Sandbox: Langerhans

• The table below lists prognostic factors for Langerhans cell histiocytosis patients:

Prognostic Factor	Description
Age	Older age at the time of diagnosis is associated with a worse prognosis.
Gender	Males are associated with a worse prognosis when compared to females.
Performance status	Patient's poor performance status is associated with a worse prognosis.
Stage	Binet stages B and C or Rai stages 2-4 are associated with a worse prognosis.
Lymphocyte doubling time	A rapid lymphocyte doubling time is associated with a worse prognosis.
Genetic mutations	Deletion of chromosome 17 short arm and chromosome 11 long arm are associated with a worse prognosis.
Prolymphocytes percent	An increased percentage of prolymphocytes is associated with a worse prongnosis.
Histological analysis	Diffuse histology on bone marrow aspiration is associated with a worse prognosis.
Lactate dehydrogenase (LDH) level	Elevated level of LDH is associated with a worse prognosis.
β2-microglobulin level	Elevated level of β2-microglobulin level is associated with a worse prognosis.
Lymphocyte surface markers	Over expression of CD38 is associated with a worse prognosis.
Immunoglobulin (Ig)VH gene	The absence of IgVH gene mutation is associated with a worse prognosis.
Membrane-bound proteins	The expression of zeta-chain-associated protein kinase 70 (ZAP) is associated with a worse prognosis.