Iodine, along with potassium, Vitamin D, oxygen and pH are all very important to help beat and avoid cancer. But Iodine alone? If only it were that simple.
Gerson certainly liked and believed in the use of Iodine and it was a very important part of his treatment protocol, especially in his later years (he initially used Iodine only in cases of low metabolic rates). He had about a 50% success rate.
I don't think I would forego de-tox/cleansing, a healthy Diet of mostly or wholly raw fruits and vegetables, attention to potassium, Vitamin D, oxygen and pH levels AND one or more potent anti-cancer and immune boosters soley in favor of just iodine, but I would certainly agree with it being a vital element to incorporate.