NEFL and myeloid sarcoma: When compared to our MS population, an analysis of 108 cognitively unimpaired volunteers from the Baltimore Longitudinal Study of Aging (average age of 55.7 years old) demonstrated that a higher CP volume was cross-sectionally significantly associated with GFAP levels (r = 0.22, p = 0.002) but not with serum NfL levels (p = 0.35) [21].