Although no studies of CPXM2 have been reported thus far in MS, it is interesting to mention that experimental autoimmune encephalomyelitis (EAE) mice deficient for another metallocarboxypeptidase that shares protein homology with CPXM2, carboxipeptidase N, had attenuated EAE disease course and reduced spinal cord inflammation and demyelination [23], data that indirectly support the association observed in our study between CPXM2 and aggressive MS phenotypes. This evidence concerns the gene CPXM2 and myeloid sarcoma.