Hi Gina
The choice of drugs after relapse can vary on the trials after CTD comes Velcade has your mum had it,you might be able to ask if this is available for your mum,it is having good results,but only seems available on trials.
Melphalan is given to kill the cells,people have it as part of SCT,, Chris are you on any other treatment now?.??
I would advice you to speak to consultant,your mum must be hitting early fifty,s and if she has SC left and is fit enough,why not another SCT,there are a few people on here who have gone down that root. Ev