Although high prevalence of nephrotic syndrome in autoimmune nodopathies associated with anti‐CNTN1 IgG4 [5, 7, 10, 11], anti‐pan‐neurofascin IgG1 [12], or anti‐NF186 IgG [13] has increasingly been emphasized, routine urinalysis, which can be performed at every hospital, is not recommended in the diagnostic guidelines [2, 14]. The gene discussed is CNTN1; the disease is nephrotic syndrome.