Abstract: The present invention relates to the treatment of T-cell acute lymphoblastic leukemia (T-ALLs) by means of immunotherapy with a monoclonal antibody which recognizes the pre-TCR receptor which, due to its presence in all phases of T-ALL pre-TCR+ development, can also be used as a leukemia-initiating cell (LIC) biomarker and as a therapeutic target useful for monitoring minimal residual disease and identifying compounds inhibiting the disease.

Abstract: The present invention provides a novel use and methods comprising antibodies, or antigen-binding fragments thereof, which bind to a CCR7 receptor for use as a novel therapeutic agent in prevention and/or treatment of graft versus host disease (GVHD), preferably in hematopoietic stem cell transplantation (HSCT), more preferably allogeneic hematopoietic stem cell transplantation. GVHD of the invention can be acute (aGVHD) and/or chronic (cGVHD), preferably acute. The antibodies and antigen-binding fragments are capable of selectively depleting ex vivo or in vitro immune cells expressing CCR7 and are capable in vivo of selectively killing immune cells expressing a CCR7 receptor and of impairing/blocking migration and of activation of said immune cells, which are involved in the development and evolution of GVHD.