New derivatives of cephalosporin for treating cancer

A method for treating a cancer, comprising administering an effective amount of a compound of formula (I):

• wherein:
• R1 represents:
• a hydrogen atom, or
• a —CO—R4 unit or a —CO2—R4 unit wherein R4 represents a radical (C1-C10)alkyl, (C2-C10)alkylene, (C3-C14)cycloalkyl, heterocycloalkyl, aryl, heteroaryl, (C1-C6)alkyl-(C3-C14)cycloalkyl, (C1-C6)alkyl-heterocycloalkyl, (C1-C6)alkyl-(C3-C14)cycloalkyloxy, (C1-C6)alkyl-heterocycloalkyl oxy, (C1-C6)alkyl-aryl, (C1-C6)alkyl-aryloxy, (C1-C6)alkyl-heteroaryl, or (C1-C6)alkyl-heteroaryloxy, said radicals being optionally substituted by at least one (C1-C6)alkyl group, one hydroxy group, one ketone, one (C1-C6)alkoxy group, one carboxylic acid group eventually substituted by a (C1-C6)alkyl group, one —NR5R6 unit wherein R5 and R6 represent a hydrogen atom or a (C1-C6)alkyl group, one halogen atom, one cyano group, or one nitro group;
• R2 represents a hydrogen atom or a (C1-C6)alkyl chain;
• and
• R3 represents a hydrogen atom, or a (C1-C6)alkyl chain, or (C2-C6)alkylene, said chains being optionally substituted by at least one (C1-C6)alkyl group, one hydroxy group, one —O—CO—(C1-C6)alkyl unit, one ketone, one carboxylic acid group eventually substituted by a (C1-C6)alkyl group, one —NR5R6 unit wherein R5 and R6 represent H or a (C1-C6)alkyl group, one halogen atom, one cyano group or one nitro group;
• or one of its pharmaceutically acceptable salts, in a subject in need thereof.