The uterus, breast and ovaries all need iodine to function properly. I had large uterine fibroids, fibrocystic breast disease and ovarian cysts. I increased my iodine intake to 50mg - 100mg per day for 6 months, and I now have no uterine fibroids, no FBD and no ovarian cysts. I still have 25mg of iodine per day as a maintenance dose, because I am prone to these problems.
Yes, iodine is also a great idea. I still prefer herbal sources though and in this case would go with the black walnut hull since it is also a mitosis inhibitor. This can help further slow down the growth of the tumor. At least use the black walnut in conjunction with another iodine source so you get the mitosis inhibition.