BCHE and amyotrophic lateral sclerosis: Group 3 contained five ALS patients (female:male = 3:2; age at onset of ALS: 37–88 years old) who were only positive for AChR-ab in sera (Table 3) but did not have any other characteristics of MG, including fluctuating symptoms, abnormal RNS test, or response to cholinesterase inhibitors.