title: Follow-up of the T-cell clonality in Sezary patients treated by extracorporeal photopheresis using a new assay: the immunoscope technique.
abstract: Sezary syndrome is a leukemic form of epidermotropic cutaneous T-cell lymphoma related to the malignant proliferation of clonal CD4+ T-cells. Extracorporeal photochemotherapy (ECP) may induce a transient improvement of the clinical signs but it's efficiency is discussed. In order to investigate the T-cell clonality in the peripheral blood of patients with Sezary syndrome and to monitor its evolution in 8 patients treated by ECP, we used the Immunoscope technique. In one patient, we observed a decrease of the T-cell clonality from 15.6% to 0%, paralleling a complete remission of the clinical disease with a disappearance of the circulating Sezary cells. In the other cases, the evolution of the relative frequency paralleled the clinical status of the patient. In 3 cases, we observed a quick-acting direct cytotoxicity of the association 8MOP + UVA on the T-cell clone present in the cellular product. Immunoscope technique appears to be an efficient assay to appreciate the amount of tumoral cells and monitor the evolution of the clonal component in Sezary syndrome.
authors.affiliation: Institut de recherche sur la peau, INSERM U532, Hôpital, Saint-Louis, Paris 75475, Cedex 10, France. saskia.oro@sls.ap-hop-paris.fr
authors.forename: Saskia
authors.initials: S
authors.lastname: Ingen-Housz-Oro
authors.forename: Annette
authors.initials: A
authors.lastname: Bussel
authors.forename: Béatrice
authors.initials: B
authors.lastname: Flageul
authors.forename: Louis
authors.initials: L
authors.lastname: Dubertret
authors.forename: Laurence
authors.initials: L
authors.lastname: Michel
authors.forename: Gabriel
authors.initials: G
authors.lastname: Gachelin
authors.forename: Philippe
authors.initials: P
authors.lastname: Kourilsky
authors.forename: Hervé
authors.initials: H
authors.lastname: Bachelez
authors.forename: Philippe
authors.initials: P
authors.lastname: Musette
mesh_terms: D000368:Aged; D018791:CD4 Lymphocyte Count; D002999:Clone Cells / Q000276:immunology; D022801:Complementarity Determining Regions / Q000235:genetics; D005260:Female; D005500:Follow-Up Studies; D019674:Genes, T-Cell Receptor beta / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D025202:Molecular Diagnostic Techniques; D018365:Neoplasm, Residual / Q000175:diagnosis; D017893:Photopheresis; D012074:Remission Induction; D017422:Sequence Analysis, DNA / Q000379:methods; D012751:Sezary Syndrome / Q000276:immunology / Q000628:therapy*; D013601:T-Lymphocytes / Q000473:pathology*
chemical_list: D022801:Complementarity Determining Regions