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| 245 | _ | _ | |a Clearance of JC polyomavirus from cerebrospinal fluid following treatment with interleukin‐2 and pembrolizumab in an individual with progressive multifocal leukoencephalopathy and no underlying immune deficiency syndrome |
| 260 | _ | _ | |a Oxford |c 2020 |b Blackwell Science91133 |
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| 520 | _ | _ | |a A 71‐year‐old Caucasian man presented with dysarthria and fluctuating hypoesthesia of the right upper limb in early 2019. Brain magnetic resonance imaging (MRI) demonstrated T2/fluid attenuated inversion recovery hyperintense lesions in the left parietal cortical grey matter and adjacent white matter compatible with embolic stroke of undetermined source. Eight weeks later, symptoms had further progressed with loss of adequate communication, disturbance of fine motor skills, ataxia and neuropsychiatric symptoms. Widespread disease on brain MRI and the detection of JC polyomavirus (JCPyV) DNA from cerebrospinal fluid (CSF) confirmed the diagnosis of progressive multifocal leukoencephalopathy (PML) [1]. Bone marrow biopsy revealed normal findings, and no underlying cause of reduced immunocompetence was identified. Despite rehabilitation, treatment with mirtazapine and two cycles of interleukin‐2 (IL‐2) (1 mio IE/m² sc once per day for 7 days) administered 2 weeks apart [1, 2], symptoms and MRI lesions further progressed, with complete immobility and severe dysphagia. Nine weeks after definite PML diagnosis and 4 weeks after the last IL‐2 dose, a total of three cycles of monthly infusions of pembrolizumab were applied. At the initiation of the third cycle of pembrolizumab, cognitive performance and fine motor skills had temporarily improved, and the patient had regained the ability to walk a few steps with assistance. On MRI, no increase in lesion load and no signs of an immune reconstitution inflammatory syndrome were noted. JCPyV DNA, after a decline that started already following the IL‐2 therapy, was no longer detected in CSF, collectively suggesting PML remission (Fig. 1). Enzyme‐linked immunosorbent assays revealed increasing JCPyV‐specific antibody titers in blood and CSF (AIJCPyV > 1.5 [3]). A pembrolizumab effect was indicated by reduced programmed cell death protein 1 (PD‐1) expression on peripheral CD4+ and CD8+ T cells after the treatment. Also, during the disease course of PML and following pembrolizumab treatment, proportions of innate immune cells (CD56dimCD16‐cytotoxic NK cells, CD14+ CD16 classical and CD14dim CD16+ non‐classical monocytes and CD11+ dendritic cells) and pro‐inflammatory cytokines and chemokine increased (Appendix S1, Table S1). Four weeks following the last infusion with pembrolizumab, aspiration pneumonia was suspected, and the patient received intravenous piperacillin/tazobactam 4/0.5 g three times per day for 7 days with temporary relief of symptoms. No causative bacteria were detected from blood cultures. Six weeks post‐pembrolizumab treatment, respiratory distress occurred again, and the general clinical condition further deteriorated. The patient and his legal custodians decided not to receive further hospital care, upon considering the severe and persistent disability, and the patient died shortly thereafter. As an autopsy was not performed, alternative causes of respiratory distress, such as autoimmune pneumonitis that might occur as an adverse event of pembrolizumab therapy, could not be ruled out. |
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