Case 5, who had CIDP and responded to IVIG treatment, continued to have IgM antibodies against NF186 over the course of 8 months, during which time 4 samples were collected at 2- to 4-month intervals and the patient was still experiencing weakness but much improved symptoms as a result of regular IVIG infusions. Here, CD40LG is linked to chronic inflammatory demyelinating polyradiculoneuropathy.