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.
Tumor Suppressor Genes and Oncogenes 44 I. INTRODUCTION Cancer is caused by the accumulation of mutations that lead to uncontrolled cell growth. It is an evolutionary process in which cells acquire mutations as a result of spontaneous and environmentally-induced DNA damage.