Medicine is approaching a conceptual  impasse. It lacks concepts to handle two attributes of the organism:  Complexity  and optimality.
This ominous course is  illustrated in light of  the theory of cancer and oncology.
My arguments are  illustrated on a series of articles published by Nature, called Cancer milestones
My presentation follows  along the time line of the milestones  series. Please read it first.
http://www.nature.com/milestones/milecancer/timeline.html
I show that that cancer is an optimal phenomenon.
More on this topic in
http://www.what-is-cancer.com