Ethics approval
This is not a clinical trial, but a case report. Although the patient was treated with mefloquine and mirtazapine, which are not approved as medications for PML by pharmaceutical and medical device agencies in Japan, the institutional committee for the evaluation of highly difficult new medical technologies approved the treatment.
Author contributions
YU, HN, JK, ST, KK, TH, and MY performed the clinical and bedside studies. KN, MS and ST performed the PCR for the detection of JCV. YU wrote the initial draft of the paper and all authors contributed to its preparation. The final version was read and approved by all authors.
Disclosure statement
No potential conflict of interest was reported by the author(s).