I am not much for praying personally. Not the religious type, but I know that visualization does work on things like this. Have your wife sit in a quiet spot and try to visualize the trouble area. Through the mind's eye you can "see" the lumps and the way they look. Then visualize a strong white light zapping away at the lump and picture it just disintegrating. Do this until you can visualize in your mind all the lumps and cancerous areas are gone. This is very similar to a shamanic technique that I use. You can even visualize for someone else...see into their body and heal them in that way. I have done it before to a relative of mine who had cancerous growths in the lungs. I did the visualization for him even though I was miles away and only had a picture to go by. But nevertheless, it worked because he went back to the doctor afterwards and the lumps had either gone away completely or were shrunken and no longer posed a threat to his body. The human mind is incredibly strong...we only use a small portion of it on a regular basis.
On a side note, even though I would consider myself more of an atheist, I do believe in ENERGY. Everything that exists basically is composed of energy. I also believe that if there is such a thing as "God", then that too is energy in some form or other. That is why prayers work because it is the power of will...another energy mover of the mind. I just tend to choose a more direct approach. Even that cancerous lump is no more than a bunch of atoms....as is the rest of our body. What happens sometimes though, is that energy can accumulate in certain areas in the body. In a healthy person there is a certain flow of energy that goes throughout the body and it is much like a river that flows. You know what happens when you put a dam in the middle of a river I'm sure. Keep the vital energy in the body flowing and you will avoid these blockages that cause cancer and sickness. Cancer is basically a lump of energy in the body that got stuck. Something prevented that energy from flowing properly and it basically just sat there and balled up forming a lump....the energy changed form as energy always does. The thing is though that if energy can change into a different form, it can also change for the better. The mind is the energy mover for our bodies. You can do it....anyone can.
Even though I don't really believe in God in the traditional sense (I believe that what could be called "God" is energy and consciousness, not a deity), I do believe that Jesus was a real person....a shaman of sorts....and also knew how to heal with energy.
Sorry to rabble on but... Just food for thought... Our caveman ancestors who were animistic (I am also an animist), believed that everything that existed, every rock, every tree, every stream or lake had some sort of spirit to it. They often worked with these spirits for healing and guidance. Scientifically speaking they were absolutely right! Everything that exists is animated by a force...energy. That energy is basically the "spirit" within all things. Even a rock that does not seem to move is nevertheless very "animate" or "spirited", because it is composed of energy....vibrational and never ceases it's movement. When you hear of shamans working with "spirits", they are actually working with energy that manifests itself in different forms. I believe that consciousness is also another form that energy takes. Anyways, sorry about that. That is just my personal view of things. However, the fact remains that healing is possible through the power of the mind.