Polio for all it's complexity has one root cause, a viral infection. The poliovirus was first isolated in 1909, by which time the concept of vaccination was rel

Polio for all it's complexity has one root cause, a viral infection. The poliovirus was first isolated in 1909, by which time the concept of vaccination was relatively well understood. It still took decades to get a working safe vaccine, after root cause, and generalized course of action were known. Cancer as a whole has none of those characteristics.