It has been suggested that the thymidine degradation products 2-deoxy-d-ribose-1-phosphate and 2-deoxy-d-ribose are sources of free radicals, and that this oxidative stress increases the production of the angiogenic factors IL-8, VEGF, and MMP-1 by tumour cells [10]. This evidence concerns the gene CXCL8 and neoplasm.