Rife can be a good choice but can be expensive. A top of the line GB4000 fully equipped can cost several thousand dollars.
If you get a zapper, get a good multi-frequency zapper. Since I am a seller, I am not going to mention specifics.
Cancer can have its cause in many things from environmental toxins to parasites to nutritional deficiencies. So it is important to track down the cause or it will keep coming back even if you are successful in getting rid of it for now.
Be careful when mixing various protocols, this can at times have unintended effects.