TF and myeloid sarcoma: However, the serum levels of transferrin and ferritin are not always altered in MS, as studies showing alterations contrast with others showing no difference in concentrations [90], such as the study by Ptaszek et al. who reported no change in the mean values of transferrin, ferritin, and iron in people with MS compared to healthy people, but only a significantly lower level of transferrin after 20 sessions of WBC, although within normal limits.