I have seen some large breasts though I have not performed hypnosis for their enlargement yet I Imagine I may. It is possible, I have some clinical studies. It is not a simple therapy. I can think of at least 3 therapies that would need to be combined.
I would combine a replacing of limiting beliefs therapy, with one that suggests the body concentrate on those cells and bringing more blood and nourishment etc...also perhaps now that I think about it I would also do some type of timeline therapy or go back to when the breasts first began developing and encourage their growth.
Yes it is possible I have seen documented clinical studies. Not sure I can direct you anywhere just know that it is possible
I am developing some self-hypnosis cds maybe I will work on this.