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.
Stress fuels cancer by triggering a 'master switch' gene which allows the disease to spread, according to new research. The 'unexpected' discovery could lead to the development of drugs that target the protein and stop tumours spreading to other organs and causing death.