One experiment at the University of Cambridge saw researchers analyse 79 different cell lines, grown from the intestine, kidney, pancreas, lung and skin tissues of 11 individual naked mole-rats. Researchers infected the cells with modified viruses to introduce cancer-causing genes. To their surprise, the infected naked mole-rats cells began to multiply rapidly. This confirmed that it"s the environment of the naked mole-rat"s body that prevents cancer from developing, rather than a cell-level trait.