Abstract: Provided herein are antagonists or binding agents of an abnormal vasopressin receptor V2 (e.g., AbnV2), such as antibodies and antigen-binding portions thereof specific for the receptor, for identifying and targeting cancer cells expressing such abnormal vasopressin receptor V2. Additionally provided are methods of using said antagonists or binding agents, for example, to image cancer cells or in biological samples, or diagnose cancers, both in vivo and in vitro. The antagonists or binding agents may also be used for treating patients suffering from a cancer expressing the abnormal vasopressin receptor V2, such as small cell lung cancer (SCLC), breast cancer, or ovarian cancer.

Abstract: Provided herein are pro-VP antagonists, such as antibodies and antigen-binding portions thereof specific for pro-VP, for identifying and targeting expressing cancer cells. Applicants additionally provide methods of using said compositions, for example to image cancer cells in vivo and in biological samples. The compositions may also be used for treating patients suffering from a provasopressin-expressing cancer. Provasopressin-expressing cancers include neuroendocrine cancer, pancreatic cancer, and prostate cancer.

Abstract: Provided herein are pro-VP antagonists, such as antibodies and antigen-binding portions thereof specific for pro-VP, for identifying and targeting expressing cancer cells. Applicants additionally provide methods of using said compositions, for example to image cancer cells in vivo and in biological samples. The compositions may also be used for treating patients suffering from a provasopressin-expressing cancer. Provasopressin-expressing cancers include neuroendocrine cancer, pancreatic cancer, and prostate cancer.

Abstract: Provided herein are antagonists or binding agents of an abnormal vasopressin receptor V2 (e.g., AbnV2), such as antibodies and antigen-binding portions thereof specific for the receptor, for identifying and targeting cancer cells expressing such abnormal vasopressin receptor V2. Additionally provided are methods of using said antagonists or binding agents, for example, to image cancer cells or in biological samples, or diagnose cancers, both in vivo and in vitro. The antagonists or binding agents may also be used for treating patients suffering from a cancer expressing the abnormal vasopressin receptor V2, such as small cell lung cancer (SCLC), breast cancer, or ovarian cancer.

Abstract: The present invention discloses antibodies, antigen binding fragments, peptides and peptidomimetics immunoreactive with provasopressin and compositions thereof, methods of phenotyping tissue samples, methods of treating cancer, and kits for phenotyping test biopsy samples and bodily fluids for breast cancer, small cell lung cancer, ductal carcinoma in situ, and atypical ductal hyperplasia.