Hi, Thanks for writing in. Since you had germ cell tumor some time back, it is possible that thin hair is due to the side effect of cancer treatment. Usually hair related problems due to cancer are temporary and there is return of complete hair growth within a year after cessation of treatment. You will also have a good regrowth in the coming months. If you feel that the growth is taking too long then please visit a dermatologist and take prescription of minoxidil topical solution. Please make sure that any other medicine that you are taking does not interact with this solution. This is applied over the areas of hair thinning in small amount to cause growth of thick hair. Please do not worry.