The dermis, the skin's next layer, is a thick layer of fibrous and elastic tissue (made mostly of collagen, with a small but important component of elastin) that gives the skin its flexibility and strength. The dermis contains nerve endings, sweat glands and oil (sebaceous) glands, hair follicles, and blood vessels.
âAll cancers are caused by genetic mutations, and in some cases we know the processes driving them, for example, tobacco smoking in lung cancer, however, our understanding of the causes of mutation in most cancers is remarkably limited,â Grimmond says.
Lung cancer has been the leading cause of cancer deaths among men in developed countries for decades, and the leading cause of cancer death for U.S. women for some years. The disease is almost always caused by smoking, said lead researcher Lindsey Torre, an epidemiologist at the American Cancer Society.