Antibody-endostatin fusion protein and its variants
Methods of inhibiting the growth of tumors comprising administering chimeric fusion molecules comprising endostatin mutants and all or a portion of anti-Her2 or anti-EGFR antibodies.
1. A method comprising the steps of:
a) obtaining a biopsy sample of a tumor from a subject;
b) contacting the biopsy sample with a chimeric fusion molecule comprising an anti-tumor antigen binding domain from an anti-HER2 antibody or anti-EGFR antibody and at least one human endostatin protein or fragment thereof, wherein the at least one human endostatin protein or fragment thereof comprises a proline to alanine amino acid substitution at position 125 of human endostatin, and
(c) detecting vasculogenic mimicry in the biopsy sample.
2. The method of claim 1 , comprising a further step of determining if the tumor cells exhibit vasculogenic mimicry between steps a) and b).
3. The method of claim 1 , further comprising (d) administering the chimeric fusion molecule to the subject.
4. The method of claim 1 , wherein the antigen binding domain specifically binds one or more tumor antigens.
5. The method of claim 1 , wherein the human endostatin protein or fragment thereof comprises one or more NGR motifs (Asn-Gly-Arg) and/or RGD (Arg-Gly-Asp) motifs.
6. The method of claim 5 , wherein the one or more NGR motifs (Asn-Gly-Arg) and RGD (Arg-Gly-Asp) motifs are located at the amino (NH 2 —) terminal, and/or carboxy terminal (COOH—) and/or amino acid positions 93-133 of human endostatin protein or fragment thereof.
7. The method of claim 5 , wherein the one or more NGR motifs (Asn-Gly-Arg) and RGD (Arg-Gly-Asp) motifs are located at amino acid positions 126-128 following the proline or alanine at position 125 of the human endostatin protein or fragment thereof.
8. The method of claim 3 , wherein the chimeric fusion protein is administered to the subject in combination with and/or in separate treatments, with one or more of: cetuximab, sunitinib, sorafenib, celebrex, MTOR inhibitors, AKT inhibitors, P13K inhibitors, bevacizumab (Avastin), signal transduction inhibitors, tamoxifen, toremifen, raloxifene, droloxifene, iodoxyfene, megestrol acetate, anastrozole, letrazole, borazole, exemestane, flutamide, nilutamide, bicalutamide, cyproterone acetate, goserelin acetate, leuprolide, finasteride, herceptin, methotrexate, 5-fluorouracil, cytosine arabinoside, doxorubicin, daunomycin, epirubicin, idarubicin, mitomycin-C, dactinomycin, mithramycin, cisplatin, carboplatin, melphalan, chlorambucil, busulphan, cyclophosphamide, ifosfamide, nitrosoureas, thiotephan, vincristine, taxol, taxotere, etoposide, teniposide, amsacrine, irinotecan, topotecan, an epothilone; a tyrosine kinase inhibitor, Iressa or OSI-774; an angiogenesis inhibitor; an EGF inhibitor; a VEGF inhibitor; a CDK inhibitor; a Her1/2 inhibitor; or monoclonal antibodies directed against growth factor receptors.
9. The method of claim 3 , wherein the chimeric fusion protein is administered to the subject in combination with and/or in separate treatments with one or more antibodies or compounds selected from the group consisting of cetuximab, sunitinib, sorafenib, celebrex, MTOR inhibitors, AKT inhibitors, P13K inhibitors, bevacizumab (Avastin), signal transduction inhibitors, anti-PDL1, anti-CTLA4, anti-EGFR antibodies, and anti-HER2 antibodies.
10. The method of claim 3 , wherein the chimeric fusion protein is administered to the subject in combination with and/or in separate treatments with one or more anti-angiogenic factors selected from the group consisting of sunitinib, sorafenib, and angiostatin.