Described herein are antibody constructs comprising a 41-1BB binding domain and an antigen-binding domain that binds to a tumor-associated antigen (TAA), wherein the 4-1BB-binding domain and the TAA antigen-binding domain are linked directly or indirectly to a scaffold. The scaffold may be an Fc construct with modifications that reduce its ability to mediate effector function.

The present invention is intended to provide: an anti-hCDCP1 antibody, which can be used as an active ingredient of anticancer agents having few side effects, etc.; and the aforementioned anti-hCDCP1 antibody that is formulated into ADC. Specifically, the present invention relates to an antibody that binds to human CDCP1 (CUB domain-containing protein 1), which has low binding property to human CD34-positive cells, or an antigen-binding fragment thereof. A representative example of the present antibody may be an antibody having heavy chain CDR1 comprising the amino acid sequence as set forth in SEQ ID NO: 25, heavy chain CDR2 comprising the amino acid sequence as set forth in SEQ ID NO: 26, heavy chain CDR3 comprising the amino acid sequence as set forth in SEQ ID NO: 27, light chain CDR1 comprising the amino acid sequence as set forth in SEQ ID NO: 29, light chain CDR2 comprising the amino acid sequence as set forth in SEQ ID NO: 30, and light chain CDR3 comprising the amino acid sequence as set forth in SEQ ID NO: 31.

Antibodies are engineered by replacing one or more amino acids of a parent antibody with non cross-linked, highly reactive cysteine amino acids. Antibody fragments may also be engineered with one or more cysteine amino acids to form cysteine engineered antibody fragments (ThioFab). Methods of design, preparation, screening, and selection of the cysteine engineered antibodies are provided. Cysteine engineered antibodies (Ab), optionally with an albumin-binding peptide (ABP) sequence, are conjugated with one or more drug moieties (D) through a linker (L) to form cysteine engineered antibody-drug conjugates having Formula I:

Ab-(L-D).sub.p  I

where p is 1 to 4. Diagnostic and therapeutic uses for cysteine engineered antibody drug compounds and compositions are disclosed.

The present disclosure relates to constructs, such as antibody molecules comprising a binding domain specific to CD45, said binding domain comprising SEQ ID NO: 1, 2, 3 and/or SEQ ID NO: 4, 5 and 6. The disclosure also extends to pharmaceutical compositions comprising said constructs and use of the constructs/compositions in treatment.

The present invention relates to a multispecific antibody comprising at least one domain specifically binding to a tumor-associated immune checkpoint antigen with low affinity, and at least one domain specifically binding to a tumor-associated antigen (TAA), and pharmaceutical compositions and methods of use thereof. The present invention further relates to a nucleic acid encoding said multispecific antibody, a vector comprising said nucleic acid, a host cell comprising said nucleic acid or said vector, and method of producing said multispecific antibody

This disclosure belongs to the field of biomedical technology, and particularly refers to a trifunctional molecule and the application thereof. The structure of the trifunctional molecule includes a first functional domain, a second functional domain and a third functional domain. These domains are capable of simultaneously binding to CD19, CD3, and T cell positive (negative) costimulatory factors, thereby producing the first and second signal required for T cell activation. The trifunctional molecule is a recombinant protein peptide chain, which can be produced by a eukaryotic cell expression system. The product has a single structure, simple purification process, high protein yield, and preparation process and product stability. The trifunctional molecule is superior to the anti-CD19/anti-CD3 BiTE bispecific antibody in killing CD19-positive target cells. Compared with the CAR-T technology targeting CD19, the trifunctional molecule is more convenient to use, the dose is controllable, and the side effects of CAR-T are avoided.

The present disclosure provides a downstream manufacturing method for the production of bispecific antigen-binding molecule products, which comprise at least two different binding domains. The process comprises at least one filtration step, wherein the filtration is ultrafiltration/diafiltration (UF/DF), and/or viral filtration (VF), wherein a β-cyclodextrin is applied in the process either in a buffer applied in the filtration step or added to the filtration pool after the UF/DF filtration step wherein the buffer or the pool have a concentration of about 0.1 to 3% (m/v) of a (3-cyclodextrin, to preferably keep the product in a non-aggregated form.

Provided is an anti-CLL1 antibody and an application thereof. The variable region of the anti-CLL1 antibody includes the CDRs of SEQ ID NO: 1 to 6, SEQ ID NO: 5, and SEQ ID NO: 7 to 11 or SEQ ID NO: 12 to 17. The anti-CLL1 antibody of the present application has significant binding ability to both free and cell surface CLL1. After humanization, the affinity of the antibody to CLL1 is further improved, and it has important application prospect in the clinical diagnosis and/or treatment of tumors.

The present invention is directed to novel PD-1-targeted IL-15/Rα-Fc fusion proteins comprising an IL-15/IL-15Rα Fc-fusion protein and a PD-1 antigen binding domain. The PD-1-targeted IL-15/Rα-Fc fusion proteins can be administered to a patient to treat cancer.

The present invention relates to anti-human OX40L antibodies, new medical uses and methods.