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LCH Risk Organ Classification
Clinical Context & Background
Langerhans Cell Histiocytosis (LCH) is stratified based on the extent of disease (Single System vs. Multisystem) and the involvement of "Risk Organs" (Liver, Spleen, Hematopoietic System). Risk Organ involvement is the most significant prognostic factor for mortality.
Primary Source EvidenceAllen CE, et al. Langerhans-Cell Histiocytosis. N Engl J Med. 2018;379(9):856-868.
Formula Logic
Classification based on organ involvement.Reference Data
| Group | Definition | Prognosis |
|---|---|---|
| Single System (SS-LCH) | One organ/system involved (e.g. Bone, Skin) | Excellent survival |
| Multisystem (MS-LCH) RO- | Multiple systems, No Risk Organs | Very good survival, reactivation common |
| Multisystem (MS-LCH) RO+ | Involvement of Liver, Spleen, or Marrow | Higher mortality risk |
Evidence-based oncology decision support. Verify with clinical guidelines.