Since the dawn of technology and advances in science, it can be commonly believed that the cause of cancer comes from almost anything modern, like cigarettes, modified nutrition, machinery, and radiation, etc. The University of Cambridge has trumped that belief by using X-Rays and CT scans on medieval bones to search for osteosarcomas, which in deed do exist. "The investigators found rates of cancer about 10 times higher than had been previously discovered through examining only the bones' exteriors for lesions." The researchers found signs of cancer mostly in the pelvis. They projected a higher estimate of 9% to 14% because CT scans detect bone metastases about 75% of the time, and only one-third to one-half of cancer deaths involve spread to the bone.