The present invention relates to a pharmaceutical composition comprising as active substance, at least one compound comprising, or consisting of, a polypeptide which comprises, or consists of, at least 11 contiguous amino acids selected from X1-S-D-I-F-X2-G-E-P-X3-L-X4-P-X5-X6-X7-X8-X9-Q-L (SEQ ID NO: 13).La présente invention concerne une composition pharmaceutique contenant en tant que principe actif au moins un composé comprenant, ou consistant en, un polypeptide qui comprend, ou consiste en, au moins 11 acides aminés contigus choisis parmi X1-S-D-I-F- X2-G-E-P-X3-L-X4-P-X5-X6-X7-X8-X9-Q-L (SEQ ID NO: 13).