Correlations of NfL levels with neurological scores, as well as by ambulatory status or FRDA‐related comorbidities, were investigated: 20 patients (10.6%) had diabetes, 12 patients (6.5%) had optic atrophy, and a total of 106 (57%) patients had cardiomyopathy. The gene discussed is NEFL; the disease is Leber hereditary optic neuropathy.