Pyroptosis endotypes and malnutrition linked to mortality in older adults with community-acquired pneumoniaHigh inflammation markers linked to higher death risk in older pneumonia patients

Frontiers in Medicine Published April 14, 2026 DOI ↗ Editorial oversight: Dr. Amelia Tan, PhD · Internal Medicine & Chronic Disease

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Key Takeaway

Note that hyper-pyroptosis and malnutrition associate with high mortality in older adults with community-acquired pneumonia.

This retrospective cohort study examined 282 older adults (aged ≥75 years) hospitalized for community-acquired pneumonia. The analysis focused on pyroptosis activation patterns categorized as hyper-pyroptotic, intermediate-pyroptotic, and hypo-pyroptotic endotypes, alongside nutritional status measured by the MNA-SF. These biomarkers were compared against the Pneumonia Severity Index to evaluate their utility in predicting outcomes.

Main results indicated a strong association between pyroptosis endotypes and mortality. Among patients with a hyper-pyroptotic endotype, 28-day all-cause mortality was 57.5% (n=73). In contrast, mortality was 10.2% (n=128) for those with an intermediate-pyroptotic endotype and 1.2% (n=81) for those with a hypo-pyroptotic endotype. Additionally, malnutrition prevalence was notably high in the hyper-pyroptotic group, affecting 48.2% of patients. Biological markers also varied significantly; the median IL-6 level in the hyper-pyroptotic group was 98.4 pg/mL. Risk escalated sharply when GSDMD levels exceeded 3.5 ng/mL.

The study developed an integrated prognostic model that achieved an AUC of 0.898 (95% CI: 0.847–0.943). This performance surpassed the Pneumonia Severity Index, which yielded an AUC of 0.793. The research highlighted nonlinear biomarker-mortality relationships and distinct biological endotypes. No adverse events, serious adverse events, discontinuations, or tolerability issues were reported, as safety data were not applicable to this observational biomarker analysis.

Key limitations include the retrospective design and the lack of reported certainty regarding causality. The findings suggest that pyroptosis patterns may refine risk stratification in this vulnerable population. However, clinical application requires cautious interpretation given the observational nature of the data and the absence of reported funding conflicts or specific practice relevance details.

This study looked at older adults, aged 75 or older, who were hospitalized with community-acquired pneumonia. The researchers examined how different patterns of inflammation, called endotypes, and nutritional status related to death within 28 days. They also compared these findings to a standard severity score used in hospitals.

The results showed a clear difference in survival based on inflammation levels. Patients with a high-inflammination pattern had a 57.5% mortality rate, while those with intermediate levels had 10.2%, and low levels had only 1.2%. A new model combining these markers predicted outcomes better than the standard severity score used in current practice.

The study was a retrospective review of hospital records, meaning it looked back at existing data rather than following patients forward in time. Because the study design is observational, it can show associations but cannot prove that the inflammation patterns directly caused the deaths. Readers should understand that these findings are early and need more research before changing how doctors treat patients.

What this means for you:

High inflammation markers linked to higher death risk in older pneumonia patients; more research needed.

Study Details

Study typeCohort

EvidenceLevel 3

PublishedApr 2026

View Original Abstract ↓

BackgroundDespite their disproportionately high mortality from community-acquired pneumonia (CAP), older adults remain understudied regarding inflammasome-mediated cell death pathways. We sought to determine whether distinct pyroptosis activation patterns exist in this population and how nutritional status modifies their prognostic impact.MethodsThis retrospective cohort study enrolled 282 patients aged ≥75 years hospitalized for CAP. We quantified circulating pyroptosis effectors (gasdermin D [GSDMD], NLRP3, caspase-1) and assessed nutritional status using the Mini Nutritional Assessment-Short Form (MNA-SF). K-means clustering identified biological endotypes; generalized additive models (GAMs) characterized nonlinear biomarker-mortality relationships. The primary endpoint was 28-day all-cause mortality.ResultsThree pyroptosis endotypes emerged with markedly divergent outcomes: hyper-pyroptotic (n=73; mortality 57.5%), intermediate-pyroptotic (n=128; mortality 10.2%), and hypo-pyroptotic (n=81; mortality 1.2%). The hyper-pyroptotic endotype was characterized by severe malnutrition (48.2% with MNA-SF ≤7) and elevated cytokines (median IL-6: 98.4 pg/mL). GAM analysis revealed threshold-dependent, nonlinear relationships—mortality risk escalated sharply when GSDMD exceeded 3.5 ng/mL but showed attenuation at extreme values. Notably, two-dimensional analyses demonstrated supra-additive risk in patients with concurrent nutritional compromise and pyroptosis activation. An integrated prognostic model achieved AUC 0.898 (95% CI: 0.847–0.943), significantly outperforming the Pneumonia Severity Index alone (AUC 0.793; P

Pyroptosis endotypes and malnutrition linked to mortality in older adults with community-acquired pneumoniaHigh inflammation markers linked to higher death risk in older pneumonia patients

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Pyroptosis endotypes and malnutrition linked to mortality in older adults with community-acquired pneumoniaHigh inflammation markers linked to higher death risk in older pneumonia patients

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