Use of plasma proteomic and hematological biomarkers represents a promising approach to provide useful diagnostic information for assessment of the severity of hematopoietic acute radiation syndrome. Eighteen baboons were evaluated in a radiation model that underwent total-body and partial-body irradiations at doses of 60Co gamma rays from 2.5 to 15 Gy at dose rates of 6.25 cGy min-1 and 32 cGy min-1. Hematopoietic acute radiation syndrome severity levels determined by an analysis of blood count changes measured up to 60 d after irradiation were used to gauge overall hematopoietic acute radiation syndrome severity classifications. A panel of protein biomarkers was measured on plasma samples collected at 0 to 28 d after exposure using electrochemiluminescence-detection technology. The database was split into two distinct groups (i.e., “calibration,” n = 11; “validation,” n = 7). The calibration database was used in an initial stepwise regression multivariate model-fitting approach followed by down selection of biomarkers for identification of subpanels of hematopoietic acute radiation syndrome-responsive biomarkers for three time windows (i.e., 0–2 d, 2–7 d, 7–28 d). Model 1 (0–2 d) includes log C-reactive protein (p < 0.0001), log interleukin‐13 (p < 0.0054), and procalcitonin (p < 0.0316) biomarkers; model 2 (2–7 d) includes log CD27 (p < 0.0001), log FMS-related tyrosine kinase 3 ligand (p < 0.0001), log serum amyloid A (p < 0.0007), and log interleukin‐6 (p < 0.0002); and model 3 (7–28 d) includes log CD27 (p < 0.0012), log serum amyloid A (p < 0.0002), log erythropoietin (p < 0.0001), and log CD177 (p < 0.0001). The predicted risk of radiation injury categorization values, representing the hematopoietic acute radiation syndrome severity outcome for the three models, produced least squares multiple regression fit confidences of R2 = 0.73, 0.82, and 0.75, respectively. The resultant algorithms support the proof of concept that plasma proteomic biomarkers can supplement clinical signs and symptoms to assess hematopoietic acute radiation syndrome risk severity.
1Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University of the Health Sciences (USUHS), 4555 South Palmer Road, Bldg. 42, Bethesda, MD 20889‐5648;
2Meso Scale Diagnostics, LLC, 1601 Research Blvd., Rockville, MD 20850;
3Bundeswehr Institute of Radiobiology, Neuherbergstrasse 11, 80937 Munich, Germany;
4Effets Biologiques des Rayonnements Département, Institut de Recherche Biomédicale des Armées, 91220 Brétigny sur Orge, France.
The authors declare no conflicts of interest.
For correspondence contact: William F. Blakely, Armed Forces Radiobiology Research Institute, 4555 South Palmer Road, Bldg. 42, Bethesda, MD 20889‐5648, or email at firstname.lastname@example.org.
(Manuscript accepted 7 November 2017)
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