Background The lesions of Langerhans'-cell histiocytosis (histiocytosisX), a proliferative histiocytic disorder of unknown cause, containhistiocytes similar in phenotype to dendritic Langerhans' cells.The disease ranges in severity from a fatal leukemia-like disorderto an isolated lytic lesion of bone. Intermediate forms of thedisease are usually characterized by multiorgan involvement,diabetes insipidus, and a chronic course.
Methods To determine whether Langerhans' histiocytosis is apolyclonal reactive disease or a clonal disorder, we used X-linkedpolymorphic DNA probes (HUMARA, PGK, M27[DXS255], and HPRT)to assess clonality in lesional tissues and control leukocytesfrom 10 female patients with various forms of the disease. Lymphoidclonality was also assessed by analysis of rearrangements atimmunoglobulin and T-cell-receptor gene loci.
Results The HUMARA assay detected clonal cells in the lesionsof 9 of the 10 patients: 3 patients had acute disseminated disease,3 had unifocal disease, and 3 had intermediate forms. The percentageof clonal cells closely approximated the percentage of CD1a-positivehistiocytes in each lesion. Clonality was also confirmed intwo of nine cases with the PGK or M27 probe. Extreme constitutionallyonization precluded assessment of clonality in the 10th case.Lymphoid clonality was ruled out in all cases.
Conclusions The detection of clonal histiocytes in all formsof Langerhans'-cell histiocytosis indicates that this diseaseis probably a clonal neoplastic disorder with highly variablebiologic behavior. Thus, genetic mutations that promote clonalexpansion of Langerhans' cells or their precursors may now beidentified.
Source Information
From the Departments of Pathology and Pediatrics, the Center for Molecular and Cellular Diagnostics, and the Cancer Center, University of New Mexico School of Medicine, Albuquerque (C.L.W., B.B.G., M.H.D.); the Division of Hematology-Oncology, Brigham and Women's Hospital, Harvard Medical School, Boston (L.B., D.G.G.); the Department of Pathology and Laboratory Medicine, All Children's Hospital, St. Petersburg, Fla. (B.E.F.); and the Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston (K.L.M.)
Address reprint requests to Dr. Willman at the University of New Mexico Cancer Center, 900 Camino de Salud, N.E., Albuquerque, NM 87131.
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