Disclosed is an antibody or epitope-binding fragment thereof comprising a heavy chain variable region or fragment thereof and a light chain variable region or fragment thereof; wherein said heavy chain variable region or fragment thereof comprises three sequential complementarity-determining regions having amino acids SYNMH, YIYPGNGATNYNQKFQG and GDSVPFAY of SEQ ID NO:11; wherein said light chain variable region or fragment thereof comprises three sequential complementarity-determining regions having amino acids SAHSSVSFMH, STSSLAS, QQRSSFPLT of SEQ ID NO:8; wherein said antibody binds a CA6 glycotope, and wherein the sequences are as defined in the complete specification.