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The following abstract from a US medical journal may be of interest :

http://www.find-health-articles.com/rec_pub_19326428-fiber-diffraction-skin-nails-provides-accurate-diagnosis-malignancies.htm

Fiber diffraction of skin and nails provides an accurate diagnosis of malignancies.

Full Abstract
An early diagnosis of malignancies correlates directly with a better prognosis. Yet for many malignancies there are no readily available, noninvasive, cost-effective diagnostic tests with patients often presenting too late for effective treatment. This article describes for the first time the use of fiber diffraction patterns of skin or fingernails, using X-ray sources, as a biometric diagnostic method for detecting neoplastic disorders including but not limited to melanoma, breast, colon and prostate cancers. With suitable further development, an early low-cost, totally noninvasive yet reliable diagnostic test could be conducted on a regular basis in local radiology facilities, as a confirmatory test for other diagnostic procedures or as a mass screening test using suitable small angle X-ray beam-lines at synchrotrons.