The present invention provides and includes monoclonal antibodies (MoAbs or mAbs) specific or preferentially selective for PCBP-1 antigens, hybridoma lines that secrete these PCBP-1 antibodies or antibody fragments, and the use of such antibodies and antibody fragments to detect PCBP-1 antigens, particularly those expressed by cancer cells. The present invention also includes antibodies that are specific for or show preferential binding to a soluble form of PCBP-1. The present invention further includes chimeric and humanized antibodies, processes for producing monoclonal, chimeric, and humanized antibodies using recombinant DNA technology, and their therapeutic uses, particularly in the treatment of cancer. The present invention further includes methods and kits for the immunodetection and immunotherapy of cells for samples which express PCBP-1 antigens.