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.
The most common causes of cancer death worldwide have changed little over the last 40 years. Lung, liver, stomach and bowel cancers have been the four most common causes of cancer death since 1975.[ 1-7 ]. Caution should be taken when interpreting trends over time for cancers worldwide because changes probably also reflect changes in data recording.