Abstract: The invention relates to antibodies which bind to RON (receptor d'origine nantais, MST1R) and uses thereof, in particular in the diagnosis and treatment of cancer. Specific antibodies which inhibit RON-mediated pro-survival and tumor proliferation pathways, and variants, fragments, and derivatives thereof are provided. Also provided are specific antibodies which block the ability of the ligand, MSP to bind to RON, as well as fragments, variants and derivatives of such antibodies. The invention also includes polynucleotides encoding the above antibodies or fragments, variants or derivatives thereof, as well as vectors and host cells comprising such polynucleotides. The invention further includes methods of diagnosing and treating cancer using antibodies of the invention.

Abstract: This invention provides antibodies to the prolactin receptor, particularly the human prolactin receptor. Preferred antibodies are capable of blocking prolactin binding to the prolactin receptor, inhibiting signaling through the prolactin receptor, and/or inhibiting proliferation of cancer cells induced by prolactin. Also provided are nucleic acids encoding the antibodies, vectors and host cells comprising the nucleic acids, and uses of the antibodies and nucleic acids.

Abstract: The invention provides Cripto-specific antibodies, or biologically functional fragments thereof, and uses thereof. Antibodies which bind Cripto and inhibit Cripto activity are provided. Antibodies which bind Cripto and inhibit the interaction between Cripto and ALK4 and/or between Cripto and Activin B are provided. Antibodies which bind Cripto and inhibit tumor growth are also provided. Antibodies which bind Cripto, inhibit Cripto activity, and inhibit tumor growth are also provided. The invention also provides methods of using these antibodies in therapeutic, diagnostic, and research applications.