Why is St. Jude's Research Hospital named after him?

St. Jude is the patron saint of hopeless causes. I remember reading Danny Thomas' story of the promise he made to God when he was down and out, long before he 'made it'.

The promise, he made, was to build and found a Hospital named St. Judes Children's Hospital that would care and treat youngsters of all ages while in pursuit of finding cures for cancers.