Research Tracker›Biomarker Atlas›Gulf War Illness›sCD26 (soluble DPPIV)

sCD26 (soluble DPPIV) in Gulf War Illness

sCD26 (soluble DPPIV), also described as T cell activation marker, is a inflammatory marker with mixed findings in Gulf War Illness (GWI, Gulf War Syndrome): studies comparing patients with healthy Gulf War veteran controls report both increases and decreases. Symptom domains tied to this marker in the source include immune dysregulation. The finding is drawn from Gean et al. 2021; it describes group-level differences, not a threshold that classifies an individual.

↕ InconsistentInflammatory

Summary

Direction in Gulf War Illness↕ Inconsistent — reported as both higher and lower across studies, with no consistent direction
CategoryInflammatory
Also described asT cell activation marker
Compared againstHGV (healthy Gulf War veteran controls)
Associated symptomsImmune dysregulation
Test typeBlood test (serum / plasma / whole blood)
SourceGean et al. 2021 — doi:10.1016/j.lfs.2021.119456
Condition atlasGulf War Illness Biomarker Atlas

Related Inflammatory markers in Gulf War Illness

Full list: Gulf War Illness Biomarker Atlas.

Frequently asked questions

Is sCD26 (soluble DPPIV) high or low in Gulf War Illness?

Mixed. Some studies report higher and others lower sCD26 (soluble DPPIV) in Gulf War Illness compared with healthy Gulf War veteran controls, so no single direction is established. Source: Gean et al. 2021.

What symptoms is sCD26 (soluble DPPIV) associated with in Gulf War Illness?

The cited literature associates this marker with Immune dysregulation. These are population-level associations and do not mean the marker causes the symptoms.

Which test measures sCD26 (soluble DPPIV)?

It is measured as a blood test (serum / plasma / whole blood). Many of the cited studies used research-grade assays, so clinical availability may vary.

Is one abnormal sCD26 (soluble DPPIV) result diagnostic of Gulf War Illness?

No. No single biomarker is diagnostic of Gulf War Illness. sCD26 (soluble DPPIV) findings come from group comparisons, overlap considerably between patients and controls, and vary with study design, timing and comparison group. A result should be interpreted by a clinician alongside symptoms, history and other tests.

Cite this page

Open Source Medicine Foundation. (2026). sCD26 (soluble DPPIV) in Gulf War Illness: direction, evidence and what it means. OSMF Research Tracker. Retrieved October 7, 2026, from https://research.opensourcemed.info/biomarkers/gulf-war-illness/scd26-soluble-dppiv.html
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Last reviewed: 2026-06-29 · Page generated from gulf-war-illness.json · Browse: Gulf War Illness atlas · Biomarker Index · All marker pages

Disclaimer: This page is an educational synthesis of published, peer-reviewed research and is not medical advice. Biomarker findings vary across studies with case definitions, comparison groups, timing and assay methods. Direction of change reflects the predominant finding in the cited source and does not establish a diagnostic threshold. Discuss any test result with a qualified clinician.