Freebase(0.00 / 0 votes)Rate this definition: Arbol is a programming language which has been primarily developed for use in Genetic Programming experiments. It is a functional programming language inspired by the ideas of other small and esoteric languages.
Causes. In most cases of colon or rectal cancers, the cause or causes are unknown. Defects in genes that normally protect against cancer play the major role in causing polyp cells to continuously change and become cancerous.
This theory states that 15% of cancers are caused by viruses. One example is HPV, which causes cervical cancer i.e. cancer of the cervix in women. The virus is lysogenic and it inserts a destructive gene into the tumor suppressor T53 gene. This allows a mutated oncogene to cause a cell to become cancerous.his theory states that 15% of cancers are caused by viruses. One example is HPV, which causes cervical cancer i.e. cancer of the cervix in women. The virus is lysogenic and it inserts a destructive gene into the tumor suppressor T53 gene. This allows a mutated oncogene to cause a cell to become cancerous.