Antibody variants comprising one or more mutations in the Fc region, particularly anti-CD38 antibodies comprising a mutation in one or more amino acid residues corresponding to E430, E345 and S440 in a human IgG1 heavy chain, wherein the amino acid residues are numbered according to the EU index.在Fc區域包含一或多個突變之抗體變異體、具體言之係抗CD38抗體,其包含在一或多個胺基酸殘基中之突變,該等胺基酸殘基對應在人IgG1重鏈中的E430、E345及S440,其中該等胺基酸殘基係根據EU索引(EU index)來編號。