Antibody Composition-Producing Cell

An antibody composition comprising antibody molecules, wherein 50% or more of the molecules comprise a Fc region comprising complex N-glycoside-linked sugar chains bound to the Fc region,

• wherein said sugar chains comprise a reduced terminal which contains an N-acetylglucosamine;
• wherein said sugar chains do not contain fucose bound to the 6-position of the N-acetylglucosamine in the reducing terminal of the sugar chains;
• and
• wherein said antibody molecules bind to an antigen expressed by cancer cells, said antigen is CD20.