Twice-Yearly Depemokimab in Severe Asthma with an Eosinophilic Phenotype.
Jackson DJ, Wechsler ME, Jackson DJ, Bernstein D, Korn S, Pfeffer PE, Chen R, Saito J, de Luíz Martinez G, Dymek L, Jacques L, Bird N, Schalkwijk S, Smith D, Howarth P, Pavord ID, SWIFT-1 and SWIFT-2 Investigators, SWIFT-1 Investigators, SWIFT-2 Investigators
- DOI
- 10.1056/NEJMoa2406673
- Record issued
- 2026-08-16
- Engine
- 7.39.0
- Exported
- 2026-09-21
Prepared by Alpha1. This document is confidential: it is intended for the recipient it was shared with and must not be redistributed. The live record at alpha1science.com/verify/9b1d99d1-53b3-46a3-b8d1-f47c94142579 is authoritative.
How this rating was calculated
- ReportingData & code availability partially met−0.25★
- The numeric-impossibility checks (GRIM/GRIMMER/DEBIT/SPRITE) did not run: 32 reported means were read, and their group size is not stated where the values are printed (this source has no machine-readable table structure). These checks need the count the mean was averaged over, so none was performed.
- Declared data/code links were not checked for liveness or content.
This Kaimen Rigor review uses Kaimen Rigor reviewers trained on a curated corpus of high-fidelity and retracted papers, with expert supervision and curation. It can still make mistakes; verify each finding against the source before relying on it.
The paper reports two well-designed, rigorously conducted phase 3 trials with clear scientific rationale, detailed methods, and transparent reporting. The main weakness is the vague data availability statement and minor reporting gaps (statistical software, informed consent, reporting guideline).
Both reviewers classified the study as interventional, and I adopted that. The evaluation covered all eight dimensions; species/strain/housing and cell line sub-criteria were not applicable for this human trial. The statistics verification checked only 4 tests (all consistent); other reported statistics were not machine-verified.
Numerical inconsistencies
None foundValues that contradict each other or are impossible for the stated sample: recomputed p-values and test statistics, GRIM/GRIMMER checks on summary numbers, percentages against their own counts, totals against their parts, and estimates against their own confidence intervals.
Checked — nothing surfaced.
Recomputed 4 tests: 4 consistent, 0 inconsistent; 4 via agent-written checks.
- CONSISTENTreported p < .001 · recomputed p = <.001Reviewers 1, 2Primary endpoint rate ratio in SWIFT-1
“for a rate ratio of 0.42 (95% CI, 0.30 to 0.59) (P<0.001) in SWIFT-1”
Taken as given: The rate ratio is 0.42 with 95% CI 0.30-0.59.; The CI is two-sided at 95%.; The p-value is two-tailed.Method: Recomputed p-value from the reported rate ratio and 95% CI using the normal approximation for the log rate ratio.How we recomputed it: pCI(0.42, 0.30, 0.59, 1) - CONSISTENTreported p < .001 · recomputed p = <.001Reviewers 1, 2Primary endpoint rate ratio in SWIFT-2
“for a rate ratio of 0.52 (95% CI, 0.36 to 0.73) (P<0.001) in SWIFT-2”
Taken as given: The rate ratio is 0.52 with 95% CI 0.36-0.73.; The CI is two-sided at 95%.; The p-value is two-tailed.Method: Recomputed p-value from the reported rate ratio and 95% CI using the normal approximation for the log rate ratio.How we recomputed it: pCI(0.52, 0.36, 0.73, 1) - CONSISTENTreported p = .080 · recomputed p = .079Reviewer 1SGRQ treatment difference in SWIFT-1
“the between-group difference in the change in score (depemokimab minus placebo) was −3.36 (95% CI, −7.11 to 0.39; P = 0.08) in SWIFT-1”
Taken as given: The treatment difference is -3.36 with 95% CI -7.11 to 0.39.; The CI is two-sided at 95%.; The p-value is two-tailed.Method: Recomputed p-value from the reported difference and 95% CI using the normal approximation.How we recomputed it: pCI(-3.36, -7.11, 0.39, 0) - CONSISTENTreported p = .200 · recomputed p = .200Reviewer 1SGRQ treatment difference in SWIFT-2
“and −2.31 (95% CI, −5.84 to 1.23; P = 0.20) in SWIFT-2”
Taken as given: The treatment difference is -2.31 with 95% CI -5.84 to 1.23.; The CI is two-sided at 95%.; The p-value is two-tailed.Method: Recomputed p-value from the reported difference and 95% CI using the normal approximation.How we recomputed it: pCI(-2.31, -5.84, 1.23, 0)
Overstated conclusions
None foundConclusions that reach past what the paper's own results support — including a significance claim that no longer holds when the statistic is recomputed, and efficacy resting on an unvalidated surrogate endpoint.
Checked — nothing surfaced.
4 major claims checked against the paper's own evidence: all adequately supported.
- supportedReviewers 1, 2Depemokimab reduced the annualized rate of exacerbations among patients with severe asthma with an eosinophilic phenotype.The primary endpoint was met in both trials with significant rate ratios and p<0.001.Evidence: Annualized exacerbation rates: SWIFT-1 rate ratio 0.42 (95% CI 0.30-0.59, P<0.001); SWIFT-2 rate ratio 0.52 (95% CI 0.36-0.73, P<0.001).
“Depemokimab reduced the annualized rate of exacerbations among patients with severe asthma with an eosinophilic phenotype.”
ConclusionFind in source - supportedReviewers 1, 2Depemokimab had an acceptable safety profile.Adverse event rates were similar between groups, and no related serious adverse events or deaths were reported.Evidence: Table 3 shows similar AE rates (73% vs 73% in SWIFT-1; 72% vs 78% in SWIFT-2) and no related SAEs.
In the two SWIFT trials, depemokimab had an acceptable safety profile, with a frequency of adverse events that was similar to that in the placebo group.
Discussionreviewer’s wording - supportedReviewers 1, 2Depemokimab enables effective 6-month dosing intervals.The trial used 6-month dosing and demonstrated efficacy, supporting the claim.Evidence: Patients received depemokimab at weeks 0 and 26, and the primary endpoint was met.
Depemokimab is an ultra-long-acting biologic therapy with enhanced binding affinity for interleukin-5, which potentially enables effective 6-month dosing intervals for patients with asthma.
Introductionreviewer’s wording - supportedReviewers 1, 2No significant between-group difference in SGRQ score was observed.The reported p-values (0.08 and 0.20) are not significant, supporting the claim.Evidence: SGRQ treatment differences: -3.36 (95% CI -7.11 to 0.39, P=0.08) in SWIFT-1; -2.31 (95% CI -5.84 to 1.23, P=0.20) in SWIFT-2.
No significant between-group difference in the change from baseline in the SGRQ score was observed in either trial
Resultsreviewer’s wording
Efficacy claim is anchored to an adequate endpoint and a meaningful effect.
- ADEQUATESurrogate endpointThe primary endpoint is the annualized rate of asthma exacerbations, which is a hard clinical outcome (worsening asthma leading to systemic glucocorticoids, hospitalization, or ED visit). This is not a surrogate.
“The primary end point was the annualized rate of exacerbations during a 52-week period. An asthma exacerbation was defined as a worsening of asthma leading to the use of systemic glucocorticoids (or at least a doubling in the dose for ≥3 days in patients who were receiving oral glucocorticoids), hospitalization, or an emergency department visit.”
- ADEQUATEEffect sizeThe effect size is a 42-58% reduction in annualized exacerbation rate, which is clinically meaningful and statistically significant. The rate ratios are 0.42 and 0.52 in the two trials, with narrow confidence intervals and P<0.001.
“the annualized rate of exacerbations was 0.46 ... with depemokimab and 1.11 ... with placebo (rate ratio, 0.42; 95% CI, 0.30 to 0.59; P<0.001) in SWIFT-1 and 0.56 ... with depemokimab and 1.08 ... with placebo (rate ratio, 0.52; 95% CI, 0.36 to 0.73; P<0.001) in SWIFT-2.”
Data authenticity concerns
None foundAn adversarial read for patterns associated with data that may not be genuine: results that look too clean, implausibly large effects, duplicated data or images, and methods that do not match the results reported.
Checked — nothing surfaced.
Reporting gaps
1 finding · worst mediumRequired detail the manuscript never states — study design, biological variables, ethics approval and consent, key resources, statistical reporting, data and code availability, and overall transparency.
- Data/code availability incompleteAssessed
The introduction cites multiple prior studies (references 1-19) establishing the role of IL-5 in eosinophilic asthma, the efficacy of shorter-acting anti-IL-5 biologics, and the phase 1 data for depemokimab. The rationale linking the need for less frequent dosing to improved patient quality of life is logically presented. Limitations of prior therapies (dosing frequency) are acknowledged and addressed by the study design.
Randomization method (RandAll NG, block size six, stratified by ICS dose) and unit (patient) are reported. Blinding is described (trial staff, patients, investigators unaware). Power analysis is referenced but details are in the supplementary appendix. Inclusion/exclusion criteria are detailed. Outlier handling is addressed via the full analysis population definition and exclusion of sites for GCP violations. Controls (placebo) are appropriate. Independent replication is inherent in the two replicate trials.
“Trial staff members, patients, and investigators were unaware of trial-group assignments.”
“Trial staff members, patients, and investigators were unaware of trial-group assignments.”
Table 1 provides detailed baseline demographics: age (mean and distribution), sex, race, asthma duration, inhaled glucocorticoid dose, eosinophil counts, IgE levels, FEV1, and exacerbation history. Sex is reported for both sexes (mixed-sex study, so sex_justified is not applicable). Age and weight are reported. Species/strain/housing are not applicable for a human trial. Demographics are comprehensive.
“Female sex — no. (%) 144 (58) 79 (60) 160 (63) 81 (63)”
“Distribution — no. (%) 12–17 yr 3 (1) 5 (4) 12 (5) 10 (8)”
“Female sex — no. (%) 144 (58) 79 (60) 160 (63) 81 (63)”
“Age Mean 54.1±13.8 53.6±14.9 53.6±16.0 51.2±16.6”
“Peripheral-blood eosinophil count — no. (%) ≥150 cells/μl at screening 224 (90) 123 (93) 219 (87) 118 (92)”
The paper states that the trials were conducted in accordance with the Declaration of Helsinki and ICH-GCP guidelines. It explicitly mentions that the institutional review board or ethics committee at each site approved the trial protocol. Informed consent is implied by the ethical framework but not explicitly stated; however, for a phase 3 trial conducted under ICH-GCP, informed consent is standard and the statement of ethical compliance is sufficient. Regulatory compliance is stated.
“The institutional review board or ethics committee at each site approved the trial protocol (available at NEJM.org) and any other relevant documents.”
“The institutional review board or ethics committee at each site approved the trial protocol (available at NEJM.org) and any other relevant documents.”
Depemokimab is identified as a 100 mg subcutaneous dose administered at weeks 0 and 26, supplied in a prefilled syringe. Placebo is described as matching. The randomization software (RandAll NG) is named. Statistical software is not explicitly named in the main text but is likely detailed in the Supplementary Appendix. Antibodies, cell lines, mycoplasma, and organisms are not applicable for this clinical trial. Reagents are not applicable beyond the investigational product.
“Patients underwent randomization in a 2:1 ratio to receive either depemokimab (at a dose of 100 mg) or placebo subcutaneously at week 0 and week 26, in addition to standard care.”
“The randomization schedule was generated with the use of RandAll NG software”
“Patients underwent randomization in a 2:1 ratio to receive either depemokimab (at a dose of 100 mg) or placebo subcutaneously at week 0 and week 26, in addition to standard care.”
“The randomization schedule was generated with the use of RandAll NG software”
The primary analysis uses a generalized linear model with negative binomial distribution, covariates are listed, and an offset is included. The hierarchical testing procedure is described. Exact p-values are reported for the primary endpoints (P<0.001). Effect sizes with 95% CIs are reported for primary and secondary endpoints. Software is not identified in the main text. Data presentation includes per-group Ns, CIs, and Kaplan-Meier curves. Mathematical plausibility checks: the reported exacerbation counts (120 vs 150 in SWIFT-1, 153 vs 167 in SWIFT-2) are plausible given the rates and person-years.
“Rate ratio (95% CI) 0.42 (0.30 to 0.59)”
The paper states 'A data sharing statement provided by the authors is available with the full text of this article at NEJM.org.' This is a vague statement that does not specify a concrete access route or repository. For a clinical trial, managed access via a platform would be adequate, but the statement here is insufficient. No code sharing is reported. The trial is registered at ClinicalTrials.gov (NCT04719832 and NCT04718103), which provides some transparency.
“A data sharing statement provided by the authors is available with the full text of this article at NEJM.org.”
“A data sharing statement provided by the authors is available with the full text of this article at NEJM.org.”
Methods are detailed enough for replication. The trials are registered at ClinicalTrials.gov with numbers NCT04719832 and NCT04718103. A reporting guideline is not explicitly referenced but NEJM typically requires CONSORT. All pre-specified outcomes are reported, including negative results (SGRQ). Limitations are discussed in the Discussion. Conclusions are proportional to the evidence. Funding (GSK) and conflicts of interest are disclosed.
“SWIFT-1 and SWIFT-2 ClinicalTrials.gov numbers, NCT04719832 and NCT04718103.”
“(Funded by GSK; SWIFT-1 and SWIFT-2 ClinicalTrials.gov numbers, NCT04719832 and NCT04718103.)”
“Supported by GSK. Disclosure forms provided by the authors are available with the full text of this article at NEJM.org.”
Registered (2 IDs: ClinicalTrials.gov). No reporting guideline cited.
Broken references and links
None found · partly checkedReferences checked against Crossref, OpenAlex and Retraction Watch for retractions and resolvability, plus declared data and code links probed for whether they resolve to content matching the paper.
Nothing surfaced — but not everything feeding this category ran (missing: data/code link verification), so read this as a partial clean bill.
Checked 31 references by DOI: 1 verified — 30 no DOI (shown, not verified).
- NO DOICharacterisation of patients with severe asthma in the UK Severe Asthma Registry in the biologic eraNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIDifficult-to-treat and severe asthma in adolescent and adult patients: diagnosis and managementNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIType 2 inflammation in asthma and other airway diseasesNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIComprehensive characterization of difficult-to-treat asthma reveals near absence of T2-low statusNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIInterleukin-5 in the pathophysiology of severe asthmaNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIIL-5 receptor expression in lung fibroblasts: potential role in airway remodeling in asthmaNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIHuman airway epithelial cells express a functional IL-5 receptorNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIMepolizumab targets multiple immune cells in aspirin-exacerbated respiratory diseaseNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIEosinophils and tissue remodeling: relevance to airway diseaseNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIAllergic and eosinophilic asthma in the era of biomarkers and biologics: similarities, differences and misconceptionsNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIMepolizumab and exacerbations of refractory eosinophilic asthmaNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIMepolizumab for prednisone-dependent asthma with sputum eosinophiliaNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIMepolizumab for severe eosinophilic asthma (DREAM): a multicentre, double-blind, placebo-controlled trialNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIMepolizumab treatment in patients with severe eosinophilic asthmaNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIOral glucocorticoid-sparing effect of mepolizumab in eosinophilic asthmaNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIReslizumab for inadequately controlled asthma with elevated blood eosinophil counts: results from two multicentre, parallel, double-blind, randomised, placebo-controlled, phase 3 trialsNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIBenralizumab, an anti-interleukin-5 receptor α monoclonal antibody, as add-on treatment for patients with severe, uncontrolled, eosinophilic asthma (CALIMA): a randomised, double-blind, placebo-controlled phase 3 trialNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIEfficacy and safety of benralizumab for patients with severe asthma uncontrolled with high-dosage inhaled corticosteroids and long-acting β2-agonists (SIROCCO): a randomised, multicentre, placebo-controlled phase 3 trialNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIA phase 1 study of the long-acting anti-IL-5 monoclonal antibody GSK3511294 in patients with asthmaNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIGlobal strategy for asthma management and preventionNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIInterpreting thresholds for a clinically significant change in health status in asthma and COPDNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIMeasurement properties and interpretation of three shortened versions of the asthma control questionnaireNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIGeneral considerations for lung function testingNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIDecreasing patient-reported burden of treatment: a systematic review of quantitative interventional studiesNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIImpact of baseline clinical asthma characteristics on the response to mepolizumab: a post hoc meta-analysis of two phase III trialsNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIEfficacy and safety of mepolizumab in a Chinese population with severe asthma: a phase III, randomised, double-blind, placebo-controlled trialNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIUtility of fractional exhaled nitric oxide suppression as a prediction tool for progression to biologic therapyNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIAsthma exacerbations during the pandemic: time to rethink clinical markersNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOISpirometry services in England post-pandemic and the potential role of AI support software: a qualitative study of challenges and opportunitiesNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
- NO DOIThe relationship between Feno and effectiveness of mepolizumab and benralizumab in severe eosinophilic asthmaNo DOI in the reference — shown for manual review; not independently verifiable (not a fabrication signal).
Copyediting
4 minorWording, consistency and formatting errors that need correcting before submission.
No major wording or formatting errors. 4 minor suggestions below.
4 copyedit issues flagged: mostly typo, consistency, clarity.
- MINORtypoAbstract, Results“0.46 (95% confidence interval [CI]), 0.36 to 0.58)”→ Remove extra parenthesis: '0.46 (95% CI, 0.36 to 0.58)'Extra closing parenthesis after 'CI'.
- MINORtypoResults, Subgroup Analyses“0.58 (95% CI, 0.43 for 0.78)”→ Change 'for' to 'to': '0.58 (95% CI, 0.43 to 0.78)'Typographical error in CI range.
- MINORconsistencyTable 2, footnote for annualized rate of exacerbations leading to hospitalization or ED visit“In line with the statistical analysis plan, the annualized rate of exacerbations leading to hospitalization or an emergency department (ED) visit was not calculated in SWIFT-1 because fewer than 20 such exacerbations occurred.”→ Consider adding a brief note on how the pooled analysis handled the SWIFT-1 data despite the low event count.The footnote explains the omission but could be clearer about the pooled analysis methodology.
- MINORclarityResults, Subgroup Analyses“an annualized rate of 0.58 (95% CI, 0.43 for 0.78) in the depemokimab group”→ Change 'for' to 'to' for consistency with other CI presentations.Typographical error: '0.43 for 0.78' should be '0.43 to 0.78'.
The published work is robust and methodologically sound. An informed reader should weigh the minor reporting gaps (data availability, statistical software, informed consent) as transparency issues, not validity threats. No erratum is warranted based on the verified statistics or citation checks.
- 1.HIGHdata codeReplace the vague data sharing statement in the main text with a concrete description of the access mechanism (e.g., via GSK's data sharing portal or Vivli) and conditions.The current statement does not specify how readers can access the data, which is a transparency gap for a data-driven clinical trial.
- 2.HIGHstatisticsName the statistical software and version (e.g., SAS 9.4) in the Statistical Analysis section.Reproducibility requires knowing the software used for analysis; the paper only names the randomization software.
- 3.MEDIUMethicsAdd an explicit statement that informed consent was obtained from all participants (or describe a waiver) in the Ethics section.Informed consent is a standard ethical requirement and its absence from the main text is a minor reporting gap.
- 4.MEDIUMreportingExplicitly state adherence to the CONSORT reporting guideline in the Methods section.Referencing the reporting guideline improves transparency and reader confidence in the trial reporting.
- 5.MEDIUMstatisticsProvide the sample-size calculation details (effect size, alpha, power) in the main text or ensure they are clearly presented in the Supplementary Appendix.The main text only references the supplementary appendix; key parameters should be accessible to readers.
- 6.MEDIUMstatisticsClarify how outliers were handled in the statistical analysis (e.g., sensitivity analyses excluding extreme values).The analysis population definition addresses data integrity, but explicit outlier handling is not described.
- 7.LOWcopyeditFix the extra parenthesis in the Abstract: change '0.46 (95% confidence interval [CI]), 0.36 to 0.58)' to '0.46 (95% CI, 0.36 to 0.58)'.Typographical error in the abstract could confuse readers.
- 8.LOWcopyeditFix the typo in the Results, Subgroup Analyses: change '0.58 (95% CI, 0.43 for 0.78)' to '0.58 (95% CI, 0.43 to 0.78)'.Incorrect preposition in the CI range is a typographical error.
- 9.LOWcopyeditClarify the Table 2 footnote about the pooled analysis handling of SWIFT-1's low event count for hospitalization/ED exacerbations.The footnote explains the omission but could be clearer about the pooled analysis methodology.
The star rating is the report’s one-glance summary. Every paper starts at 5★ and loses stars for the concrete problems the review finds — so a rating is never a vague average, it’s a running total you can read line by line under “How this rating was calculated.”
- Reporting — 8 dimensionseach dimension that fully fails−½★
- each dimension partially met−¼★
- Statistics · Integrity · Claimseach serious problem−1★
- each medium problem−½★
- Citationseach retracted or unverifiable reference−¼★
- Copyeditonly when the manuscript needs a full edit−½★
The rating never drops below 1★, and a demonstrable critical failure (an impossible statistic, a proven ethics violation) caps it at 1★ on its own — so the stars can never look healthy when the verdict is CRITICAL.
The rating draws on a panel of agents. Three independent Kaimen Rigor reviewers grade the eight dimensions below across several independent passes (the shown verdict is their majority vote — steadier than any single run), isolate the paper’s major claims and check its own evidence backs them, and flag integrity concerns. Alongside them, a citation agent resolves every reference against Crossref, OpenAlex, and Retraction Watch; a statistics agent recomputes reported tests; and rule-based checks verify that declared data/code links actually resolve. Full text is required — an abstract-only submission is not analyzed.
Graded against NIH, MDAR, ARRIVE 2.0, CONSORT, EQUATOR, and RRID guidelines. A dimension that doesn’t apply to the study type is skipped, never penalized.
This Kaimen Rigor review is model-assisted and is not a substitute for formal expert review. It complements human evaluation by surfacing potential methodological concerns — verify each finding against the source.