According to the present invention, the amount of a plasmablast (PB) in a sample of a relapsing-remitting multiple sclerosis (RRMS) patient can be measured, thereby predicting the therapeutic effect of interferon beta (IFN-β) or predicting a RRMS case for which the continuous administration of IFN-β is difficult due to the manifestation of a serious adverse reaction or the aggravation of concomitant immune disorder. In addition, the amount of PB in a sample of a RRMS patient can also be measured, thereby predicting the therapeutic effect of an IL-6 inhibitor in the treatment of RRMS. As a result, a treatment method effective for patients not suitable for IFN-β in the treatment of RRMS can be provided.
Method for predicting post-therapy prognosis of relapsing-remitting multiple sclerosis (RRMS) patient, and method for determining applicability of novel therapy