Abstract
The serum-soluble interleukin-2 receptor (sIL-2r) level is considered an important diagnostic test and disease marker in hemophagocytic syndromes/hemophagocytic lymphohistiocytosis (HPS/HLH). However, this cytokine receptor is rarely measured in clinical practice and has been excluded from recent diagnostic/classification criteria such as the HScore and macrophage activation syndrome (MAS) 16. We performed a systematic scoping review of 64 articles (1975–2016) examining the clinical utility of sIL-2r in HPS/HLH. Twenty-two articles describe sIL-2r as a sensitive diagnostic marker for HLH, but only three distinct datasets actually address sensitivity. The original HLH-2004 Guidelines reported sensitivity of 93% and specificity of 100% for sIL-2r ≥ 2400, based on a pediatric dataset (n = 152) which is published for the first time in this review. Two pediatric studies reported sensitivity of 89% for sIL-2r ≥ 2400 in diagnosis of MAS complicating juvenile idiopathic arthritis (JIA) (n = 27) and 88% for secondary HLH in acute liver failure (n = 9). Twenty articles described sIL-2r as a dynamic marker of disease activity that falls with response to treatment, and 15 described high initial sIL-2r levels >10,000 U/mL as a poor prognostic marker. The ability of sIL-2r to distinguish between subtypes of HPS/HLH was inconsistent. This review confirms the importance of soluble IL-2r as a diagnostic and disease marker in HPS/HLH, but also reveals the need for more primary data about its performance characteristics, particularly in adults. More emphasis should be made in including this simple, inexpensive test in clinical practice and studies of HPS/HLH.
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Abbreviations
- FHL:
-
Familial hemophagocytic lymphohistiocytosis
- HLH:
-
Hemophagocytic lymphohistiocytosis
- HPS:
-
Hemophagocytic syndrome (s)
- IAHS:
-
Infection-associated HPS = IAHS
- JIA:
-
Juvenile idiopathic arthritis
- LAHS:
-
Lymphoma-associated hemophagocytic syndrome
- MAS:
-
Macrophage activation syndrome
- MAHS:
-
Malignancy-associated hemophagocytic syndrome
- sIL-2r:
-
Soluble IL-2 receptor
- sILRDC:
-
Soluble IL-2 receptor diagnostic criterion ≥2400 U/mL
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This work was supported by the Hal Kettleson Hematology Research Fund.
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Lin, M., Park, S., Hayden, A. et al. Clinical utility of soluble interleukin-2 receptor in hemophagocytic syndromes: a systematic scoping review. Ann Hematol 96, 1241–1251 (2017). https://doi.org/10.1007/s00277-017-2993-y
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DOI: https://doi.org/10.1007/s00277-017-2993-y