The course of a cancer is as unpredictable as that of the individual. Many a cancer dies with its owner. Cancer in its occurrence exhibits a predictable certainly at the level of herd, but always remains a matter of chance or probability at an individual level. World over, the overall cancer occurrence is one in five humans. This holds good even in animals 21 specially inbred in laboratories for studying cancer-occurrence generation after generation.
Cancer is neither hereditary nor familial.
It is its very commonness that makes it occasionally seem so. Willis 20 has generalized that most of the 'cancer families' exemplify only the laws of chance. A cancer is for the owner, a part of his or her own flesh and blood. It cannot be attacked with impunity without damaging other normal tissues. All anticancer agents treat cancer cells in the same manner as they treat all normal cells.