Disclosed herein are anti-Seizure Related 6 Homolog Like 2 (SEZ6L2) antibodies and antibody dmg conjugates (ADCs), including compositions and methods of using said antibodies and ADCs.

The invention provides methods of preventing and treating graft-versus-host-disease and autoimmune diseases, such as those arising from transplant therapy, by selective depletion of hematopoietic cells through the use of antibody-drug conjugates (ADCs) that specifically bind CD134 or CD278. The compositions and methods described herein can be used to treat a variety of pathologies, including autoimmune diseases, stem cell disorders, and other blood conditions.

It is an object of the present invention to provide an antibody specifically binding to GPR20-positive tumor cells such as GIST, a pharmaceutical product comprising the antibody and having therapeutic effects on a tumor, a method for treating a tumor using the aforementioned pharmaceutical product, and the like. It is another object of the present invention to provide an anti-GPR20 antibody having internalization activity, an antibody-drug conjugate containing the antibody, and the like.

This disclosure provides ASCT2-binding molecules, e.g., anti-ASCT2 antibodies, and antigen-binding fragments thereof. In certain aspects, the ASCT2-binding molecules are conjugated to cytotoxic drugs, e.g., ASCT2 antibody-drug conjugates (ADCs). In certain aspects, the anti-ASCT2 antibodies and fragments thereof can be hybridoma-derived murine monoclonal antibodies, and humanized versions thereof. In certain aspects, the ASCT2-binding molecules bind specifically to cells expressing ASCT2, and in some instances, are internalized into the cells. In addition, this disclosure provides compositions and methods for diagnosing and treating diseases or disorders characterized by ASCT2 overexpression, e.g., certain types of cancer. In a particular embodiment, the disclosure provides methods for treating cancer using ASCT2 ADCs.

The present invention relates to an antigen-binding protein, or an antigen-binding fragment thereof, comprising (i) a heavy chain variable domain comprising a VHCDR1 having the amino acid sequence GYSITSGYSWH; a VHCDR2 having the amino acid sequence YIHYSGSTKYNPSLKS and a VHCDR3 having the amino acid sequence GSNYGFDY; and (ii) a light chain variable domain comprising a VLCDR1 having the amino acid sequence KSSQSLLYSNDQKNYLA, a VLCDR2 having the amino acid sequence WASIRES, and a VLCDR3 having the amino acid sequence QQYYIYPLT. The present invention also relates to an antigen-binding protein, or an antigen-binding fragment thereof, comprising (i) a heavy chain variable domain comprising a VHCDR1 having the amino acid sequence VYSITSGYSWH; a VHCDR2 having the amino acid sequence YIHYSGSTKYNPSLKS, and a VHCDR3 having the amino acid sequence GTDNAVDY; and (ii) a light chain variable domain comprising a VLCDR1 having the amino acid sequence KSSQSLLYSSNQKNYLA, a VLCDR2 having the amino acid sequence WAS SRES, and a VLCDR3 having the amino acid sequence QQYYIYPLT. Compositions comprising the antigen-binding protein, or antigen-binding fragment thereof, methods of use of the antigen-binding protein, or antigen-binding fragment thereof and kits comprising the antigen-binding protein, or antigen-binding fragment thereof are also provided.

Provided is an antibody for treating a cancer, more specifically, an anti-CD43 antibody binding to an extracellular domain of CD43, compositions for treating a cancer or inhibiting a cancer stem cell comprising the antibody as an active ingredient, and methods for screening an agent of inhibiting a cancer stem cell.

The present invention relates to conjugates, in particular antibody-drug conjugates and immunotoxins, having the formula I:
A-(L-D)p(I)
or a pharmaceutically acceptable salts or solvates thereof,
wherein:
A is an antibody that selectively binds FAP;
L is a linker;
D is a drug comprising a cytolysin or a Nigrin-b A-chain; and
p is 1 to 10, and to use of such conjugates in the therapeutic treatment of tumors. Methods of producing such conjugates and components for use in such methods are disclosed.

The invention provides compositions and methods useful for the depletion of cells, such as CD45+, CD135+, CD34+, CD90+, and/or CD110+ cells, and for the treatment of various hematopoietic diseases, metabolic disorders, cancers, and autoimmune diseases, among others. Described herein are antibodies, antigen-binding fragments, ligands, and conjugates thereof that can be applied to effect the treatment of these conditions, for instance, by depleting a population of CD45+, CD135+, CD34+, CD90+, or CD110+ cells in a patient, such as a human. The compositions and methods described herein can be used to treat a disorder directly, for instance, by depleting a population of CD45+, CD135+, CD34+, CD90+, or CD110+ cancer cells or autoimmune cells. The compositions and methods described herein can also be used to prepare a patient for hematopoietic stem cell transplant therapy and to improve the engraftment of hematopoietic stem cell transplants by selectively depleting endogenous hematopoietic stem cells prior to the transplant procedure.

It is an object of the present invention to provide an antibody specifically binding to GPR20-positive tumor cells such as GIST, a pharmaceutical product comprising the antibody and having therapeutic effects on a tumor, a method for treating a tumor using the aforementioned pharmaceutical product, and the like. It is another object of the present invention to provide an anti-GPR20 antibody having internalization activity, an antibody-drug conjugate containing the antibody, and the like.

The present invention relates to antigen-binding proteins, or antigen-binding fragments thereof. In particular, the present invention relates to antigen-binding proteins, or antigen-binding fragments thereof that bind to ERBB2. Compositions comprising a physiologically acceptable carrier and a therapeutically effective amount of the antigen-binding protein, or antigen-binding fragment thereof, use of the antigen-binding protein, or antigen-binding fragment thereof, methods for detecting cancer as well as kits when used in such methods are also provided.