This is an anti-CD25 antibody, in which the alliance from interleucina-2 (IL-2) to CD25 is not restricted by this antibody; this anti-CD25 antibody competes with 7g7b6 and / or MA251 antibody in order to be added to CD25. He also mentioned a specific method of tumor cell reductionReferido un anticuerpo anti-CD25, en donde dicho anticuerpo no inhibe la union de la interleucina-2 (IL-2) a CD25; dicho anticuerpo anti-CD25 compite con el anticuerpo 7G7B6 y/o con el anticuerpo MA251 para unirse al CD25 humano. Tambien se refiere a un metodo para la reduccion celular especifica de tumor.