Astonishingly, in spite of decades of research, there is no agreed theory of cancer, no explanation for why, inside almost all healthy cells, there lurks a highly efficient cancer subroutine that can be activated by a variety of agents - radiation, chemicals, inflammation and infection.
I think we are living in selfish times. I'm the first one to say that I'm the most selfish. We live in the so-called 'first world,' and we may be first in a lot of things like technology, but we are behind in empathy.