If you relapse after an allo transplant would you get another? Is that when donor site infusions come in?

If you relapse after an allo transplant would you get another? Is that when donor site infusions come in?
What is maintenance therapy and how does it differ from consolidation and induction?
BETA - What is a 1q gain? How does this affect risk of progression?
BETA - What is meant by hyperdiploid myeloma? How does this affect risk?
BETA - What does it mean if you have a mutation in chromosome 17 and a deletion?