An anonymous reader writes UK researchers say they've devised a simple blood test that can be used to diagnose whether people have cancer or not. The Lymphocyte Genome Sensitivity (LGS) test looks at white blood cells and measures the damage caused to their DNA when subjected to different intensities of ultraviolet light (UVA), which is known to damage DNA. The results of the empirical study show a distinction between the damage to the white blood cells from patients with cancer, with pre-cancerous conditions and from healthy patients. "Whilst the numbers of people we tested are, in epidemiological terms, quite small (208), in molecular epidemiological terms, the results are powerful," said the team's lead researcher. "We've identified significant differences between the healthy volunteers, suspected cancer patients and confirmed cancer patients of mixed ages at a statistically significant level .... This means that the possibility of these results happening by chance is 1 in 1000." The research is published online in the FASEB Journal, the U.S. Journal of the Federation of American Societies for Experimental Biology.