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March 2018; 5 (2) Clinical/Scientific NotesOpen Access

Natalizumab may control immune checkpoint inhibitor–induced limbic encephalitis

Andreas F. Hottinger, Rita de Micheli, Vanessa Guido, Alexandra Karampera, Patric Hagmann, Renaud Du Pasquier
First published January 11, 2018, DOI: https://doi.org/10.1212/NXI.0000000000000439
Andreas F. Hottinger
From the Department of Clinical Neurosciences (A.F.H., V.G., A.K., R.D.P.), Department of Oncology (A.F.H., R.d.M.), and Department of Radiology (P.H.), CHUV University Hospital & University of Lausanne, Switzerland.
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Rita de Micheli
From the Department of Clinical Neurosciences (A.F.H., V.G., A.K., R.D.P.), Department of Oncology (A.F.H., R.d.M.), and Department of Radiology (P.H.), CHUV University Hospital & University of Lausanne, Switzerland.
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Vanessa Guido
From the Department of Clinical Neurosciences (A.F.H., V.G., A.K., R.D.P.), Department of Oncology (A.F.H., R.d.M.), and Department of Radiology (P.H.), CHUV University Hospital & University of Lausanne, Switzerland.
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Alexandra Karampera
From the Department of Clinical Neurosciences (A.F.H., V.G., A.K., R.D.P.), Department of Oncology (A.F.H., R.d.M.), and Department of Radiology (P.H.), CHUV University Hospital & University of Lausanne, Switzerland.
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Patric Hagmann
From the Department of Clinical Neurosciences (A.F.H., V.G., A.K., R.D.P.), Department of Oncology (A.F.H., R.d.M.), and Department of Radiology (P.H.), CHUV University Hospital & University of Lausanne, Switzerland.
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Renaud Du Pasquier
From the Department of Clinical Neurosciences (A.F.H., V.G., A.K., R.D.P.), Department of Oncology (A.F.H., R.d.M.), and Department of Radiology (P.H.), CHUV University Hospital & University of Lausanne, Switzerland.
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Citation
Natalizumab may control immune checkpoint inhibitor–induced limbic encephalitis
Andreas F. Hottinger, Rita de Micheli, Vanessa Guido, Alexandra Karampera, Patric Hagmann, Renaud Du Pasquier
Neurol Neuroimmunol Neuroinflamm Mar 2018, 5 (2) e439; DOI: 10.1212/NXI.0000000000000439

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    Figure Immune checkpoint inhibitor–induced encephalitis before and after treatment with natalizumab

    A 71-year-old woman was diagnosed in 2014 with small-cell lung cancer. In 2016, she was treated with nivolumab and ipilimumab for systemic recurrence. Four days later, she developed severe disorientation and short-term memory deficits. Brain MRI shows bilateral contrast-enhancing lesions with associated T2 hyperintensity of the hippocampi (A and B). The images normalize after 6 months of treatment with natalizumab (C and D).

  1. Andreas F. Hottinger, MD, PhD,
  2. Rita de Micheli, MD*,
  3. Vanessa Guido, MD*,
  4. Alexandra Karampera, MD*,
  5. Patric Hagmann, MD, PhD* and
  6. Renaud Du Pasquier, MD
  1. From the Department of Clinical Neurosciences (A.F.H., V.G., A.K., R.D.P.), Department of Oncology (A.F.H., R.d.M.), and Department of Radiology (P.H.), CHUV University Hospital & University of Lausanne, Switzerland.
  1. Correspondence
    Dr. Hottinger Andreas.hottinger{at}gmail.com
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In recent years, new therapeutic approaches that restore the ability of the immune system to attack cancer cells have dramatically improved the outcome of various malignant tumors, including melanoma and lung cancer. Ipilimumab, a monoclonal antibody that binds and inhibits cytotoxic T-lymphocyte–associated antigen 4, and nivolumab, a monoclonal antibody that blocks programmed cell-death protein 1, have been approved. As these treatments, respectively, block T-cell inhibition and potentiate the activation of T cells, they may trigger a number of neurologic immune-related adverse events,1,–,9 as illustrated here.

We describe a 71-year-old woman who was diagnosed in 2014 with stage IV small-cell lung cancer and treated with 6 cycles of cisplatin/etoposide, followed by mediastinal and prophylactic cranial irradiation. Because of tumor progression in the lung and liver, she received a first dose of nivolumab 1 mg/kg, followed by ipilimumab 3 mg/kg. On day 4 following administration, she developed short-term memory deficits that worsened over the next 5 days. On admission, she was found to be disoriented in time and space and unable to recall any word after 5 minutes. Autobiographic memory was preserved. She presented dysexecutive disorder and was unable to read or write. MRI showed severe abnormalities in both hippocampi with contrast-enhancing lesions (figure, A and B). A lumbar puncture showed lymphocytic pleocytosis (white blood cells: 16 cells/μL; 87% lymphocytes, 12% monocytes, and 1% neutrophils, and increased CSF protein [1,145 mg/L]). Cytologic examination showed no evidence of malignant cells. Extensive evaluation of blood and CSF revealed no evidence of infection. The CSF was positive for anti-HU antibodies as well as for an uncharacterized antibody against Purkinje cells. It was negative for other antibodies including CASPR2, recoverin, Sox1, Titin, Zic4, DNER/Tr, amphiphysin, CV2/CRMP5, Ma2/Ta (PNMA2), Ri, Yo, GAD65, NMDAR, GABAR, IgLON5, AMPAR2, DPPX, LGI1, glycine receptor, and mGluR5. Nivolumab and ipilimumab were discontinued, and the patient was treated with high-dose IV methylprednisolone (1,000 mg). After 5 days, steroids were progressively tapered off; the patient, however, showed new clinical deterioration requiring introduction of natalizumab and a new temporary increase in steroids. Thereafter, steroids could be weaned off completely, and the patient showed neurologic improvement within 2 months of starting natalizumab as well as marked improvement of the MRI findings (figure, C and D). The patient is now able to recall 3/5 words at 5 minutes and can read and write. It is important to note that despite having received a single dose of nivolumab/ipilimumab, the patient showed a durable oncologic response.

Figure
Figure Immune checkpoint inhibitor–induced encephalitis before and after treatment with natalizumab

A 71-year-old woman was diagnosed in 2014 with small-cell lung cancer. In 2016, she was treated with nivolumab and ipilimumab for systemic recurrence. Four days later, she developed severe disorientation and short-term memory deficits. Brain MRI shows bilateral contrast-enhancing lesions with associated T2 hyperintensity of the hippocampi (A and B). The images normalize after 6 months of treatment with natalizumab (C and D).

This case illustrates several key points: (1) As evidenced by the presence of anti-Hu antibodies, this patient had autoimmune encephalitis, which was likely exacerbated by the hyperactivation of T cells, induced by nivolumab/ipilimumab: The timing of the onset of neurologic symptoms strongly suggests an immune-related adverse event.10 Indeed, 3 other cases of paraneoplastic encephalitis that developed early, i.e., within days of initiation of immune checkpoint inhibitors, were described.1,4 (2) Paraneoplastic encephalitis may present with gadolinium enhancement on MRI.11 (3) Early recognition and treatment with immune-suppressive agents are essential, as these patients may show marked improvement. (4) More importantly, these side effects are typically controlled by high-dose steroids that act as potent immune suppressors; however, steroids might also block the response of the checkpoint inhibitors against cancer, thus impeding the advantages that are precisely expected with the latter drugs.4 Natalizumab, a drug used for treating multiple sclerosis and Crohn disease,12 might be an ideal drug to control paraneoplastic encephalitis induced by immune checkpoint inhibitors: it is directed against the subunit α4 from a4β1 and a4b7-integrins. Yet, these integrins, expressed at the surface of lymphocytes, bind to vascular cell adhesion molecule-1 and mucosal vascular addressin cell adhesion molecule-1, which are expressed on endothelial cells of the blood-brain and blood-gut barriers, respectively. This interaction decreases leukocyte adhesion, attachment, and migration across these barriers.13 However, the immune response in other compartments is not impeded. Therefore, we hypothesize that, in our case, administration of natalizumab contributed to decrease the CNS inflammation without compromising the immune reaction against systemic localizations of the cancer and therefore allowed for continuation of immune checkpoint inhibitor therapy, despite the development of paraneoplastic encephalitis. In our patient, we believe that natalizumab played a key role in controlling the autoimmune adverse event, as steroids could be tapered well before the end of the half-life of the checkpoint inhibitors. As these cases are extremely rare, we propose to set up a registry to collect data on the presenting symptoms, treatments, and outcomes of these patients.

Author contributions

Dr. Hottinger: study concept and design, acquisition of data, analysis and interpretation, critical revision of the manuscript for important intellectual content, and study supervision. Dr. de Micheli: acquisition of data, analysis and interpretation, and critical revision of the manuscript for important intellectual content. Dr. Guido and Dr. Karampera: acquisition of data and critical revision of the manuscript for important intellectual content. Dr. Hagmann and Prof. Du Pasquier: acquisition of data, analysis and interpretation, and critical revision of the manuscript for important intellectual content.

Study funding

No targeted funding reported.

Disclosure

A.F. Hottinger served on the scientific advisory board of Novocure and BMS; received travel funding from Novocure; and served on the speakers' bureau (funds provided to institution) of Novocure. R. de Micheli, V. Guido, A. Karampera, and P. Hagmann report no disclosures. R. Du Pasquier served on the scientific advisory board of Biogen, Genzyme, Merck, and Novartis; received travel funding and/or speaker honoraria from Sanofi, Genzyme, and Rochel; served on the editorial board of Neurovirology; and received research support from the Swiss National Foundation and the Swiss Society for Multiple Sclerosis, Novartis. Go to Neurology.org/NN for full disclosure forms.

Footnotes

  • ↵* These authors contributed equally to this work.

  • Go to Neurology.org/NN for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.

  • The Article Processing Charge was funded by the authors.

  • Received August 31, 2017.
  • Accepted in final form November 13, 2017.
  • Copyright © 2018 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND), which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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