They either undergo immune tolerance induction therapy, which is extremely expensive and sometimes fails, or are treated with bypassing agents that are also ruinously costly and not always effective.

• 他们要么接受免疫耐受诱导治疗，这是极其昂贵的，有时还会失败，或者采用旁路治疗，同样也是价格不菲，而且并不总是有效的。