Method for ex-vivo purging in autologous transplantation

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 5/16 (2006.01)

Patent

CA 2582216

The present invention concerns a new method for ex-vivo purging of cells in autologous transplantation, wherein the sample of taken cells is treated with a sufficient amount of a multimeric form of the soluble portion of FasL to kill malignant cells without substantially affecting viability of cells to be transplanted. Autologous stem cell transplantation (ASCT) following high-dose chemotherapy with or without radiotherapy has become the standard therapy for the majority of patients with large-cell lymphomas, multiple myeloma, and refractory/recidivating Hodgkin's disease. Such therapy is nowadays also contemplated for selected patients with low-grade lymphomas (chronic lymphocytic leukemia, follicular lymphoma, mantle cell lymphoma) and for patients with acute myeloid leukemia (AML). Current treatments for cell purging include chemotherapy and antibody cocktails. These treatments are often toxic on stem cells and not efficient in eliminating cancer cells. Thus, there is an unmet medical need for cell purging in ASCT which this project will address.

L'invention concerne un nouveau procédé de purge ex vivo de cellules en autogreffe, l'échantillon de cellules prélevées étant traité avec une quantité suffisante d'une forme multimère de la partie soluble de FasL pour tuer les cellules malignes sans sensiblement affecter la viabilité des cellules à greffer. L'autogreffe de cellules (ASCT) suivant une chimiothérapie à haute dose avec ou sans radiothérapie est devenue une thérapie courante pour la majorité des patients qui souffrent de lymphomes à grandes cellules, de myélome multiple, ou de la maladie de Hodgkin réfractaire/ récidivante. Cette thérapie est aujourd'hui également appliquée à certains patients qui souffrent de lymphomes de faible intensité (leucémie lymphoïde chronique, lymphome folliculaire, lymphome à cellules du manteau) ou de leucémie myéloïde aiguë (LMA). Les traitements actuels de purge de cellules incluent à la fois une chimiothérapie et un cocktail d'anticorps. Ces traitements sont souvent toxiques pour les cellules souches et s'avèrent inefficaces dans l'élimination des cellules cancéreuses. L'invention est destinée à combler le besoin médical en technique de purge de cellules lors des ASCT.

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