The present invention provides novel polypeptides, termed FCTRX polypeptides, as well as polynucleotides encoding FCTRX polypeptides and antibodies that immunospecifically bind to an FCTRX or a derivative, variant, mutant, or fragment of an FCTRX polypeptide, polynucleotide or antibody. The invention additionally provides methods in which the FCTRX polypeptide, polynucleotide and antibody are used in detection and treatment of a broad range of pathological states, as well as to other uses.