Hello All, This my inaugural post (though I have reacted to others) I’ve seen many posts on HSCT and can ultimately see me going for this. I am an identical twin whose brother does not have MS (I am advised this happens with 75% of identical twins). I have also heard that there is some research suggesting that a lack of vitamin D pre-birth could be factor to explain why some get MS, which makes sense as I was the runt of the litter. My question is, has anybody read anything about using stem cells from the healthy twin as part of HSCT? I am meeting with my consultant in November and would like to approach the meeting with as much info. as I can. ( I have tried searching “HSCT” on this site before asking the question) All the best Dan