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.
Answer 3: Cancer results when a cell that is not growing suddenly decides to grow out of control and form a tumor. The way in which cancer kills varies, depending on what is affected. The most lethal cancers are those that are metastatic, where a single cell breaks off, migrates and starts a new tumor.