The present invention is directed to a combination therapy involving a type I anti-CD20 antibody and a type II anti-CD20 antibody for the treatment of a patient suffering from cancer, particularly a CD20-expressing cancer. An aspect of the invention is a composition comprising a type I anti-CD20 antibody and a type II anti-CD20 antibody. Another aspect of the invention is a kit comprising a type I anti-CD20 antibody and a type II anti-CD20 antibody. Yet another aspect of the invention is a method for the treatment of a patient suffering from cancer comprising co-administering, to a patient in need of such treatment, a type I anti-CD20 antibody and a type II anti-CD20 antibody.본 출원은 암, 특히 CD20 발현 암의 치료를 위한 유형 I 및 유형 II 항-CD20 항체의 병용 치료요법에 관한 것이다.