1. You are misreading Smyth. He never said EVERY cancer patient had a large thyroid.
2. Please look at the problems of cassava-based diets and goiter. There is ample literature.
3. Vulc's statement: "The word "goitrogen" is most often used by those having little knowledge of any of this."
This statement is an ad hominem attack demeaning the investigators in order to dismiss the information. Please stick to the information because you cannot know how much research those using the word, "goitrogen" have done.
DIM's benefits remain an alt med urban legend. You can test urine or blood until you are blue in the face. When DIM patients report swollen thyroids and nodules, you are dealing with a goitrogen.