http://www.physorg.com/news65805183.html

all diferents types of cancer must have a commomn agent that produce a deffect in the biological clock that have gens that already agent in the embryos stem cell-those signatures already are presents in parts of the dna that is linked the that gens that regule the biological clocks that generate enzims that regulate differentiation and growth of the cells.then some enzim are altered by the gens,creating a hybrid enzim,that does the cancer cells modify the normal cells,altering the the rhytms of differentiation and growth of the normal cells,as the teleromase that appear in many tumors.when a cancer cell modify the rearrange of the dna of the normal cells.those begin the actue of form altered,and produce hybrids enzims that glueing the cancer cells-generating the tumor