NCIt definition : Any mutation with an origin in cells that are not destined to become gametes. As a
consequence, such mutations are not transmitted to progeny, though they will be transmitted
during any mitosis within the individual. Somatic mutations may contribute to a broad
variety of pathologies including cancer.;
Alternative definition : NCI-GLOSS: An alteration in DNA that occurs after conception. Somatic mutations can
occur in any of the cells of the body except the germ cells (sperm and egg) and therefore
are not passed on to children. These alterations can (but do not always) cause cancer
or other diseases.; CDISC: Any non-inheritable variation in the DNA that is not transmitted to the progeny
but will be maintained during any mitosis within the individual.;