Abstract: The present inventors discovered that antibodies having weaker antigen-binding activity at the early endosomal pH in comparison with that at the pH of plasma are capable of binding to multiple antigen molecules with a single antibody molecule, have long half-lives in plasma, and have improved durations of time in which they can bind to antigen.

Abstract: Problems to be Solved: The present invention provides a simpler and less expensive method for purifying physiologically active proteins, especially antibodies, which can ensure removal of impurities such as DNA contaminants and viruses, and which can minimize a loss of physiologically active proteins. Means for Solving the Problems: A method for removing impurities in a physiologically active protein-containing sample, which comprises the following steps: 1) allowing the physiologically active protein-containing sample to be converted into an aqueous solution of low conductivity at a pH below the isoelectric point of the physiologically active protein; and 2) removing the resulting particles.

Abstract: An antibody subtype (1) which is a subtype of the humanized PM-1 antibody against interleukin-6 receptor (IL-6R) and in which one C-terminal of the heavy chain is Pro-NH2 (447), and an antibody subtype (2) which is a subtype of the humanized PM-1 antibody against interleukin-6 receptor (IL-6R) and in which both C-terminals of the heavy chain are Pro-NH2 (447), and a pharmaceutical composition comprising them.

Abstract: The invention relates to a method for the treatment of a patient with a proliferative disease including solid tumors, hematological malignancies and hyperplasia comprising administering a therapeutic combination to said patient wherein the therapeutic combination comprises a therapeutically effective amount of a compound of formula (I) or a pharmaceutically acceptable salt thereof, and a therapeutically effective amount of a compound of formula (II) or a pharmaceutically acceptable salt thereof.

Abstract: The inventors succeeded in isolating a novel hemopoietin receptor gene (NR10) using a sequence predicted from the extracted motif conserved in the amino acid sequences of known hemopoietin receptors. It was expected that two forms of NR10 exists, a transmembrane type and soluble form. Expression of the former type was detected in tissues containing hematopoietic cells. Thus, NR10 is a novel hemopoietin receptor molecule implicated in the regulation of the immune system and hematopoiesis in vivo. These novel receptors are useful in screening for novel hematopoietic factors capable of functionally binding to the receptor, or developing medicines to treat diseases related with the immune system or hematopoietic system.