The present invention provides novel Secreted Epithelial Colon Stromal-1 (Secs-1) polypeptides and nucleic acid molecules encoding the same. The invention also provides selective binding agents, vectors, host cells, and methods for producing Secs-1 polypeptides. The invention further provides pharmaceutical compositions and methods for the diagnosis, treatment, amelioration, and/or prevention of diseases, disorders, and conditions associated with Secs-1 polypeptides.