The Budwig diet is very commonly used, not everyone sticks to all of it but basically it does move your diet into a direction that will to try to slow the process. Diet is important in the curing of cancer, though not always does a change in diet alone cures it. There is always those that will find positive results and for them they are lucky.
Using the Cesium, it is a method basically of getting the cancer cells to react to oxygen and by doing so there is a change in how cancer replicates. There is a good site I found that you will find of good interest. It does discuss the work of Dr. Otto Warburg who studied the effects oxygen has on cancer cells. If you lower the oxygen levels to near 38% the cell will begin to turn cancerous. Why? It is that when a cell has a low amount of oxygen that it can be invaded by bacterium that then begins to turn off normal triggers for cells. So long as the cell remains with low oxygen as it trigger now says it needs, its self dying trigger, and normal replication; all begins the new cancer to grow and spread. Without something to stop the process, it will spread. The Cesium will interrupt the low oxygen and allows rapid oxygenation of the cells, hence, the cells will die.
Dr Otto Warburg's ideas as well as other doctors of the same caliber are behind the studies of Dr. Smith who developed the Bx Antitoxin that instead of allowing rapid oxygenation it targets the bacterium; killing the bacterium the trigger switches turn back on; oxygen invades, cells die and replication stops.