Disclosed is an isolated antibody, or a functional Fragment of same, capable of inhibiting the proliferation of tumor cells in vitro and/or in vivo, characterized in that it comprises the CDRs of sequences comprising SEQ ID NOs: 1 (QDINNY), 2 (TDYS), 3 (YTS), 4 (IDPYNGGT), 5 (LQYDNLWT) and 6 (QTDYFDY).