The invention relates to a composition comprising a multivalent antibody comprising a first variable domain that binds a first tumor antigen (TA1), a second variable domain that binds a second tumor antigen (TA2) and a third variable domain that binds an immune cell engaging antigen (IEA); and wherein the composition further comprises a second binding molecule that binds TA1 or TA2. The invention also relates to a kit of parts comprising the multivalent antibody and second binding molecule, and to means and methods for the treatment of cancer comprising administering to the subject in need thereof the multivalent antibody and second binding molecule.

Compositions including an antibody single-chain variable fragment (scFv) conjugate that specifically binds to ROR1 tumor-associated antigen are provided. The anti-ROR1 scFv antibody and conjugates may include a biologically-active molecule. Such conjugates may comprise a chimeric receptor to direct T cells to respond to ROR1 cancer cells, Methods to use the scFV conjugates to target cells expressing ROR1 for therapeutic and diagnostic purposes are also provided.

The invention relates to the field of immunology and biotechnology, and also to the creation of novel effective high-molecular compounds having therapeutic properties. Variants of amino acid sequences of complementarity-determining regions (CDR) of antigen-binding fragments of a protein molecule specific to human cell CD3 receptors are proposed. The proposed CDR can be used for engineering various antigen-binding molecules, one of the essential function of which is a specific interaction with CD3-bearing cells. Bispecific molecules that specifically bind to human cell CD3 and CD19 receptors were engineered by means of the inclusion of said CDR in the composition of an antibody-like molecule intrinsically binding to the CD19 receptor. The proposed CDR can be used for engineering bispecific therapeutic antibodies that are suitable for creating a drug for treating cancer, in particular for treating haematological diseases associated with B-cell malignancies, such as acute lymphoblastic leukemia and B-cell lymphomas, including the refractory and recurrent forms thereof.

The present invention generally relates to T-cells, such as CD8+ T-cells, CD4+ T-cells, CD3+ T-cells, γδ T-cells or natural killer (NK) T-cells, transfected/transduced with a fusion protein which is recruited by the use of trivalent, bispecific antibody molecule which specifically binds to/interacts with the extracellular domain of the fusion protein. More precisely, the present invention relates to a kit comprising the nucleic acid molecules, vectors and/or the fusion proteins of the present invention and the trivalent, bispecific antibody molecules of the present invention. Further aspects of the inventions are expression vectors comprising nucleic acid molecules encoding the fusion proteins as well as the trivalent, bispecific antibody molecules. Further, a process for the production of the trivalent, bispecific antibody molecules of the invention and a medicament/pharmaceutical composition comprising said trivalent, bispecific antibody molecules are described. The invention also provides the use of said trivalent, bispecific antibody molecules in a method for the treatment of particular diseases as well as a pharmaceutical compositions/medicament comprising said trivalent, bispecific antibody molecules, wherein said trivalent, bispecific antibody molecule(s) is (are) to be administered in combination with transduced T-cells comprising the fusion protein of the invention. The invention also provides a method for the treatment of particular diseases.

Provided is a method of purifying a mixture of Fc-containing bioactive peptides by using an affinity column including an affinity matrix containing a protein A ligand, wherein the mixture of Fc-containing bioactive peptides includes a first Fc-containing bioactive peptide and a second Fc-containing bioactive peptide, and the second Fc-containing bioactive peptide includes at least one more human VH3 domain, compared to the first Fc-containing bioactive peptide. According to the purification method, bioactive peptides having the same or similar structures can be precisely separated to the high level of purity while simplification of the process is achieved.

Provided are antibodies that target the cellular efflux pump ABCG2. Also provided are pharmaceutical compositions, nucleic acids, recombinant expression vectors, cells, and kits that include or encode such antibodies. Methods of using the antibodies for detecting presence or absence of ABCG2 expression in cells, e.g., tumor cells, level of ABCG2 expression, and/or inhibiting ABCG2 function are also disclosed. In addition, multi-specific antibodies that bind to ABCG2 and a polypeptide expressed on surface of a cancer cell are provided. The polypeptide may be the efflux pump MDR1 or a cancer-associated antigen. Also provided are methods for treating a subject for a cancer that include administering to the subject an anti-ABCG2 antibody as disclosed herein or a multi-specific antibody that targets both ABCG2 and a cancer-associated antigen or MDR1.

The present invention relates to compositions and methods for using a minibody. Minibodies described herein comprise a secretion signal, a variable heavy chain fragment, a variable light chain fragment, a constant chain fragment, and a hinge domain between the variable light chain fragment and the constant chain fragment. One aspect includes a nucleic acid encoding a minibody. Other aspects include compositions comprising a minibody and a modified T cell comprising a nucleic acid encoding a minibody. Also included are methods and pharmaceutical compositions comprising the modified T cells for adoptive therapy and treating a condition, such as cancer.

Disclosed herein are compositions and methods for increasing the stability of recombinant nanobodies. Also disclosed herein are recombinant nanobodies comprising an IL-2 polypeptide that bind serum albumin and uses thereof for treating cancers.

The present disclosure relates generally to immunoglobulin-related compositions (e.g., antibodies or antigen binding fragments thereof) that can bind to the CD3 protein. The antibodies of the present technology are useful in methods for detecting and treating cancer or a CD3 -associated pathology in a subject in need thereof.

Provided are a protein complex having a high heterodimer formation rate, a method of preparing the same, a pharmaceutical composition for preventing or treating cancer including the protein complex, and a method or preventing or treating cancer using the same. According to the same, bispecific antibodies or antigen-binding fragments with increased stability, receptors and receptor-binding agonists, antagonists, ligands, cytokines or receptor decoy biconjugates may be easily prepared and used in various fields such as disease prevention or treatment, and disease diagnosis.