System and methods for treating cancer cells with alternating polarity magnetic fields

A method of using magnetic fields to treat cancer cells in a target body area of a patient, comprising:

• using a magnetic field therapy system comprising:
• an alternating polarity (AP) magnetic field generator;
• one or more AP electromagnetic coils electrically coupled to the AP magnetic field generator, wherein the one or more AP electromagnetic coils are energized by an electrical signal from the AP magnetic field generator to generate an AP magnetic field having at least a first frequency and a first field strength;
• and
• a controller to control at least one of the first frequency and the first field strength of the AP magnetic field generated by the one or more AP electromagnetic coils;
• coupling the one or more AP electromagnetic coils to at least a first portion of the patient's body;
• generating an AP magnetic field having a first frequency of 0.5-500 kHz and a first field strength of 0.2-5 mT using the one or more AP electromagnetic coils;
• applying the generated AP magnetic field to treat the cancer cells, wherein the generated AP magnetic field selectively affects the cancer cells to prevent metastasis of at least a portion of the cancer cells, while leaving non-cancer cells substantially unharmed.