Cited by 3,488Autoimmune Neurological Disorders and TreatmentsPeripheral Neuropathies and DisordersMyasthenia Gravis and Thymoma

Anti-NMDA-receptor encephalitis: case series and analysis of the effects of antibodies

Open access
Dalmau, Josep, Gleichman, Amy J, Hughes, Ethan G, Rossi, Jeffrey E, Peng, Xiaoyu, Lai, Meizan, Dessain, Scott K, Rosenfeld, Myrna R +2 more·2008·The Lancet Neurology

Abstract

Summary Background A severe form of encephalitis associated with antibodies against NR1–NR2 heteromers of the NMDA receptor was recently identified. We aimed to analyse the clinical and immunological features of patients with the disorder and examine the effects of antibodies against NMDA receptors in neuronal cultures. Methods We describe the clinical characteristics of 100 patients with encephalitis and NR1–NR2 antibodies. HEK293 cells ectopically expressing single or assembled NR1–NR2 subunits were used to determine the epitope targeted by the antibodies. Antibody titres were measured with ELISA. The effect of antibodies on neuronal cultures was determined by quantitative analysis of NMDA-receptor clusters. Findings Median age of patients was 23 years (range 5–76 years); 91 were women. All patients presented with psychiatric symptoms or memory problems; 76 had seizures, 88 unresponsiveness (decreased conciousness), 86 dyskinesias, 69 autonomic instability, and 66 hypoventilation. 58 (59%) of 98 patients for whom results of oncological assessments were available had tumours, most commonly ovarian teratoma. Patients who received early tumour treatment (usually with immunotherapy) had better outcome (p=0.004) and fewer neurological relapses (p=0.009) than the rest of the patients. 75 patients recovered or had mild deficits and 25 had severe deficits or died. Improvement was associated with a decrease of serum antibody titres. The main epitope targeted by the antibodies is in the extracellular N-terminal domain of the NR1 subunit. Patients’ antibodies decreased the numbers of cell-surface NMDA receptors and NMDA-receptor clusters in postsynaptic dendrites, an effect that could be reversed by antibody removal. Interpretation A well-defined set of clinical characteristics are associated with anti-NMDA-receptor encephalitis. The pathogenesis of the disorder seems to be mediated by antibodies.

AI snapshot

Written from the paper’s full text.

TL;DR

This case series characterizes 100 patients with anti-NMDA-receptor encephalitis and shows that antibodies target the extracellular N-terminal domain of NR1, reduce cell-surface NMDA receptors and postsynaptic receptor clusters, and that early tumour treatment is associated with better outcome and fewer relapses. The disorder is severe but often reversible, with 75 patients recovering or having mild deficits and 25 having severe deficits or dying.

Key findings

  • Among 100 patients, median age was 23 years (range 5–76) and 91 were women; all presented with psychiatric symptoms or memory problems, 76 had seizures, 88 unresponsiveness, 86 dyskinesias, 69 autonomic instability, and 66 hypoventilation.
  • 58 (59%) of 98 assessed patients had tumours, most commonly ovarian teratoma; early tumour treatment was associated with better outcome (p=0.004) and fewer neurological relapses (p=0.009) than in other patients.
  • 75 patients recovered or had mild deficits and 25 had severe deficits or died; improvement was associated with a decrease in serum antibody titres.
  • Patients’ antibodies mainly targeted the extracellular N-terminal domain of NR1 and decreased cell-surface NMDA receptors and NMDA-receptor clusters in postsynaptic dendrites, an effect reversed by antibody removal.

Methods

  • Observational case series of 100 patients with encephalitis and NR1–NR2 antibodies; clinical information was obtained by authors or referring physicians, with control samples from 20 healthy individuals and 230 patients with suspected autoimmune or paraneoplastic encephalitis or tumours without encephalitis.
  • HEK293 cells expressing single or assembled NR1–NR2 subunits were used to map the antibody epitope; antibody titres were measured by ELISA, and effects on neuronal cultures were assessed by quantitative confocal analysis of NMDA-receptor clusters and by biotinylation/immunoblot of cell-surface NR1.
  • Statistical analyses used Fisher’s two-sided exact test, Kruskal-Wallis and Wilcoxon rank-sum tests with Bonferroni correction, and Kruskal-Wallis non-parametric ANOVA with Dunn’s pairwise comparison.

Limitations

  • The paper states that follow-up CSF titres were not obtained in most patients after improvement, and that future studies should clarify the best type and duration of immunotherapy, the role of prodromal events, and the molecular mechanisms decreasing NMDA receptors.
  • Evident from the text: this is an observational case series without randomized treatment allocation, so associations between early tumour treatment and outcome may be confounded; some clinical and laboratory data are reported as “data not shown.”
  • Evident from the text: the pathogenic evidence relies partly on in-vitro rat hippocampal neuronal cultures and HEK293 assays, which may not fully capture human disease mechanisms.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1016/s1474-4422(08)70224-2

Cites

35 of 35 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 27 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    76 of the 100 patients with anti-NMDA-receptor encephalitis had seizures.

    “All patients presented with psychiatric symptoms or memory problems; 76 had seizures, 88 unresponsiveness (decreased conciousness), 86 dyskinesias, 69 autonomic instability, and 66 hypoventilation.”
    • Also stated in: § Results · plain
      “During the first 3 weeks of symptom presentation, 76 patients had seizures.”
    Quote in the paperNot a substantial claim
  • Findingown data

    91 of the 100 patients with anti-NMDA-receptor encephalitis were women.

    “Median age of patients was 23 years (range 5–76 years); 91 were women.”
    Quote in the paperNot a substantial claim
  • Findingown data

    The median age of the 100 patients with anti-NMDA-receptor encephalitis was 23 years (range 5-76 years).

    “Median age of patients was 23 years (range 5–76 years); 91 were women.”
    Quote in the paperNot a substantial claim
  • Findingown data

    All 100 patients with anti-NMDA-receptor encephalitis presented with psychiatric symptoms or memory problems.

    “All patients presented with psychiatric symptoms or memory problems; 76 had seizures, 88 unresponsiveness (decreased conciousness), 86 dyskinesias, 69 autonomic instability, and 66 hypoventilation.”
    Quote in the paperNot a substantial claim
  • Findingown data

    77% of the 92 patients with extensive EEG monitoring had generalised or predominantly frontotemporal slow or disorganised activity (delta-theta) without epileptic discharges.

    “92 patients had extensive EEG monitoring, 77% had generalised or predominantly frontotemporal slow or disorganised activity (delta-theta) without epileptic discharges.”
    Quote in the paperNot a substantial claim
  • May combine two claims. 30
  • Classified as probably not a substantial claim. 8
  • May combine two claims.

    Findingown data

    One boy (11 years old, without tumour) and 21 women and girls were younger than 19 years (median 15 years, range 5-18 years); 12 had an ovarian teratoma (five with immature features), and nine had no tumour.

    “One boy (11 years old, without tumour) and 21 women and girls were younger than 19 years (median 15 years, range 5–18 years); 12 had an ovarian teratoma (five with immature features), and nine had no tumour.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    14 patients had brain biopsy: findings for two were normal, 12 showed mild perivascular lymphocytic cuffing, and ten microglial activation.

    “14 patients had brain biopsy: findings for two were normal, 12 showed mild perivascular lymphocytic cuffng, and ten microglial activation.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    The median time from symptom presentation to initial signs of improvement was 8 weeks (range 2-24 weeks) for the group with early tumour treatment, 11 weeks (4-40 weeks) for the group whose tumour was treated late or not treated, and 10 weeks (2-50 weeks) for the group without tumour (Kruskal-Wallis, p=0.10).

    “The median time from symptom presentation to initial signs of improvement was 8 weeks (range 2–24 weeks) for the group of patients with early tumour treatment, 11 weeks (4–40 weeks) for the group whose tumour was treated late or not treated, and 10 weeks (2–50 weeks) for the group without tumour (Kruskal-Wallis, p=0.10)”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    All brain biopsies had negative results for neuronophagic nodules and viral assays.

    “All had negative results for neuronophagic nodules and viral assays.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    37 patients had cardiac dysrhythmias, including tachycardia or bradycardia, with prolonged pauses in seven patients; four needed pacemakers.

    “37 patients had cardiac dysrhythmias, including tachycardia or bradycardia, with prolonged pauses in seven patients; four needed pacemakers.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    While hospitalised, seven patients had high levels of serum creatine kinase, six developed pulmonary embolism, six transient aphasia, four hemiparesis, and four tetraparesis.

    “While hospitalised, seven patients had high levels of serum creatine kinase, six developed pulmonary embolism, six transient aphasia, four hemiparesis, and four tetraparesis.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    Median follow-up was 17 months (1-194 months): 47 patients had full recovery, 28 mild stable deficits, 18 severe deficits, and seven died as a result of the neurological disorder.

    “Median follow-up was 17 months (1–194 months): 47 patients had full recovery, 28 mild stable deficits, 18 severe deficits, and seven died as a result of the neurological disorder.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    52 patients had dyskinesias, autonomic instability, and hypoventilation, 27 had two of these symptoms, and 14 had just one; the remaining seven developed a milder syndrome of seizures and psychiatric symptoms.

    “52 patients had dyskinesias, autonomic instability, and hypoventilation, 27 patients had two of these symptoms, and 14 had just one; the remaining seven patients developed a milder syndrome of seizures and psychiatric symptoms.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    All teratomas contained nervous tissue; 25 were examined for expression of NMDA receptors, and all were positive.

    “All teratomas contained nervous tissue; 25 were examined for expression of NMDA receptors, and all were positive (data not shown).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Eight patients had bilateral teratomas; four were synchronous, two had history of a contralateral teratoma, and two developed contralateral teratomas before recurrence of the encephalitis.

    “Eight patients had bilateral teratomas; four were synchronous, two had history of a contralateral teratoma, and two developed contralateral teratomas before recurrence of the encephalitis.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    MRI findings were limited to a single area of the brain in 19 patients: 16 had abnormalities in medial temporal lobes, two in the corpus callosum, and one in the brainstem.

    “These findings were limited to a single area of the brain in 19 patients: 16 had abnormalities in medial temporal lobes, two in the corpus callosum, and one in the brainstem.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    Patients who improved had a parallel decrease of serum titres, whereas those who did not improve maintained high titres in CSF and serum.

    “Patients who improved had a parallel decrease of serum titres, whereas those who did not improve maintained high titres in CSF and serum (figure 3).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Relapses were less common in patients with early tumour treatment (1 of 36) than in other patients (14 of 64; p=0.009), including patients whose tumour was treated late (six of 22; p=0.009) and patients without tumour (eight of 42; p=0.03).

    “Relapses were less common in patients with early tumour treatment (1 of 36) than in other patients (14 of 64; p=0.009), including patients whose tumour was treated late (six of 22; p=0.009) and patients without tumour (eight of 42; p=0.03).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Men and children can also be affected by anti-NMDA-receptor encephalitis.

    “Our study indicates that 41% of patients with anti-NMDA-receptor encephalitis do not have a clinically detectable tumour, and that men and children can also be affected.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Four patients who died and whose CSF was available were among the group with the highest titres, whereas the seven patients with milder syndromes had the lowest titres.

    “Four patients who died and whose CSF was available were among the group with the highest titres, whereas the seven patients with milder syndromes had the lowest titres (data not shown).”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    The use of NR1d4-NR2B heteromers abrogated the reactivity of sera or CSF from 92 patients, and substantially decreased the reactivity of the samples of the remaining eight cases.

    “The use of these heteromers abrogated the reactivity of sera or CSF from 92 patients’, and substantially decreased the reactivity of the samples of the remaining eight cases.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    While poorly responsive or in a catatonic-like state, 93 patients developed hypoventilation, autonomic imbalance, or abnormal movements, all overlapping in 52 patients.

    “While poorly responsive or in a catatonic-like state, 93 patients developed hypoventilation, autonomic imbalance, or abnormal movements, all overlapping in 52 patients.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    Antibody reactivity was not modified by changing the NR2 subunit (A, B, C, or D) and was retained by homomers of NR1.

    “Analysis of the reactivity of patients’ sera or CSF against the indicated NMDA-receptor subunits or heteromers showed that antibody reactivity was not modified by changing the NR2 subunit (A, B, C, or D) and was retained by homomers of NR1 (webtable 3).”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    NMDA receptors are heteromers of NR1 subunits that bind glycine and NR2 subunits that bind glutamate.

    “The receptors are heteromers of NR1 subunits that bind glycine and NR2 (A, B, C, or D) subunits that bind glutamate.1”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [1] Lynch, 1994, N-methyl-D-aspartate receptors: different subunit requirements for binding of glutamate antagonists, glycine antagonists, and channel-blocking agents, Mol Pharmacol source

      Not checked in the free run.

  • Classified as probably not a substantial claim.

    Premisecitation

    Preliminary studies suggested the target epitopes were located in extracellular regions of NR1-NR2B NMDA receptors.

    “Preliminary studies suggested the target epitopes were located in extracellular regions of NR1–NR2B NMDA receptors.5”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [5] Dalmau, 2007, Paraneoplastic anti-N-methyl-D-aspartate receptor encephalitis associated with ovarian teratoma, Ann Neurol source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Patients with anti-NMDA-receptor encephalitis often recovered after tumour removal and immunotherapy, suggesting an immune-mediated pathogenesis.

    “Despite the severity of the disorder, patients often recovered after tumour removal and immunotherapy, suggesting an immune-mediated pathogenesis.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [5] Dalmau, 2007, Paraneoplastic anti-N-methyl-D-aspartate receptor encephalitis associated with ovarian teratoma, Ann Neurol source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    NMDA receptors are ligand-gated cation channels with crucial roles in synaptic transmission and plasticity.

    “NMDA receptors are ligand-gated cation channels with crucial roles in synaptic transmission and plasticity.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [1] Lynch, 1994, N-methyl-D-aspartate receptors: different subunit requirements for binding of glutamate antagonists, glycine antagonists, and channel-blocking agents, Mol Pharmacol source

      Not checked in the free run.

  • Classified as probably not a substantial claim. May combine two claims.

    Study design and conductnone given

    All patients had brain MRI, radiological screening for a systemic neoplasm, and serological or CSF studies that ruled out other disorders.

    “All patients had brain MRI, radiological screening for a systemic neoplasm, and serological or CSF studies that ruled out other disorders (webappendix).”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Overactivity of NMDA receptors causing excitotoxicity is a proposed underlying mechanism for epilepsy, dementia, and stroke.

    “Overactivity of NMDA receptors causing excitotoxicity is a proposed underlying mechanism for epilepsy, dementia, and stroke, whereas low activity produces symptoms of schizophrenia.2–4”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites [2] Coyle, 2006, Glutamate and schizophrenia: beyond the dopamine hypothesis, Cell Mol Neurobiol source

      Not checked in the free run.

    • cites [3] Waxman, 2005, N-methyl-D-aspartate receptor subtypes: multiple roles in excitotoxicity and neurological disease, Neuroscientist source

      Not checked in the free run.

    • cites [4] Lau, 2007, NMDA receptor trafficking in synaptic plasticity and neuropsychiatric disorders, Nat Rev Neurosci source

      Not checked in the free run.

  • Classified as probably not a substantial claim. May combine two claims.

    Study design and conductcitation

    Serum and CSF were tested for antibodies against the NMDA receptor and considered positive if three immunohistochemical criteria were fulfilled.

    “Serum and CSF were tested for antibodies against the NMDA receptor,5 and considered positive if three immunohistochemical criteria were fulfilled (figure 1).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [5] Dalmau, 2007, Paraneoplastic anti-N-methyl-D-aspartate receptor encephalitis associated with ovarian teratoma, Ann Neurol source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Low activity of NMDA receptors produces symptoms of schizophrenia.

    “Overactivity of NMDA receptors causing excitotoxicity is a proposed underlying mechanism for epilepsy, dementia, and stroke, whereas low activity produces symptoms of schizophrenia.2–4”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites [2] Coyle, 2006, Glutamate and schizophrenia: beyond the dopamine hypothesis, Cell Mol Neurobiol source

      Not checked in the free run.

    • cites [3] Waxman, 2005, N-methyl-D-aspartate receptor subtypes: multiple roles in excitotoxicity and neurological disease, Neuroscientist source

      Not checked in the free run.

    • cites [4] Lau, 2007, NMDA receptor trafficking in synaptic plasticity and neuropsychiatric disorders, Nat Rev Neurosci source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    The first patients identified with anti-NMDA-receptor encephalitis were young women with ovarian teratoma who presented with psychosis or memory problems, rapidly progressing to multiple neurological deficits requiring prolonged intensive care support.

    “The first patients identified were young women with ovarian teratoma who presented with psychosis or memory problems, rapidly progressing to multiple neurological deficits requiring prolonged intensive care support.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [5] Dalmau, 2007, Paraneoplastic anti-N-methyl-D-aspartate receptor encephalitis associated with ovarian teratoma, Ann Neurol source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Anti-NMDA-receptor encephalitis associates with antibodies against NR1-NR2 heteromers and results in a characteristic neuropsychiatric syndrome.

    “We recently identified a disorder, designated anti-NMDA-receptor encephalitis, that associates with antibodies against NR1–NR2 heteromers and results in a characteristic neuropsychiatric syndrome.5”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [5] Dalmau, 2007, Paraneoplastic anti-N-methyl-D-aspartate receptor encephalitis associated with ovarian teratoma, Ann Neurol source

      Not checked in the free run.

  • Classified as probably not a substantial claim.

    Study design and conductcitation

    Neurological outcome was assessed with the modified Rankin scale (MRS) and mini-mental state examination (MMSE).

    “Neurological outcome was assessed with the modified Rankin scale (MRS)10 and mini-mental state examination (MMSE).11”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [10] van Swieten, 1988, Interobserver agreement for the assessment of handicap in stroke patients, Stroke source

      Not checked in the free run.

    • cites [11] Folstein, 1975, “Mini-mental state”: a practical method for grading the cognitive state of patients for the clinician, J Psychiatr Res source

      Not checked in the free run.

  • May combine two claims.

    Interpretationown data

    The decrease in postsynaptic clusters of NMDA receptors caused by patients' antibodies was reversed by removing the antibodies from the cultures, explaining the potential reversibility of patients' symptoms.

    “The latter effect was reversed by removing the antibodies from the cultures, explaining the potential reversibility of patients’ symptoms.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationown data

    Anti-NMDA-receptor encephalitis represents a new category of immune-mediated disorder that is often paraneoplastic, treatable, and can be diagnosed serologically.

    “Anti-NMDA-receptor encephalitis represents a new category of immune-mediated disorder that is often paraneoplastic, treatable, and can be diagnosed serologically.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationreasoning

    Although the presence of a tumour that expresses NMDA receptors likely contributes to breaking immune tolerance, other unknown immunological triggers seem to be involved in anti-NMDA-receptor encephalitis.

    “Therefore, although the presence of a tumour that expresses NMDA receptors likely contributes to breaking immune tolerance, other unknown immunological triggers seem to be involved.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationown data

    Recovery from anti-NMDA-receptor encephalitis is typically slow, and symptoms may relapse, especially in patients with undetected or recurrent tumours and patients with no associated tumours.

    “Recovery from this disorder is typically slow, and symptoms may relapse, especially in patients with undetected or recurrent tumours and patients with no associated tumours.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationown data

    A pathogenic role of patients' antibodies in anti-NMDA-receptor encephalitis is suggested by the correlation between antibody titres and neurological outcome and by the decrease in number of postsynaptic clusters of NMDA receptors caused by patients' antibodies.

    “A pathogenic role of patients’ antibodies is suggested by the correlation between antibody titres and neurological outcome and by the decrease in number of postsynaptic clusters of NMDA receptors caused by patients’ antibodies.”
    Quote in the paperSubstantial claim
34 of 34
  • The paper relies on this without support.

    The effects of patients’ antibodies on rat hippocampal neuronal cultures reflect the effects of those antibodies on human neurons in anti-NMDA-receptor encephalitis.

    “To assess the effect of patients’ antibodies on neuronal cultures, we first determined the extent of immunolabelling of NR1 (or NMDA receptor) clusters in postsynaptic dendrites.”
  • The paper relies on this without support.

    HEK293 cells ectopically expressing recombinant NR1 or NR1–NR2B subunits present the same epitopes as native NMDA receptors for patients’ antibodies.

    “Antibody titres were measured with ELISA on HEK293 cell lysates ectopically expressing NR1 or NR1–NR2B heteromers (webappendix).”
2 of 2

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Patients usually present with acute behavioral change, psychosis and catatonia that evolve to include seizures, memory deficit, dyskinesias, speech problems, and autonomic and breathing dysregulation.

    “Patients usually present with acute behavioral change, psychosis and catatonia that evolve to include seizures, memory deficit, dyskinesias, speech problems, and autonomic and breathing dysregulation.3”

    From Treatment and prognostic factors for long-term outcome in patients with anti-NMDA receptor encephalitis: an observational cohort study (2013) · cites this paper as [3]

    The Results (page not supplied) report that most patients presented with psychiatric symptoms and later developed seizures, dyskinesias, autonomic instability, and hypoventilation; some also had speech disturbances. The claimed sequence is not fully supported: the paper describes a catatonic-like state developing after decreased consciousness, while some patients had memory loss at presentation. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • If a tumor is found, removal is important because it expedites improvement and decreases relapses.

    “If a tumor is found, removal is important because it expedites improvement and decreases relapses.3, 17”

    From Treatment and prognostic factors for long-term outcome in patients with anti-NMDA receptor encephalitis: an observational cohort study (2013) · cites this paper as [3]

    The Results report fewer relapses after early tumour treatment (1 of 36 versus 14 of 64) and better outcomes when tumours were removed within four months. Initial improvement occurred sooner in the early-treatment group (median 8 versus 11 weeks), but that difference was not statistically significant (p=0.10). The claim overstates the evidence by saying removal itself expedites improvement and decreases relapses; early treatment usually also included immunotherapy. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Samples were considered positive if they fulfilled previously reported criteria including a characteristic pattern of immunostaining of the neuropil of rat brain and specific reactivity with HEK293 cells expressing GluN1 subunits of the NMDAR.

    “Samples were considered positive if they fulfilled previously reported criteria3 including (1) a characteristic pattern of immunostaining of the neuropil of rat brain, and (2) specific reactivity with HEK293 cells expressing GluN1 (also known as NR1) subunits of the NMDAR.”

    From Treatment and prognostic factors for long-term outcome in patients with anti-NMDA receptor encephalitis: an observational cohort study (2013) · cites this paper as [3]

    The Methods (Patients and procedures; page unavailable) say samples were considered positive when three immunohistochemical criteria were met, and describe testing sera and CSF against NR1-expressing HEK293 cells. Our copy does not specify that rat-brain neuropil immunostaining was one of those positivity criteria, so that part of the attributed description remains unsupported. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • The disorder has been recognized in patients of all ages, but more frequently in young adults and children with or without teratoma.

    “The disorder, named “anti-NMDAR encephalitis”, has since been recognized in patients of all ages, but more frequently in young adults and children with or without teratoma.3, 4”
  • Despite the severity of the disease, patients often improve after intensive care support, immunotherapy, and prolonged hospitalizations that require multidisciplinary care.

    “Despite the severity of the disease, patients often improve after intensive care support, immunotherapy, and prolonged hospitalizations that require multidisciplinary care.3, 11”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Tumour-diagnosis intervals conflict in units and range

    Minor

    The maximum interval from neurological symptoms to tumour diagnosis is given as 380 weeks, but six patients diagnosed after recovery are said to have intervals reaching 380 months. Both cannot describe the same diagnosis intervals.

1 of 1

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Authors
Dalmau, J., Gleichman, A. J., Hughes, E. G., Rossi, J. E., Peng, X., Lai, M., Dessain, S. K., Rosenfeld, M. R., Balice-Gordon, R., & Lynch, D. R.
Affiliations
  • University of Pennsylvania (US)
  • Lankenau Institute for Medical Research (US)
  • Children's Hospital of Philadelphia (US)
Corresponding author
Dalmau, Josep
Venue
The Lancet Neurology
Publisher
Elsevier BV
Published
2008-12
Volume
7
Issue
12
Pages
1091-1098
ISSN
1474-4422 (ISSN-L)
OpenAlex
W2146199022
Cited by
3,488
References
35
Citations by year
2026: 117 · 2025: 130 · 2024: 170 · 2023: 140 · 2022: 198 · 2021: 239 · 2020: 233 · 2019: 525 · 2018: 213 · 2017: 207 · 2016: 227 · 2015: 196 · 2014: 182 · 2013: 196 · 2012: 169
FWCI
72.91
Type
journal article
Language
en
Open access
Locations
  • The Lancet Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of Mental Health (F31MH083395, R56MH057683, R01MH057683, R21 MH057683)
  • National Cancer Institute (R01CA089054, R56CA089054, R01CA107192)
Topics
  • Health Sciences › Medicine › Neurology › Autoimmune Neurological Disorders and Treatments
  • Health Sciences › Medicine › Neurology › Peripheral Neuropathies and Disorders
  • Health Sciences › Medicine › Neurology › Myasthenia Gravis and Thymoma
Keywords
anti-NMDA receptor encephalitis, NMDA receptor antibodies, autoimmune encephalitis, ovarian teratoma, psychiatric symptoms, seizures, dyskinesia, autonomic instability, hypoventilation, antibody epitopes, cancer immunotherapy
MeSH terms
Adolescent, Adult, Aged, Animals, Epitopes, Autoantibodies, Autoantigens, Brain, Cell Line, Cells, Cultured, Child, Child, Preschool, Encephalitis, Epilepsy, Female, Humans, Male, Middle Aged, Ovarian Neoplasms, Teratoma, Receptors, N-Methyl-D-Aspartate, Neurocognitive Disorders, Autoimmune Diseases of the Nervous System, Paraneoplastic Syndromes, Nervous System, Protein Subunits, Rats, Young Adult

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