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.
Where the bladder cancer begins determines the type of cancer. Most bladder cancers are caused by transitional cell carcinoma, which begins in the cells that line the bladder walls. Another type is squamous cell carcinoma, which begins in thin, flat cells and is caused by infection and irritation.