A DNA sequence comprising a nucleic acid encoding an anti-CSAp antibody or an immunoreactive fragment thereof, wherein the anti-CSAP antibody or fragment thereof is a humanized Mu-9 antibody or fragment, wherein the anti-CSAP antibody or immunoreactive fragment thereof comprises the light chain CDR sequences CDR1 (RSSQSIVHSNGNTYLE, SEQ ID NO:1), CDR2 (KVSNRFS, SEQ ID NO:2) and CDR3 (FQGSRVPYT, SEQ