Abstract: Disclosed is a method for delivery of an anti-cancer agent into a cell expressing the OAcGD2 ganglioside by using an antibody recognizing the OAcGD2 ganglioside.

Abstract: Disclosed is an antibody, functional fragment, and derivative thereof, which binds specifically to the OAcGD2 ganglioside, the antibody including i) a humanized light chain variable region (VL) polypeptide having the amino acid sequence SEQ id no 112; and ii) a humanized heavy chain variable region (VH) having the amino acid sequence SEQ id no 76; and its use in diagnostics and therapy.

Abstract: An antibody recognizing the O-acetylated-GD2 ganglioside for the treatment of Cancer Stem Cells (CSC) cancer, a pharmaceutical composition including the antibody for treating a CSC cancer and a method for treating a CSC cancer in a patient in need thereof, the method including administering the antibody to the patient. A method for diagnosing a CSC, the use of the O-acetylated-GD2 ganglioside as a biomarker of CSC cancer, and a method for predicting the response of a subject affected with CSC cancer to a treatment with the antibody or the composition are also described.

Abstract: A method for increasing the therapeutic efficacy of a human immunoglobulin G class 1 (IgG1) antibody, includes: mutating the human CH1?1 domain from the antibody, to restore the pairing between CH1 and CL domains that is typical of the other IgG subclasses, or by substituting the human CH1?1 domain by the CH1 domain from a human IgG2 (CH1?2), IgG3 (CH1?3) or IgG4 (CH1?4); the antibody obtained by such method, includes a) a light chain including the following amino acid sequences: i) the Light Chain Variable Region (LCVR) specific from an antigen; and ii) a human kappa (?)Constant (CL) domain; and b) a heavy chain including the following amino acid sequences: i) the Heavy Chain Variable Region (HCVR) specific from the antigen; ii) the CH2 and CH3 domains from a human IgG1; and iii) the CH1 domain from a human IgG1, mutated to restore pairing between CHI and CL domains.

Abstract: Antibody which binds to the O-acetylated-GD2 ganglioside, includes: a) a light chain including three light chain complementary regions (CDRs) having the following amino acid sequences: CDR1: QSLLKNNGNTFL (SEQ id no 1), CDR2: KVS, CDR3: SQSTHIPYT (SEQ id no 2); and a light chain framework sequence from an immunoglobulin light chain, including the human kappa (?)CL domain; and b) a heavy chain including three heavy chain complementary regions (CDRs) having the following amino acid sequences: CDR1: EFTFTDYY (SEQ id no 3), CDR2: IRNRANGYTT (SEQ id no 4), CDR3: ARVSNWAFDY (SEQ id no 5), and a heavy chain framework sequence from an immunoglobulin heavy chain, including CH2 and CH3 domains from a human IgG1, and a CH1 domain from a human IgG1, which is mutated to restore pairing between CH1 and light chain that is typical of other human IgG subclasses or substituted by a CH1 domain from such non-IgG1 subclasses as human IgG2, IgG3 or IgG4.

Abstract: Disclosed is an antibody, functional fragment, and derivative thereof, which binds specifically to the OAcGD2 ganglioside, the antibody including i) a humanized light chain variable region (VL) polypeptide having the amino acid sequence SEQ id no 112; and ii) a humanized heavy chain variable region (VH) having the amino acid sequence SEQ id no 76; and its use in diagnostics and therapy.

Abstract: An antibody recognizing the O-acetylated-GD2 ganglioside for the treatment of Cancer Stem Cells (CSC) cancer, a pharmaceutical composition including the antibody for treating a CSC cancer and a method for treating a CSC cancer in a patient in need thereof, the method including administering the antibody to the patient. A method for diagnosing a CSC, the use of the O-acetylated-GD2 ganglioside as a biomarker of CSC cancer, and a method for predicting the response of a subject affected with CSC cancer to a treatment with the antibody or the composition are also described.