Use of LRIG1 as a biomarker for identifying a subject for application of anti-c-Met antibodies
A method of identifying a cell sample or subject suitable for treatment with an anti-c-Met antibody or antigen-binding fragment thereof that specifically binds to an epitope within a SEMA domain of a c-Met protein by determining the presence of LRIG1 in a cell sample from the subject, as well as related methods and compositions.
1. A method of identifying a subject suitable for treatment with an anti-c-Met antibody or antigen-binding fragment thereof that specifically binds to an epitope within a SEMA domain of a c-Met protein, comprising:
(1) determining the presence of LRIG1 in a cell sample from the subject so as to allow LRIG1-mediated c-Met degradation;
(2) determining that the subject is suitable for treatment with the anti-c-Met antibody or antigen-binding fragment thereof when LRIG1 is present in the cell sample; and
(3) administering the anti-c-Met antibody or antigen-binding fragment thereof to the subject determined to be suitable for treatment, wherein the anti-c-Met antibody or antigen-binding fragment thereof comprises SEQ ID NOs: 1-3, 10, 11, and 13, specifically binds to an epitope having 5 to 19 consecutive amino acids of SEQ ID NO: 71 that includes the amino sequence of SEQ ID NO: 73 (EEPSQ) and promotes LRIG1-mediated c-Met degradation.
2. The method of claim 1 , wherein the presence of LRIG1 in the cell sample is determined by a method selected from the group of immunochromatography, enzyme linked immunosorbent assay (ELISA), radioimmunoassay (RIA), enzyme immunoassay (EIA), florescence immunoassay (FIA), luminescence immunoassay (LIA), western blotting, or immunohistochemical staining using an anti-LRIG1 antibody.
3. The method of claim 1 , further comprising determining a Cbl concentration, a Cbl mutation, or a mutation of a site of c-Met for interaction with Cbl in the cell sample.
4. The method of claim 3 , further comprising determining the subject to be suitable for treatment with the anti-c-Met antibody or antigen-binding fragment thereof when Cbl is present at a low level or absent in the cell sample or a mutation is present on either or both Cbl and the site of c-Met for interaction with Cbl.
5. The method of claim 4 , further comprising determining the subject to be suitable for treatment with the anti-c-Met antibody or antigen-binding fragment thereof when Cbl is absent or present at a low level in the cell sample or a mutation is present on either or both Cbl and the site of c-Met for interaction with Cbl, and LRIG1 is present in the cell sample.
6. The method of claim 5 , wherein Cbl concentration is determined by immunohistochemical staining using an anti-Cbl antibody, which indicates that Cbl is absent or present at a low level in the cell sample.
7. The method of claim 3 , wherein the Cbl mutation is a deletion or substitution of 51 or more consecutive nucleotides within nucleotides from 1169 th to -1414 th positions of the nucleotide sequence of GenBank Accession Number NM 005188 (SEQ ID NO: 112), or a deletion or substitution of 17 or more consecutive amino acids within nucleotides from 343 rd to 424 th positions of the amino acid sequence of GenBank Accession Number NP 005179 (SEQ ID NO: 113).
8. The method of claim 3 , wherein the mutation of a site of c-Met (SEQ ID NO: 114) for interaction with Cbl is a deletion or a substitution of tyrosine at position 1003 (Y1003) with an amino acid other than tyrosine, or a deletion or a substitution of 141 or more consecutive nucleotides within exon 14 of the c-Met gene with other nucleotides, or a deletion or a substitution of 46 or more consecutive amino acids within a polypeptide encoded by exon 14 of the c-Met gene with other amino acids.
9. The method of claim 1 , wherein the anti-c-Met antibody or antigen-binding fragment thereof heavy chain variable region comprises SEQ ID NO: 17 and the light chain variable region comprises SEQ ID NO: 111.
10. The method of claim 1 , wherein the anti-c-Met antibody or antigen-binding fragment thereof comprises
a heavy chain comprising the amino acid residues from the 18 th to 460 th positions of SEQ ID NO: 66 and a light chain comprising the amino acid residues from the 21 st to 240 th positions of SEQ ID NO: 68.
11. The method of claim 1 , wherein the anti-c-Met antibody or antigen-binding fragment thereof is an antibody of mouse origin, a mouse-human chimeric antibody, a humanized antibody, or a human antibody.
12. The method of claim 1 , wherein the anti-c-Met antibody or antigen-binding fragment thereof is an antigen-binding fragment selected from the group consisting of scFv, (scFv) 2 , Fab, Fab', and F(ab') 2 of the anti-c-Met antibody.
13. The method of claim 1 , wherein the cell sample is a sample of cancer cells.