The present application is directed to an invention based on the discovery that the BLCA-38 antibody is actually an antibody population comprising two distinct monoclonal antibodies. The claims define an isolated antibody population comprising first antibodies and/or antigen binding fragments thereof defined by specific heavy chain and light chain variable regions and wherein the antibody population does not contain second antibodies defined by specific light chain variable regions. The claims also define hybridoma cells, cultures capable of producing such antibody populations, compositions comprising such antibody populations, nucleic acid molecules encoding such antibodies, vectors, host cells thereof, and processes for production of the antibody populations of the invention.