Methods and compounds for inhibiting the growth of neoplastic cells.

Polypeptide having at least 80% identity of the amino acid sequence relative to the total length of: (i) the amino acid sequence of residues 1 or X to 282 shown in Figure 12 (SEQ ID NO: 25), wherein X is any amino acid residue from 26 to 35; (Ii) the amino acid sequence of residues 1 or X to Y shown in Figure 12 (SEQ ID NO: 25), wherein X is any amino acid residue from 26 to 35 and Y is any amino acid residue 226 235; or (iii) the amino acid sequence encoded by the coding sequence in full length DNA deposited under ATCC accession number 209263, for use in a method for treating tumor in a mammal.