i was diagnosed with a brain tumor, i had 2 brain surgeries, 6 weeks of radiation, and just finished 1 year of chemotherapy. After finishing the radiation treatment, i lost the hair on the front and middle off my head.Its been 15 months since finishing the radaition and the hair that has grown in is very fine and sparse.Do you know how long i will have to wait for it to grow in,it use to be thick and full.