A year or so ago I signed up for the bone marrow program at work because Citi was paying for it and I thought it was a good idea.
2-3 months ago I got the call that I was a 6/6 match to a man in his early 40's who had childhood leukemia which is way worse to get as an adult. They called on Friday afternoon and Monday morning they sucked out a ton of blood to see if our different bloods were compatible (basically that his didn't try to attack mine) and to see how well we matched on the last 4 markers. Halfway through testing of the blood he passed away and we just found out.
So if your husband or dad died recently and was AB+ and had childhood leukemia and they told you they were working on a match then it might of been me. I am sorry he passed away before they they could complete his transplant :(