NEFL and myeloid sarcoma: In this specific group of patients, CSF NfL demonstrated to be an independent, though weak, predictor of the development of a first clinical episode suggestive of MS [hazard ratio (HR) = 1.02, 95% confidence interval (CI) 1.00–1.04, p = 0.019], or even of MS (HR = 1.03, 95% CI 1.01–1.05, p = 0.003).