Cancer is unique in the staggering numbers of variants it has. cancer originates from the body’s own cells- if a cell can divide, it has the capability of developing into a cancer. Being so different in characteristics from each other, different cancers of even the same organ can have different appearances, prognoses, behaviors, aggression, treatment response and even chance of recurrence. Two cancers, both originating in the breast for instance, may have different gene mutations and because of that, one may be survivable and the other may not.