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Age of onset of skin cancers in normal and xeroderma pigmentosum (XP) skin cancer patients. The cumulative percentage of patients with BCCs or SCCs of the skin is plotted versus the age at diagnosis. The curve for the normal population is based on 29,757 skin cancers surveyed by the National Cancer Institute (1). The curve for the xeroderma pigmentosum patients is based on 63 skin cancers reported to the Xeroderma Pigmentosum Registry (unpublished data).
