Scientists have revealed the detailed genetic makeup of thousands of cancer samples, giving new insights into the genes that drive the many forms of the disease. The results of the study, published in the Journal Nature, interpret DNA sequences of 2,658 cancer samples. The study is the work of some 700 scientists from around the world. The project found that people's cancers contain, on an average, four to five key genetic mutations that drive a cancer's growth. This can help in developing treatments that attack these "driver mutations".The challenge lies in finding which of these mutations will go on to become cancer and which can be safely ignored.