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 has led to the discovery of the APC gene â the gatekeeper in colon cancer development. âCancer is in essence a genetic disease. It's caused by mutations of genes and there are three kinds, three types of genes, that contribute to cancer. The first is called oncogenes. These are genes that normally signal cells to grow. And when an oncogene is mutated, the cell continues to grow even though normally it wouldn't.