Cancer comes about due to terrain and the variables within that context. It is a communication breakdown and coherency is lost in the structure of the human organism. There are many variables but there is a common theme that is the link.
Imbalance at many levels and these levels are actually harmonic as well. mental, emotional physical. The informational expression repeats throughout each harmonic like notes over scales.
Health is a question of balance and reality is informational in essence. The informational template must be in balance or coherent in it's structure.
Toxins in all forms whether mental, emotional or physical act as dis-harmonic resonance (informational exchange) and influence the informational construct of the human structural makeup. This is why the people who say emotions are the root cause are correct. This is why people who say toxins are the cause are correct. This is why people shoo say viruses, etc are correct. All of these things alter balance which affects the overall terrain in various ways with the same end result no matter what the vector. Cause/effect....