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    • 7. 发明授权
    • Engineering Fc antibody regions to confer effector function
    • 工程化Fc抗体区域以产生效应子功能
    • US08216574B2
    • 2012-07-10
    • US12565911
    • 2009-09-24
    • Jeffrey StavenhagenScott Koenig
    • Jeffrey StavenhagenScott Koenig
    • A61K39/395C07K16/00
    • C07K16/30C07K16/00C07K16/283C07K16/2887C07K16/2896C07K16/32C07K2317/41C07K2317/52C07K2317/72C07K2317/732C07K2317/734C07K2319/30G01N33/574
    • The present invention relates to molecules having a variant Fc region, wherein said variant Fc region comprises at least one amino acid modification relative to a wild-type Fc region. These modified molecules confer an effector function to a molecule, where the parent molecule does not detectably exhibit this effector function. In particular, the molecules of the invention have an increased effector cell function mediated by a FcγR, such as, but not limited to, ADCC. In one embodiment, the variant Fc region binds FcγRIIIA and/or FcγRIIA with a greater affinity, relative to a comparable molecule comprising the wild-type Fc region. The molecules of the invention have particular utility in treatment, prevention or management of a disease or disorder, such as cancer, in a sub-population of patients, wherein the target antigen is expressed at low levels in the target cell population, in particular, in patients refractory to treatment with an existing therapeutic antibody due to the low level of target antigen expression on the cancer or associated cells.
    • 本发明涉及具有变体Fc区的分子,其中所述变体Fc区相对于野生型Fc区包含至少一个氨基酸修饰。 这些修饰的分子赋予分子的效应子功能,其中母体分子不可检测地显示出该效应子功能。 特别地,本发明的分子具有由FcγR介导的增加的效应细胞功能,例如但不限于ADCC。 在一个实施方案中,相对于包含野生型Fc区的可比分子,变体Fc区以更高的亲和力结合FcγRIIIA和/或FcγRIIA。 本发明的分子在患者的亚群中治疗,预防或治疗疾病或病症(例如癌症)具有特别的用途,其中目标抗原在靶细胞群体中以低水平表达,特别是, 在由于癌细胞或相关细胞上的靶抗原表达水平低的现有治疗性抗体治疗难治的患者中。