申请人:Immunomedics, Inc.
公开号:US20150344573A1
公开(公告)日:2015-12-03
Disclosed are humanized RFB4 antibodies or antigen-binding fragments thereof. therapy of B-cell associated diseases, such as B-cell malignancies, autoimmune disease and immune dysfunction disease. Preferably, hRFB4 comprises the light and heavy chain RFB4 CDR sequences with human antibody FR and constant region sequences, along with heavy chain framework region (FR) amino acid residues Q1, F27, V48, A49, F68, R98, T117 and light chain residues L4, S22, K39, G100, V104, and K107. More preferably, the heavy and light chain variable region sequences of hRFB4 comprise SEQ ID NO:7 and SEQ ID NO:8, respectively. In certain embodiments, trogocytosis (antigen shaving) induced by hRFB4 plays a significant role in determining antibody efficacy and disease responsiveness for treatment of B-cell diseases, such as hematopoietic cancers, immune system dysfunction and/or autoimmune disease.
本发明涉及人源化的RFB4抗体或其抗原结合片段,用于治疗B细胞相关疾病,如B细胞恶性肿瘤、自身免疫疾病和免疫功能障碍疾病。最好的情况是,hRFB4包括人源抗体FR和常数区序列的轻重链RFB4 CDR序列,以及重链框架区(FR)氨基酸残基Q1、F27、V48、A49、F68、R98、T117和轻链残基L4、S22、K39、G100、V104和K107。更好的是,hRFB4的重链和轻链可变区序列分别包括SEQ ID NO:7和SEQ ID NO:8。在某些实施例中,hRFB4诱导的胞间贡献(抗原剃须)在决定治疗B细胞疾病(如造血系统癌症、免疫系统功能障碍和/或自身免疫疾病)的抗体疗效和疾病响应性方面发挥重要作用。