.S (Hons), M.D, FRCP, CCT Dermatology
President, British Medical Laser Association
Consultant Dermatologist and Clinical Director
Everything Skin Clinic
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