An earlier study, consisting of 46 patients with MS (PwMS) and their siblings, could not detect correlations of prostaglandin E2 (PGE2) and 15(S)-HETE with neurofilament light (NfL) and glial fibrillary acidic protein (GFAP),8 markers of neuroaxonal damage and astrocyte activation, respectively. This evidence concerns the gene GFAP and myeloid sarcoma.